## 计算机代写|Java代写|A Closer Look at Variables

Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。

statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 计算机代写|Java代写|Initializing a Variable

Variables were introduced in Chapter 1. Here, we will take a closer look at them. As you learned earlier, variables are declared using this form of statement,
type var-name;
where type is the data type of the variable, and var-name is its name. You can declare a variable of any valid type, including the simple types just described, and every variable will have a type. Thus, the capabilities of a variable are determined by its type. For example, a variable of type boolean cannot be used to store floating-point values. Furthermore, the type of a variable cannot change during its lifetime. An int variable cannot turn into a char variable, for example.
All variables in Java must be declared prior to their use. This is necessary because the compiler must know what type of data a variable contains before it can properly compile any statement that uses the variable. It also enables Java to perform strict type checking.

In general, you must give a variable a value prior to using it. One way to give a variable a value is through an assignment statement, as you have already seen. Another way is by giving it an initial value when it is declared. To do this, follow the variable’s name with an equal sign and the value being assigned. The general form of initialization is shown here:
type var = value;
Here, value is the value that is given to var when var is created. The value must be compatible with the specified type. Here are some examples:
int count $=10 ; / /$ give count an initial value of char ch $=\mathrm{X}^{\prime} ; / /$ initialize ch with the letter $\mathrm{X}$ float $\mathrm{f}=1.2 \mathrm{~F} ; / / \mathrm{f}$ is initialized with $1.2$
When declaring two or more variables of the same type using a comma-separated list, you can give one or more of those variables an initial value. For example:
int $a, b=8, c=19, d ; / / b$ and $c$ have initializations
In this case, only $\mathbf{b}$ and $\mathbf{c}$ are initialized.

## 计算机代写|Java代写|Dynamic Initialization

Although the preceding examples have used only constants as initializers, Java allows variables to be initialized dynamically, using any expression valid at the time the variable is declared. For example, here is a short program that computes the volume of a cylinder given the radius of its base and its height:
// Demonstrate dynamic initialization.
class DynInit {
public static void main(String[] args) {
double radius $=4$, height $=5$; volume is dynamically initialized at run time.
$/ /$ dynamically initialize volume
double volume $=3.1416$ * radius * radius * height;
Although the preceding examples have used only constants as initializers, Java allows variables
to be initialized dynamically, using any expression valid at the time the variable is declared.
For example, here is a short program that computes the volume of a cylinder given the radius
of its base and its height:
// Demonstrate dynamic initialization.
class DynInit {
public static void main (String [] args) double radius $=4$, height $=5$; volume is dynamically initialized at run time.
// dynamically initialize volume
double volume $=3.1416$ radius * radius * height;
System.out.println(“Volume is ” + volume);
System.out.println(“Volume is ” + volume);
}
}
Here, three local variables – radius, height, and volume – are declared. The first two, radius and height, are initialized by constants. However, volume is initialized dynamically to the volume of the cylinder. The key point here is that the initialization expression can use any element valid at the time of the initialization, including calls to methods, other variables, or literals.

## 计算机代写|Java代写|The Scope and Lifetime of Variables

So far, all of the variables that we have been using were declared at the start of the main( ) method. However, Java allows variables to be declared within any block. As explained in Chapter 1, a block is begun with an opening curly brace and ended by a closing curly brace. A block defines a scope. Thus, each time you start a new block, you are creating a new scope. A scope determines what objects are visible to other parts of your program. It also determines the lifetime of those objects.
In general, every declaration in Java has a scope. As a result, Java defines a powerful, finely grained concept of scope. Two of the most common scopes in Java are those defined by a class and those defined by a method. A discussion of class scope (and variables declared within it) is deferred until later in this book, when classes are described. For now, we will examine only the scopes defined by or within a method.

The scope defined by a method begins with its opening curly brace. However, if that method has parameters, they too are included within the method’s scope. A method’s scope ends with its closing curly brace. This block of code is called the method body.

As a general rule, variables declared inside a scope are not visible (that is, accessible) to code that is defined outside that scope. Thus, when you declare a variable within a scope, you are localizing that variable and protecting it from unauthorized access and/or modification.
Indeed, the scope rules provide the foundation for encapsulation. A variable declared within a block is called a local variable.

Scopes can be nested. For example, each time you create a block of code, you are creating a new, nested scope. When this occurs, the outer scope encloses the inner scope. This means

that objects declared in the outer scope will be visible to code within the inner scope. However, the reverse is not true. Objects declared within the inner scope will not be visible outside it. To understand the effect of nested scopes, consider the following program:
$/ /$ Demonstrate block scope.
class scopedemo {
public static void main (string [] args) {
int $x_{i} / /$ known to all code within main
$x=10 ;$
if $(x==10) \quad{/ /$ start new scope
int $y=20 ; / /$ known only to this block
$/ / x$ and $y$ both known here.
system.out. println (” $x$ and $y: \prime+x+=\prime+y)$;
$x=y * 2$;
}
$/ / y=100 ; / /$ Error! y not known here ←_Here, $y$ is outside of its scope.
$/ / \mathrm{x}$ is still known here.
System. out. println( $” x$ is ” $+x)$;
}
}

## 计算机代写|Java代写|Initializing a Variable

Java 中的所有变量都必须在使用前声明。这是必要的，因为编译器必须知道变量包含什么类型的数据，然后才能正确编译使用该变量的任何语句。它还使 Java 能够执行严格的类型检查。

type var = value;

int count=10;//给 count 一个初始值 char ch=X′;//用字母初始化 chX漂浮F=1.2 F;//F初始化为1.2

## 计算机代写|Java代写|Dynamic Initialization

// 演示动态初始化。

public static void main(String[] args) {

//动态初始化音量

// 演示动态初始化。

public static void main (String [] args) 双半径=4， 高度=5; 卷在运行时动态初始化。
// 动态初始化音量

System.out.println(“音量为” + 音量);
System.out.println(“音量为” + 音量);
}
}

## 计算机代写|Java代写|The Scope and Lifetime of Variables

//演示块范围。

public static void main (string [] args) {
intX一世//main 中的所有代码都知道
X=10;

}
}

## 有限元方法代写

tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

## 计算机代写|Java代写|Introducing Data Types and Operators

Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。

statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 计算机代写|Java代写|The Boolean Type

The boolean type represents true/false values. Java defines the values true and false using the reserved words true and false. Thus, a variable or expression of type boolean will be one of these two values.
Here is a program that demonstrates the boolean type:
// Demonstrate boolean values.
class Booldemo {
public static void main(String[] args) {
boolean $\mathrm{b}$;
$b=$ false $;$
system.out.println(“b is ” $+$ b);
$\mathrm{b}=$ true;
System.out.println(“b is ” + b);
$/ /$ a boolean value can control the if statement
if (b) system. out. println(“This is executed.”);
$b=$ false;
if (b) System.out.println(“This is not executed.”);
// outcome of a relational operator is a boolean value
System.out.println(” $10>9$ is ” $+(10>9))$;
}
}
The output generated by this program is shown here:
$b$ is false
$b$ is true
This is executed.
$10>9$ is true

There are three interesting things to notice about this program. First, as you can see, when a boolean value is output by println( ), “true” or “false” is displayed. Second, the value of a boolean variable is sufficient, by itself, to control the if statement. There is no need to write an if statement like this:
if $(b==$ true $) \ldots$
Third, the outcome of a relational operator, such as $<$, is a boolean value. This is why the expression $10>9$ displays the value “true.” Further, the extra set of parentheses around $\mathbf{1 0}>\mathbf{9}$ is necessary because the + operator has a higher precedence than the $>$.

## 计算机代写|Java代写|Literals

In Java, literals refer to fixed values that are represented in their human-readable form. For example, the number 100 is a literal. Literals are also commonly called constants. For the most part, literals, and their usage, are so intuitive that they have been used in one form or another by all the preceding sample programs. Now the time has come to explain them formally.
Java literals can be of any of the primitive data types. The way each literal is represented depends upon its type. As explained earlier, character constants are enclosed in single quotes. For example, ‘a’ and ‘ $\%$ ‘ are both character constants.
Integer literals are specified as numbers without fractional components. For example, 10 and $-100$ are integer literals. Floating-point literals require the use of the decimal point followed by the number’s fractional component. For example, $11.123$ is a floating-point literal. Java also allows you to use scientific notation for floating-point numbers.

By default, integer literals are of type int. If you want to specify a long literal, append an 1 or an L. For example, 12 is an int, but $12 \mathrm{~L}$ is a long.

By default, floating-point literals are of type double. To specify a float literal, append an F or $\mathrm{f}$ to the constant. For example, 10.19F is of type float.

Although integer literals create an int value by default, they can still be assigned to variables of type char, byte, or short as long as the value being assigned can be represented by the target type. An integer literal can always be assigned to a long variable.

You can embed one or more underscores into an integer or floating-point literal. Doing so can make it easier to read values consisting of many digits. When the literal is compiled, the underscores are simply discarded. Here is an example:
123_45_1234
This specifies the value $123,451,234$. The use of underscores is particularly useful when encoding things like part numbers, customer IDs, and status codes that are commonly thought of as consisting of subgroups of digits.

## 计算机代写|Java代写|Hexadecimal, Octal, and Binary Literals

As you may know, in programming it is sometimes easier to use a number system based on 8 or 16 instead of 10 . The number system based on 8 is called octal, and it uses the digits 0 through 7. In octal the number 10 is the same as 8 in decimal. The base 16 number system is called hexadecimal and uses the digits 0 through 9 plus the letters $\mathrm{A}$ through $\mathrm{F}$, which stand for 10,11 , $12,13,14$, and 15. For example, the hexadecimal number 10 is 16 in decimal. Because of the frequency with which these two number systems are used, Java allows you to specify integer literals in hexadecimal or octal instead of decimal. A hexadecimal literal must begin with $\mathbf{0 x}$ or $\mathbf{0 X}$ (a zero followed by an $\mathbf{x}$ or $\mathrm{X}$ ). An octal literal begins with a zero. Here are some examples:
hex $=0 \mathrm{XFF} ; / / 255$ in decimal
oct $=011 ; / / 9$ in decimal
hex $=0 x F F ; / / 255$ in decimal
oct $=011 ; / / 9$ in decimal
As a point of interest, Java also allows hexadecimal floating-point literals, but they are seldom used.

It is possible to specify an integer literal by use of binary. To do so, precede the binary number with a $\mathbf{0 b}$ or $\mathbf{0 B}$. For example, this specifies the value 12 in binary: $\mathbf{0 b} 1100$.

Enclosing character constants in single quotes works for most printing characters, but a few characters, such as the carriage return, pose a special problem when a text editor is used. In addition, certain other characters, such as the single and double quotes, have special meaning in Java, so you cannot use them directly. For these reasons, Java provides special escape sequences, sometimes referred to as backslash character constants, shown in Table 2-2. These sequences are used in place of the characters that they represent.

## 计算机代写|Java代写|The Boolean Type

// 演示布尔值。

public static void main(String[] args) {
booleanb;
b=错误的;
system.out.println(“b 是”+b);
b=真的;
System.out.println(“b 是” + b);
//一个布尔值可以控制 if 语句
if (b) 系统。出去。println(“执行完毕”);
b=错误的;
if (b) System.out.println(“这没有被执行。”);
// 关系运算符的结果是一个布尔值
System.out.println(”10>9是 ”+(10>9));

b是假的
b是 true

10>9是真的

if(b==真的)…

## 计算机代写|Java代写|Literals

Java 文字可以是任何原始数据类型。每个文字的表示方式取决于其类型。如前所述，字符常量用单引号括起来。例如，’a’ 和 ‘%’ 都是字符常量。

123_45_1234

_=011;//9十进制

_=011;//9以十进制

## 有限元方法代写

tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。

statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 计算机代写|Java代写|Semicolons and Positioning

In Java, the semicolon is a separator. It is often used to terminate a statement. In essence, the semicolon indicates the end of one logical entity.

As you know, a block is a set of logically connected statements that are surrounded by opening and closing braces. A block is not terminated with a semicolon. Instead, the end of the block is indicated by the closing brace.

Java does not recognize the end of the line as a terminator. For this reason, it does not matter where on a line you put a statement. For example,
\begin{aligned} &x=y ; \ &y=y+1 ; \ &\text { System. out.println }(x+n \prime+y) ; \end{aligned}
is the same as the following, to Java:
$x=y ; y=y+1 ;$ System. out. $\operatorname{print} \ln (x+\cdots \cdots+y) ;$
Furthermore, the individual elements of a statement can also be put on separate lines. For example, the following is perfectly acceptable:
system. out.println(“This is a long line of output” $+$
$x+y+z+$
System. out.println(“This is a long line of output” $+$
$x+y+z+$
“more output”);
“more output”);
Breaking long lines in this fashion is often used to make programs more readable. It can also help prevent excessively long lines from wrapping.

## 计算机代写|Java代写|Floating-Point Types

As explained in Chapter 1 , the floating-point types can represent numbers that have fractional components. There are two kinds of floating-point types, float and double, which represent single- and double-precision numbers, respectively. Type float is 32 bits wide and type double is 64 bits wide.

Of the two, double is the most commonly used, and many of the math functions in Java’s class library use double values. For example, the sqrt() method (which is defined by the standard Math class) returns a double value that is the square root of its double argument. Here, sqrt( ) is used to compute the length of the hypotenuse, given the lengths of the two opposing sides:
$/ *$
Use the Pythagorean theorem to
find the length of the hypotenuse
given the lengths of the two opposing
sides.
*
class Hypot {
public static void main(String[] args) {
double $x, y, z$;
$x=3 ;$
$y=4$; Notice how sqrt ( ) is called. It is preceded by
$z=$ Math.sgrt $\left(x * x+y^{*} y\right)$;
System.out.println(“Hypotenuse is ” $+z$ );
}
}
The output from the program is shown here:
Hypotenuse is $5.0$
One other point about the preceding example: As mentioned, sqrt( ) is a member of the standard Math class. Notice how sqrt( ) is called; it is preceded by the name Math. This is similar to the way System.out precedes println( ). Although not all standard methods are called by specifying their class name first, several are.

## 计算机代写|Java代写|Characters

In Java, characters are not 8-bit quantities like they are in many other computer languages. Instead, Java uses Unicode. Unicode defines a character set that can represent all of the characters found in all human languages. In Java, char is an unsigned 16-bit type having a range of 0 to 65,535 . The standard 8-bit ASCII character set is a subset of Unicode and ranges from 0 to 127. Thus, the ASCII characters are still valid Java characters.

A character variable can be assigned a value by enclosing the character in single quotes. For example, this assigns the variable ch the letter X:
For example, the char ch; ch $={ }^{\prime} \mathrm{X}^{\prime} ;$
You can output a char value using a println( ) statement. For example, this line outputs the value in ch:
System.out.println(“This is ch: ” $+\mathrm{ch}$ ); Since char is an unsigned 16-bit type, it is possible to perform various arithn manipulations on a char variable. For example, consider the following program:
// Character variables can be handled like integers.
// Character variables can be handled like class CharArithDemo { public static void main (string[] args) { char ch;
ch $=’ X^{\prime} ;$ System.out. println (“ch contains ” $+c h)$
ch++; // increment ch 4 A char can be incremented. System. out. println (“ch is now ” $+\mathrm{ch})$;
ch $=90 ; / /$ give ch the value $\mathrm{z}+$ System. out. println (“ch is now $”+\mathrm{ch}) ;$
}
3
The output generated by this program is shown here:
ch contains $X$ ch is now $Y$
ch is now $Z$
)
ch $=$ ‘ $\mathrm{X}$ ‘;
System. out. println “ch contains ” $+\mathrm{ch}) ;$
ch++; $/ /$ increment ch A char can be incremented.
System. out. println(“ch is now ” $+\mathrm{ch}) ;$
$\mathrm{ch}=90 ; / /$ give ch the value $\mathrm{Z}+\mathrm{ch}$; A char can be assigned an integer value.
System. out. println (“ch is now ” $+\mathrm{ch}$;
}
th
In the program, ch is first given the value $X$. Next, ch is incremented. This results in ch containing Y, the next character in the ASCII (and Unicode) sequence. Next, ch is assigned the value 90, which is the ASCII (and Unicode) value that corresponds to the letter Z. Since the ASCII character set occupies the first 127 values in the Unicode character set, all the “old tricks” that you may have used with characters in other languages will work in Java, too.

## 计算机代写|Java代写|Semicolons and Positioning

Java 不将行尾识别为终止符。出于这个原因，您在一行的哪个位置放置语句并不重要。例如，

X=是; 是=是+1;  系统。输出.println (X+n′+是);

X=是;是=是+1;系统。出去。打印⁡ln⁡(X+⋯⋯+是);

system. out.println(“这是一长串输出”+
X+是+和+

X+是+和+
“更多输出”）；
“更多输出”）；

## 计算机代写|Java代写|Floating-Point Types

/∗

X=3;

System.out.println(“斜边是 ”+和); 程序的输出如下所示：
Hypotenuse是
5.0

## 计算机代写|Java代写|Characters

System.out.println(“This is ch: ”+CH); 由于 char 是无符号的 16 位类型，因此可以对 char 变量执行各种 arithn 操作。例如，考虑以下程序：
// 字符变量可以像整数一样处理。
// 字符变量可以像 class CharArithDemo { public static void main (string[] args) { char ch;
ch=′X′;系统输出。println (“ch 包含”+CH)
ch++; // 增加 ch 4 一个字符可以增加。系统。出去。println (“现在是 ch”+CH);
ch=90;//给 ch 值和+系统。出去。println(“现在是”+CH);
3此程序生成的输出如下所示：ch
containsXch 现在是是
ch 现在是从
)

ch++;//increment ch 一个字符可以递增。

CH=90;//给 ch 值从+CH; 可以为 char 分配一个整数值。

}
th

## 有限元方法代写

tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

## 计算机代写|Java代写|Two Control Statements

Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。

statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 计算机代写|Java代写|The if Statement

You can selectively execute part of a program through the use of Java’s conditional statement: the if. The Java if statement works much like the IF statement in any other language. It determines the flow of program execution based on whether some condition is true or false. Its simplest form is shown here:
if(condition) statement;
Here, condition is a Boolean expression. (A Boolean expression is one that evaluates to either true or false.) If condition is true, then the statement is executed. If condition is false, then the statement is bypassed. Here is an example:
if $(10<11)$ System.out.println (“10 is less than 11”);
In this case, since 10 is less than 11 , the conditional expression is true, and println( ) will execute. However, consider the following:
if(10<9) system.out.println(“this won’t be displayed”);
In this case, 10 is not less than 9 . Thus, the call to println( ) will not take place.
Java defines a full complement of relational operators that may be used in a conditional expression. They are shown here:

Notice that the test for equality is the double equal sign.
Here is a program that illustrates the if statement:
$/ *$
Demonstrate the if.
Call this file IfDemo.java.

• $/$
class IfDemo {
public static void main (string [] args) {
Notice that the test for equality is the double equal sign.
Here is a program that illustrates the if statement:
$/ *$
Demonstrate the if.
Call this file IfDemo.java.
*/ass IfDemo {
public static void main (string [] args) {
int a, b, c;
a $=2$;
b $=3 ;$
if (a < b) system. out. println (“a is less than $b “)$;
int $a, b, c$;
$a=2$;
$b=3 ;$
if ( a < b) System. out. println (“a is less than b”);

## 计算机代写|Java代写|The for Loop

You can repeatedly execute a sequence of code by creating a loop. Loops are used whenever you need to perform a repetitive task because they are much simpler and easier than trying to write the same statement sequence over and over again. Java supplies a powerful assortment of loop constructs. The one we will look at here is the for loop. The simplest form of the for loop is shown here:
for(initialization; condition; iteration) statement;
In its most common form, the initialization portion of the loop sets a loop control variable to an initial value. The condition is a Boolean expression that tests the loop control variable.

If the outcome of that test is true, statement executes and the for loop continues to iterate. If it is false, the loop terminates. The iteration expression determines how the loop control variable is changed each time the loop iterates. Here is a short program that illustrates the for loop:
$/ *$
Demonstrate the for loop.
Call this file ForDemo.java.
*
class ForDemo {
public static void main(string [] args) {
int count;
for (count $=0 ;$ count $<5 ;$ count $=$ coun $t+1)+$ – his loop iterates five times.
system.out. println (“This is count: ” + count);
System. out. println (“Done!”);
1
}
The output generated by the program is shown here:
This is count: 0
This is count: 1
This is count: 2
This is count: 3
This is count: 4
Done !
In this example, count is the loop control variable. It is set to zero in the initialization portion of the for. At the start of each iteration (including the first one), the conditional test count $<\mathbf{5}$ is performed. If the outcome of this test is true, the println( ) statement is executed, and then the iteration portion of the loop is executed, which increases count by 1 . This process continues until the conditional test is false, at which point execution picks up at the bottom of the loop. As a point of interest, in professionally written Java programs, you will almost never see the iteration portion of the loop written as shown in the preceding program. That is, you will seldom see statements like this:
count $=$ count $+1$;
The reason is that Java includes a special increment operator that performs this operation more efficiently. The increment operator is $++$ (that is, two plus signs back to back). The increment operator increases its operand by one. By use of the increment operator, the preceding statement can be written like this:
count $++;$
Thus, the for in the preceding program will usually be written like this:
for (count $=0 ;$ count $<5 ;$ count $++$ )
You might want to try this. As you will see, the loop still runs exactly the same as it did before.

## 计算机代写|Java代写|Create Blocks of Code

Another key element of Java is the code block. A code block is a grouping of two or more statements. This is done by enclosing the statements between opening and closing curly braces. Once a block of code has been created, it becomes a logical unit that can be used any place that a single statement can. For example, a block can be a target for Java’s if and for statements. Consider this if statement:

Here, if $\mathbf{w}$ is less than $\mathbf{h}$, both statements inside the block will be executed. Thus, the two statements inside the block form a logical unit, and one statement cannot execute without the other also executing. The key point here is that whenever you need to logically link two or more statements, you do so by creating a block. Code blocks allow many algorithms to be implemented with greater clarity and efficiency.
Here is a program that uses a block of code to prevent a division by zero:
$/ *$
Demonstrate a block of code.

• $/$
Call this file BlockDemo.java. pubs BlockDemo { double i, j, d;
$i=5 ;$ $j=10 ;$
$/ /$ the target of this if is a block
if $(1,1=0){$
System.out.println(“i does not equal zero”); $\mathrm{d}$; The target of the if
$d=j / i ;$ system.out.println(“j/ i is $”+d) ;$
}
}
}
The output generated by this program is shown here:
i does not equal zero
$j /$ i is $2.0$

## 计算机代写|Java代写|The if Statement

if(condition) 语句；

if(10<9) system.out.println(“this won’t be displayed”);

Java 定义了可以在条件表达式中使用的完整的关系运算符。它们显示在这里：

/∗

• /
class IfDemo {
public static void main (string [] args) {
注意相等的测试是双等号。
这是一个说明 if 语句的程序：
/∗
证明如果。
调用这个文件 IfDemo.java。
*/ass IfDemo {
public static void main (string [] args) {
int a, b, c;
一个=2;
b=3;
如果 (a < b) 系统。出去。println(“a 小于b“);
整数一个,b,C;
一个=2;
b=3;
如果 (a < b) 系统。出去。println(“a 小于 b”);

## 计算机代写|Java代写|The for Loop

for(initialization;condition;iteration) 语句；

/∗

*

public static void main(string [] args) {
int count;

1
}

count=数数+1;

count++;

for (count=0;数数<5;数数++)

## 计算机代写|Java代写|Create Blocks of Code

Java 的另一个关键元素是代码块。代码块是两个或多个语句的组合。这是通过将语句括在左大括号和右大括号之间来完成的。一旦创建了一个代码块，它就会成为一个逻辑单元，可以在单个语句可以使用的任何地方使用。例如，块可以是 Java 的 if 和 for 语句的目标。考虑这个 if 语句：

/∗

• /
将此文件称为 BlockDemo.java。pubs BlockDemo { 双 i, j, d;
一世=5; j=10;
//这个 if 的目标是一个块
if(1,1=0){$System.out.println(“我不等于零”);$\mathrm{d}$; if$d=j / i ;$system.out.println(“j/ i is$”+d) ;$} } } 的目标 该程序生成的输出如下所示： i 不等于 0(1,1=0){$ System.out.println(“我不等于零”); $\mathrm{d}$; if $d=j / i ;$ system.out.println(“j/ i is $”+d) ;$ } } } 的目标 该程序生成的输出如下所示： i 不等于 0j /一世一世s2.0$统计代写请认准statistics-lab™. statistics-lab™为您的留学生涯保驾护航。 ## 金融工程代写 金融工程是使用数学技术来解决金融问题。金融工程使用计算机科学、统计学、经济学和应用数学领域的工具和知识来解决当前的金融问题，以及设计新的和创新的金融产品。 ## 非参数统计代写 非参数统计指的是一种统计方法，其中不假设数据来自于由少数参数决定的规定模型；这种模型的例子包括正态分布模型和线性回归模型。 ## 广义线性模型代考 广义线性模型（GLM）归属统计学领域，是一种应用灵活的线性回归模型。该模型允许因变量的偏差分布有除了正态分布之外的其它分布。 术语 广义线性模型（GLM）通常是指给定连续和/或分类预测因素的连续响应变量的常规线性回归模型。它包括多元线性回归，以及方差分析和方差分析（仅含固定效应）。 ## 有限元方法代写 有限元方法（FEM）是一种流行的方法，用于数值解决工程和数学建模中出现的微分方程。典型的问题领域包括结构分析、传热、流体流动、质量运输和电磁势等传统领域。 有限元是一种通用的数值方法，用于解决两个或三个空间变量的偏微分方程（即一些边界值问题）。为了解决一个问题，有限元将一个大系统细分为更小、更简单的部分，称为有限元。这是通过在空间维度上的特定空间离散化来实现的，它是通过构建对象的网格来实现的：用于求解的数值域，它有有限数量的点。边界值问题的有限元方法表述最终导致一个代数方程组。该方法在域上对未知函数进行逼近。[1] 然后将模拟这些有限元的简单方程组合成一个更大的方程系统，以模拟整个问题。然后，有限元通过变化微积分使相关的误差函数最小化来逼近一个解决方案。 tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。 ## 随机分析代写 随机微积分是数学的一个分支，对随机过程进行操作。它允许为随机过程的积分定义一个关于随机过程的一致的积分理论。这个领域是由日本数学家伊藤清在第二次世界大战期间创建并开始的。 ## 时间序列分析代写 随机过程，是依赖于参数的一组随机变量的全体，参数通常是时间。 随机变量是随机现象的数量表现，其时间序列是一组按照时间发生先后顺序进行排列的数据点序列。通常一组时间序列的时间间隔为一恒定值（如1秒，5分钟，12小时，7天，1年），因此时间序列可以作为离散时间数据进行分析处理。研究时间序列数据的意义在于现实中，往往需要研究某个事物其随时间发展变化的规律。这就需要通过研究该事物过去发展的历史记录，以得到其自身发展的规律。 ## 回归分析代写 多元回归分析渐进（Multiple Regression Analysis Asymptotics）属于计量经济学领域，主要是一种数学上的统计分析方法，可以分析复杂情况下各影响因素的数学关系，在自然科学、社会和经济学等多个领域内应用广泛。 ## MATLAB代写 MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。 ## 计算机代写|Java代写|The Java Development Kit 如果你也在 怎样代写Java这个学科遇到相关的难题，请随时右上角联系我们的24/7代写客服。 Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。 statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。 我们提供的Java及其相关学科的代写，服务范围广, 其中包括但不限于: • Statistical Inference 统计推断 • Statistical Computing 统计计算 • Advanced Probability Theory 高等概率论 • Advanced Mathematical Statistics 高等数理统计学 • (Generalized) Linear Models 广义线性模型 • Statistical Machine Learning 统计机器学习 • Longitudinal Data Analysis 纵向数据分析 • Foundations of Data Science 数据科学基础 ## 计算机代写|Java代写|The Java Development Kit Now that the theoretical underpinning of Java has been explained, it is time to start writing Java programs. Before you can compile and run those programs, you must have a Java Development Kit (JDK). At the time of this writing, the current release of the JDK is JDK 17. This is the version for Java SE 17. (SE stands for Standard Edition.) It is also the version described in this book. Because JDK 17 contains features that are not supported by earlier versions of Java, it is recommended that you use JDK 17 (or later) to compile and run the programs in this book. (Remember, because of Java’s faster release schedule, JDK feature releases are expected at six-month intervals. Thus, don’t be surprised by a JDK with a higher release number.) However, depending on the environment in which you are working, an earlier JDK may already be installed. If this is the case, then newer Java features will not be available. If you need to install the JDK on your computer, be aware that for modern versions of Java, both Oracle JDKs and open source OpenJDKs are available for download. In general, you should first find the JDK you want to use. For example, at the time of this writing, the Oracle JDK can be downloaded from www.oracle.com/java/technologies/downloads/. Also at the time of this writing, an open source version is available at jdk.java.net. Next, download the JDK of your choice and follow its instructions to install it on your computer. After you have installed the JDK, you will be able to compile and run programs. The JDK supplies two primary programs. The first is javac, which is the Java compiler. The second is java, which is the standard Java interpreter and is also referred to as the application launcher. One other point: The JDK runs in the command-prompt environment and uses command-line tools. It is not a windowed application. It is also not an integrated development environment (IDE). ## 计算机代写|Java代写|Entering the Program The programs shown in this book are available from www.mhprofessional.com. However, if you want to enter the programs by hand, you are free to do so. In this case, you must enter the program into your computer using a text editor, not a word processor. Word processors typically store format information along with text. This format information will confuse the Java compiler. If you are using a Windows platform, you can use Notepad or any other programming editor that you like. For most computer languages, the name of the file that holds the source code to a program is arbitrary. However, this is not the case with Java. The first thing that you must learn about Java is that the name you give to a source file is very important. For this example, the name of the source file should be Example.java. Let’s see why. In Java, a source file is officially called a compilation unit. It is a text file that contains (among other things) one or more class definitions. (For now, we will be using source files that contain only one class.) The Java compiler requires that a source file use the .java filename extension. As you can see by looking at the program, the name of the class defined by the program is also Example. This is not a coincidence. In Java, all code must reside inside a class. By convention, the name of the main class should match the name of the file that holds the program. You should also make sure that the capitalization of the filename matches the class name. The reason for this is that Java is case sensitive. At this point, the convention that filenames correspond to class names may seem arbitrary. However, this convention makes it easier to maintain and organize your programs. Furthermore, as you will see later in this book, in some cases, it is required. ## 计算机代写|Java代写|A Second Simple Program Perhaps no other construct is as important to a programming language as the assignment of a value to a variable. A variable is a named memory location that can be assigned a value. Further, the value of a variable can be changed during the execution of a program. That is, the content of a variable is changeable, not fixed. The following program creates two variables called myVar1 and myVar2:$/ *$This demonstrates a variable. Call this file Example2.java. •$/$class Example2 { public static void main(string [] args) { int myVarl; // this declares a variable 4-Declare variables. int myVar2;$/ /$this declares another variable myVarl =$1024 ; / /$this assigns 1024 to myVarl – Assign a variable a value. System.out. println (“myVarl contains ” + myVarl);$m y \operatorname{Var} 2=m y \operatorname{Var} 1 / 2 ;$System. out. print (“myVar2 contains myVar1/2:”); System. out. println (myVar2); ) } When you run this program, you will see the following output: myVarl contains 1024 myVar2 contains myVarl/$/ 2: 512$This program introduces several new concepts. First, the statement int myvarl; // this declares a variable declares a variable called myVar1 of type integer. In Java, all variables must be declared before they are used. Further, the type of values that the variable can hold must also be specified. This is called the type of the variable. In this case, myVar1 can hold integer values. These are whole number values. In Java, to declare a variable to be of type integer, precede its name with the keyword int. Thus, the preceding statement declares a variable called myVar1 of type int. ## Java代考 ## 计算机代写|Java代写|The Java Development Kit 现在已经解释了 Java 的理论基础，是时候开始编写 Java 程序了。在编译和运行这些程序之前，您必须拥有 Java 开发工具包 (JDK)。在撰写本文时，JDK 的当前版本是 JDK 17。这是 Java SE 17 的版本。（SE 代表 Standard Edition。）这也是本书中描述的版本。由于 JDK 17 包含早期 Java 版本不支持的功能，因此建议您使用 JDK 17（或更高版本）来编译和运行本书中的程序。（请记住，由于 Java 的发布计划更快，JDK 功能的发布间隔预计为 6 个月。因此，不要对具有更高版本号的 JDK 感到惊讶。）但是，根据您工作的环境，可能已经安装了较早的 JDK。 如果您需要在计算机上安装 JDK，请注意，对于现代版本的 Java，Oracle JDK 和开源 OpenJDK 都可供下载。一般来说，您应该首先找到您要使用的JDK。例如，在撰写本文时，可以从 www.oracle.com/java/technologies/downloads/ 下载 Oracle JDK。在撰写本文时，jdk.java.net 上还提供了一个开源版本。接下来，下载您选择的 JDK 并按照其说明将其安装到您的计算机上。安装 JDK 后，您将能够编译和运行程序。 JDK 提供了两个主要程序。第一个是 javac，它是 Java 编译器。第二个是java，它是标准的Java解释器，也被称为应用程序启动器。另一点：JDK 在命令提示符环境中运行，并使用命令行工具。它不是一个窗口应用程序。它也不是集成开发环境 (IDE)。 ## 计算机代写|Java代写|Entering the Program 本书中显示的程序可从 www.mhprofessional.com 获得。但是，如果您想手动输入程序，您可以随意这样做。在这种情况下，您必须使用文本编辑器而不是文字处理器将程序输入计算机。文字处理器通常将格式信息与文本一起存储。这种格式信息会混淆 Java 编译器。如果您使用的是 Windows 平台，则可以使用记事本或任何其他您喜欢的编程编辑器。 对于大多数计算机语言，保存程序源代码的文件的名称是任意的。但是，Java 并非如此。您必须了解 Java 的第一件事是您为源文件命名的名称非常重要。对于此示例，源文件的名称应为 Example.java。让我们看看为什么。 在 Java 中，源文件正式称为编译单元。它是一个包含（除其他外）一个或多个类定义的文本文件。（现在，我们将使用只包含一个类的源文件。）Java 编译器要求源文件使用 .java 文件扩展名。看程序可以看出，程序定义的类的名字也是Example。这不是巧合。在 Java 中，所有代码都必须驻留在类中。按照惯例，主类的名称应该与保存程序的文件的名称相匹配。您还应该确保文件名的大写与类名匹配。原因是 Java 区分大小写。在这一点上，文件名对应于类名的约定似乎是任意的。然而，这种约定使您更容易维护和组织您的程序。此外，正如您将在本书后面看到的那样，在某些情况下，它是必需的。 ## 计算机代写|Java代写|A Second Simple Program 对编程语言来说，也许没有其他结构比为变量赋值更重要了。变量是可以赋值的命名内存位置。此外，变量的值可以在程序执行期间改变。也就是说，变量的内容是可变的，而不是固定的。下面的程序创建了两个变量 myVar1 和 myVar2： /∗ 这演示了一个变量。 将此文件称为 Example2.java。 • / 类 Example2 { public static void main(string [] args) { int myVarl; // 这声明了一个变量 4-Declare variables. 诠释 myVar2;//这声明了另一个变量 myVarl =1024;//这将 1024 分配给 myVarl – 为变量赋值。 系统输出。println (“myVarl 包含” + myVarl); 米是曾是⁡2=米是曾是⁡1/2; 系统。出去。打印（“myVar2 包含 myVar1/2:”）； 系统。出去。println (myVar2); ) } 当你运行这个程序时，你会看到如下输出： myVarl contains 1024 myVar2 contains myVarl//2:512 该程序引入了几个新概念。一、声明 int myvarl；// 这声明了一个变量 ，声明了一个名为 myVar1 的整数类型的变量。在 Java 中，所有变量都必须在使用前声明。此外，还必须指定变量可以保存的值的类型。这称为变量的类型。在这种情况下，myVar1 可以保存整数值。这些是整数值。在 Java 中，要将变量声明为整数类型，请在其名称前加上关键字 int。因此，前面的语句声明了一个名为 myVar1 的 int 类型变量。 统计代写请认准statistics-lab™. statistics-lab™为您的留学生涯保驾护航。 ## 金融工程代写 金融工程是使用数学技术来解决金融问题。金融工程使用计算机科学、统计学、经济学和应用数学领域的工具和知识来解决当前的金融问题，以及设计新的和创新的金融产品。 ## 非参数统计代写 非参数统计指的是一种统计方法，其中不假设数据来自于由少数参数决定的规定模型；这种模型的例子包括正态分布模型和线性回归模型。 ## 广义线性模型代考 广义线性模型（GLM）归属统计学领域，是一种应用灵活的线性回归模型。该模型允许因变量的偏差分布有除了正态分布之外的其它分布。 术语 广义线性模型（GLM）通常是指给定连续和/或分类预测因素的连续响应变量的常规线性回归模型。它包括多元线性回归，以及方差分析和方差分析（仅含固定效应）。 ## 有限元方法代写 有限元方法（FEM）是一种流行的方法，用于数值解决工程和数学建模中出现的微分方程。典型的问题领域包括结构分析、传热、流体流动、质量运输和电磁势等传统领域。 有限元是一种通用的数值方法，用于解决两个或三个空间变量的偏微分方程（即一些边界值问题）。为了解决一个问题，有限元将一个大系统细分为更小、更简单的部分，称为有限元。这是通过在空间维度上的特定空间离散化来实现的，它是通过构建对象的网格来实现的：用于求解的数值域，它有有限数量的点。边界值问题的有限元方法表述最终导致一个代数方程组。该方法在域上对未知函数进行逼近。[1] 然后将模拟这些有限元的简单方程组合成一个更大的方程系统，以模拟整个问题。然后，有限元通过变化微积分使相关的误差函数最小化来逼近一个解决方案。 tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。 ## 随机分析代写 随机微积分是数学的一个分支，对随机过程进行操作。它允许为随机过程的积分定义一个关于随机过程的一致的积分理论。这个领域是由日本数学家伊藤清在第二次世界大战期间创建并开始的。 ## 时间序列分析代写 随机过程，是依赖于参数的一组随机变量的全体，参数通常是时间。 随机变量是随机现象的数量表现，其时间序列是一组按照时间发生先后顺序进行排列的数据点序列。通常一组时间序列的时间间隔为一恒定值（如1秒，5分钟，12小时，7天，1年），因此时间序列可以作为离散时间数据进行分析处理。研究时间序列数据的意义在于现实中，往往需要研究某个事物其随时间发展变化的规律。这就需要通过研究该事物过去发展的历史记录，以得到其自身发展的规律。 ## 回归分析代写 多元回归分析渐进（Multiple Regression Analysis Asymptotics）属于计量经济学领域，主要是一种数学上的统计分析方法，可以分析复杂情况下各影响因素的数学关系，在自然科学、社会和经济学等多个领域内应用广泛。 ## MATLAB代写 MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。 ## 计算机代写|Java代写|Object-Oriented Programming 如果你也在 怎样代写Java这个学科遇到相关的难题，请随时右上角联系我们的24/7代写客服。 Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。 statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。 我们提供的Java及其相关学科的代写，服务范围广, 其中包括但不限于: • Statistical Inference 统计推断 • Statistical Computing 统计计算 • Advanced Probability Theory 高等概率论 • Advanced Mathematical Statistics 高等数理统计学 • (Generalized) Linear Models 广义线性模型 • Statistical Machine Learning 统计机器学习 • Longitudinal Data Analysis 纵向数据分析 • Foundations of Data Science 数据科学基础 ## 计算机代写|Java代写|Object-Oriented Programming At the center of Java is object-oriented programming (OOP). The object-oriented methodology is inseparable from Java, and all Java programs are, to at least some extent, object-oriented. Because of OOP’s importance to Java, it is useful to understand in a general way OOP’s basic principles before you write even a simple Java program. Later in this book, you will see how to put these concepts into practice. OOP is a powerful way to approach the job of programming. Programming methodologies have changed dramatically since the invention of the computer, primarily to accommodate the increasing complexity of programs. For example, when computers were first invented, programming was done by toggling in the binary machine instructions using the computer’s front panel. As long as programs were just a few hundred instructions long, this approach worked. As programs grew, assembly language was invented so that a programmer could deal with larger, increasingly complex programs, using symbolic representations of the machine instructions. As programs continued to grow, high-level languages were introduced that gave the programmer more tools with which to handle complexity. The first widespread language was, of course, FORTRAN. Although FORTRAN was a very impressive first step, it was hardly a language that encouraged clear, easy-to-understand programs. The 1960 s gave birth to structured programming. This is the method encouraged by languages such as$\mathrm{C}$and Pascal. The use of structured languages made it possible to write moderately complex programs fairly easily. Structured languages are characterized by their support for stand-alone subroutines, local variables, rich control constructs, and their lack of reliance upon the GOTO. Although structured languages are a powerful tool, even they reach their limit when a project becomes too large. Consider this: At each milestone in the development of programming, techniques and tools were created to allow the programmer to deal with increasingly greater complexity. Each step of the way, the new approach took the best elements of the previous methods and moved forward. Prior to the invention of OOP, many projects were nearing (or exceeding) the point where the structured approach no longer works. Object-oriented methods were created to help programmers break through these barriers. Object-oriented programming took the best ideas of structured programming and combined them with several new concepts. The result was a different way of organizing a program. In the most general sense, a program can be organized in one of two ways: around its code (what is happening) or around its data (what is being affected). Using only structured programming techniques, programs are typically organized around code. This approach can be thought of as “code acting on data.” Object-oriented programs work the other way around. They are organized around data, with the key principle being “data controlling access to code.” In an object-oriented language, you define the data and the routines that are permitted to act on that data. Thus, a data type defines precisely what sort of operations can be applied to that data. To support the principles of object-oriented programming, all OOP languages, including Java, have three traits in common: encapsulation, polymorphism, and inheritance. Let’s examine each. ## 计算机代写|Java代写|Encapsulation Encapsulation is a programming mechanism that binds together code and the data it manipulates, and that keeps both safe from outside interference and misuse. In an objectoriented language, code and data can be bound together in such a way that a self-contained black box is created. Within the box are all necessary data and code. When code and data are linked together in this fashion, an object is created. In other words, an object is the device that supports encapsulation. Within an object, code, data, or both may be private to that object or public. Private code or data is known to and accessible by only another part of the object. That is, private code or data cannot be accessed by a piece of the program that exists outside the object. When code or data is public, other parts of your program can access it even though it is defined within an object. Typically, the public parts of an object are used to provide a controlled interface to the private elements of the object. Java’s basic unit of encapsulation is the class. Although the class will be examined in great detail later in this book, the following brief discussion will be helpful now. A class defines the form of an object. It specifies both the data and the code that will operate on that data. Java uses a class specification to construct objects. Objects are instances of a class. Thus, a class is essentially a set of plans that specify how to build an object. The code and data that constitute a class are called members of the class. Specifically, the data defined by the class are referred to as member variables or instance variables. The code that operates on that data is referred to as member methods or just methods. Method is Java’s term for a subroutine. If you are familiar with$\mathrm{C} / \mathrm{C}++$, it may help to know that what a Java programmer calls a method, a C/C++ programmer calls a function. ## 计算机代写|Java代写|Polymorphism Polymorphism (from Greek, meaning “many forms”) is the quality that allows one interface to access a general class of actions. The specific action is determined by the exact nature of the situation. A simple example of polymorphism is found in the steering wheel of an automobile. The steering wheel (i.e., the interface) is the same no matter what type of actual steering mechanism is used. That is, the steering wheel works the same whether your car has manual steering, power steering, or rack-and-pinion steering. Therefore, once you know how to operate the steering wheel, you can drive any type of car. The same principle can also apply to programming. For example, consider a stack (which is a first-in, last-out list). You might have a program that requires three different types of stacks. One stack is used for integer values, one for floating-point values, and one for characters. In this case, the algorithm that implements each stack is the same, even though the data being stored differs. In a non-object-oriented language, you would be required to create three different sets of stack routines, with each set using different names. However, because of polymorphism, in Java you can create one general set of stack routines that works for all three specific situations. This way, once you know how to use one stack, you can use them all. More generally, the concept of polymorphism is often expressed by the phrase “one interface, multiple methods.” This means that it is possible to design a generic interface to a group of related activities. Polymorphism helps reduce complexity by allowing the same interface to be used to specify a general class of action. It is the compiler’s job to select the specific action (i.e., method) as it applies to each situation. You, the programmer, don’t need to do this selection manually. You need only remember and utilize the general interface. ## Java代考 ## 计算机代写|Java代写|Object-Oriented Programming Java 的核心是面向对象编程 (OOP)。面向对象的方法与 Java 密不可分，所有的 Java 程序至少在一定程度上都是面向对象的。由于 OOP 对 Java 的重要性，在编写简单的 Java 程序之前，以一般方式理解 OOP 的基本原理很有用。在本书的后面部分，您将看到如何将这些概念付诸实践。 OOP 是处理编程工作的一种强大方法。自计算机发明以来，编程方法发生了巨大变化，主要是为了适应程序日益复杂的问题。例如，当计算机首次发明时，编程是通过使用计算机的前面板切换二进制机器指令来完成的。只要程序只有几百条指令，这种方法就可以奏效。随着程序的发展，发明了汇编语言，以便程序员可以使用机器指令的符号表示来处理更大、越来越复杂的程序。随着程序的不断发展，引入了高级语言，为程序员提供了更多工具来处理复杂性。第一种广泛使用的语言当然是 FORTRAN。 1960 年代诞生了结构化编程。这是语言鼓励的方法，例如C和帕斯卡。结构化语言的使用使得编写中等复杂的程序变得相当容易。结构化语言的特点是支持独立的子程序、局部变量、丰富的控制结构，并且不依赖 GOTO。尽管结构化语言是一种强大的工具，但当项目变得太大时，它们也会达到极限。 考虑一下：在编程开发的每个里程碑中，都会创建技术和工具以允许程序员处理越来越复杂的问题。每一步，新方法都吸收了以前方法的最佳元素并向前推进。在 OOP 发明之前，许多项目已经接近（或超过）结构化方法不再起作用的地步。创建了面向对象的方法来帮助程序员突破这些障碍。 面向对象编程吸收了结构化编程的最佳思想，并将它们与几个新概念结合起来。结果是组织程序的不同方式。在最一般的意义上，一个程序可以通过以下两种方式之一进行组织：围绕它的代码（正在发生的事情）或围绕它的数据（什么受到影响）。仅使用结构化编程技术，程序通常围绕代码组织。这种方法可以被认为是“作用于数据的代码”。 面向对象的程序以相反的方式工作。它们是围绕数据组织的，关键原则是“数据控制对代码的访问”。在面向对象的语言中，您定义数据和允许对该数据进行操作的例程。因此，数据类型精确地定义了可以对该数据应用何种操作。 为了支持面向对象编程的原则，包括 Java 在内的所有 OOP 语言都具有三个共同特征：封装、多态和继承。让我们逐一检查。 ## 计算机代写|Java代写|Encapsulation 封装是一种编程机制，它将代码和它操作的数据绑定在一起，并且可以保护两者免受外部干扰和误用。在面向对象的语言中，代码和数据可以通过创建自包含黑盒的方式绑定在一起。框内是所有必要的数据和代码。当代码和数据以这种方式链接在一起时，就会创建一个对象。换句话说，对象是支持封装的设备。 在一个对象中，代码、数据或两者可能是该对象私有的或公共的。私有代码或数据仅由对象的另一部分知道和可访问。也就是说，私有代码或数据不能被存在于对象之外的一段程序访问。当代码或数据是公开的时，即使它是在对象中定义的，程序的其他部分也可以访问它。通常，对象的公共部分用于为对象的私有元素提供受控接口。 Java 的基本封装单元是类。尽管本书后面会详细讨论该类，但下面的简短讨论现在会有所帮助。类定义对象的形式。它指定了数据和将对该数据进行操作的代码。Java 使用类规范来构造对象。对象是类的实例。因此，类本质上是一组指定如何构建对象的计划。 构成类的代码和数据称为类的成员。具体来说，类定义的数据称为成员变量或实例变量。对该数据进行操作的代码称为成员方法或仅称为方法。方法是 Java 对子例程的术语。如果你熟悉C/C++，了解 Java 程序员调用方法、C/C++ 程序员调用函数可能会有所帮助。 ## 计算机代写|Java代写|Polymorphism 多态性（来自希腊语，意思是“多种形式”）是允许一个接口访问一类通用动作的特性。具体行动由情况的确切性质决定。多态性的一个简单例子是在汽车的方向盘上。无论使用何种类型的实际转向机构，方向盘（即界面）都是相同的。也就是说，无论您的汽车是手动转向、动力转向还是齿轮齿条转向，方向盘的工作原理都是一样的。因此，一旦您知道如何操作方向盘，您就可以驾驶任何类型的汽车。 同样的原则也适用于编程。例如，考虑一个堆栈（这是一个先进后出的列表）。您可能有一个程序需要三种不同类型的堆栈。一个堆栈用于整数值，一个用于浮点值，一个用于字符。在这种情况下，实现每个堆栈的算法是相同的，即使存储的数据不同。在非面向对象的语言中，您需要创建三组不同的堆栈例程，每组使用不同的名称。但是，由于多态性，在 Java 中，您可以创建一组通用的堆栈例程，适用于所有三种特定情况。这样，一旦你知道如何使用一个堆栈，你就可以全部使用它们。 更一般地说，多态性的概念通常用“一个接口，多个方法”这一短语来表达。这意味着可以为一组相关活动设计通用接口。多态性通过允许使用相同的接口来指定一般的动作类别来帮助降低复杂性。选择适用于每种情况的特定操作（即方法）是编译器的工作。您，程序员，不需要手动进行此选择。您只需要记住并使用通用界面。 统计代写请认准statistics-lab™. statistics-lab™为您的留学生涯保驾护航。 ## 金融工程代写 金融工程是使用数学技术来解决金融问题。金融工程使用计算机科学、统计学、经济学和应用数学领域的工具和知识来解决当前的金融问题，以及设计新的和创新的金融产品。 ## 非参数统计代写 非参数统计指的是一种统计方法，其中不假设数据来自于由少数参数决定的规定模型；这种模型的例子包括正态分布模型和线性回归模型。 ## 广义线性模型代考 广义线性模型（GLM）归属统计学领域，是一种应用灵活的线性回归模型。该模型允许因变量的偏差分布有除了正态分布之外的其它分布。 术语 广义线性模型（GLM）通常是指给定连续和/或分类预测因素的连续响应变量的常规线性回归模型。它包括多元线性回归，以及方差分析和方差分析（仅含固定效应）。 ## 有限元方法代写 有限元方法（FEM）是一种流行的方法，用于数值解决工程和数学建模中出现的微分方程。典型的问题领域包括结构分析、传热、流体流动、质量运输和电磁势等传统领域。 有限元是一种通用的数值方法，用于解决两个或三个空间变量的偏微分方程（即一些边界值问题）。为了解决一个问题，有限元将一个大系统细分为更小、更简单的部分，称为有限元。这是通过在空间维度上的特定空间离散化来实现的，它是通过构建对象的网格来实现的：用于求解的数值域，它有有限数量的点。边界值问题的有限元方法表述最终导致一个代数方程组。该方法在域上对未知函数进行逼近。[1] 然后将模拟这些有限元的简单方程组合成一个更大的方程系统，以模拟整个问题。然后，有限元通过变化微积分使相关的误差函数最小化来逼近一个解决方案。 tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。 ## 随机分析代写 随机微积分是数学的一个分支，对随机过程进行操作。它允许为随机过程的积分定义一个关于随机过程的一致的积分理论。这个领域是由日本数学家伊藤清在第二次世界大战期间创建并开始的。 ## 时间序列分析代写 随机过程，是依赖于参数的一组随机变量的全体，参数通常是时间。 随机变量是随机现象的数量表现，其时间序列是一组按照时间发生先后顺序进行排列的数据点序列。通常一组时间序列的时间间隔为一恒定值（如1秒，5分钟，12小时，7天，1年），因此时间序列可以作为离散时间数据进行分析处理。研究时间序列数据的意义在于现实中，往往需要研究某个事物其随时间发展变化的规律。这就需要通过研究该事物过去发展的历史记录，以得到其自身发展的规律。 ## 回归分析代写 多元回归分析渐进（Multiple Regression Analysis Asymptotics）属于计量经济学领域，主要是一种数学上的统计分析方法，可以分析复杂情况下各影响因素的数学关系，在自然科学、社会和经济学等多个领域内应用广泛。 ## MATLAB代写 MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。 ## 计算机代写|Java代写|Java’s Magic: The Bytecode 如果你也在 怎样代写Java这个学科遇到相关的难题，请随时右上角联系我们的24/7代写客服。 Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。 statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。 我们提供的Java及其相关学科的代写，服务范围广, 其中包括但不限于: • Statistical Inference 统计推断 • Statistical Computing 统计计算 • Advanced Probability Theory 高等概率论 • Advanced Mathematical Statistics 高等数理统计学 • (Generalized) Linear Models 广义线性模型 • Statistical Machine Learning 统计机器学习 • Longitudinal Data Analysis 纵向数据分析 • Foundations of Data Science 数据科学基础 ## 计算机代写|Java代写|Java’s Magic: The Bytecode The key that allowed Java to address both the security and the portability problems just described is that the output of a Java compiler is not executable code. Rather, it is bytecode. Bytecode is a highly optimized set of instructions designed to be executed by what is called the Java Virtual Machine (JVM), which is part of the Java Runtime Environment (JRE). In essence, the original JVM was designed as an interpreter for bytecode. This may come as a bit of a surprise because many modern languages are designed to be compiled into CPU-specific, executable code due to performance concerns. However, the fact that a Java program is executed by the JVM helps solve the major problems associated with web-based programs. Here is why. Translating a Java program into bytecode makes it much easier to run a program in a wide variety of environments because only the JRE (which includes the JVM) needs to be implemented for each platform. Once a JRE exists for a given system, any Java program can run on it. Remember, although the details of the JRE will differ from platform to platform, all JREs understand the same Java bytecode. If a Java program were compiled to native code, then different versions of the same program would have to exist for each type of CPU connected to the Internet. This is, of course, not a feasible solution. Thus, the execution of bytecode by the JVM is the easiest way to create truly portable programs. The fact that a Java program is executed by the JVM also helps to make it secure. Because the JVM is in control, it manages program execution. Thus, it was possible for the JVM to create a restricted execution environment, called the sandbox, that contains the program, preventing unrestricted access to the machine. Safety is also enhanced by certain restrictions that exist in the Java language. When a program is interpreted, it generally runs slower than the same program would run if compiled to executable code. However, with Java, the differential between the two is not so great. Because bytecode has been highly optimized, the use of bytecode enables the JVM to execute programs much faster than you might expect. Although Java was designed as an interpreted language, there is nothing about Java that prevents on-the-fly compilation of bytecode into native code in order to boost performance. For this reason, the HotSpot JVM was introduced not long after Java’s initial release. HotSpot includes a just-in-time (JIT) compiler for bytecode. When a JIT compiler is part of the JVM, selected portions of bytecode are compiled into executable code in real time on a piece-bypiece demand basis. That is, a JIT compiler compiles code as it is needed during execution. Furthermore, not all sequences of bytecode are compiled-only those that will benefit from compilation. The remaining code is simply interpreted. However, the just-in-time approach still yields a significant performance boost. Even when dynamic compilation is applied to bytecode, the portability and safety features still apply because the JVM is still in charge of the execution environment. One other point: There has been experimentation with an ahead-of-time compiler for Java. Such a compiler can be used to compile bytecode into native code prior to execution by the JVM, rather than on-the-fly. Some previous versions of the JDK supplied an experimental ahead-of-time compiler; however, JDK 17 has removed it. Ahead-of-time compilation is a specialized feature and it does not replace Java’s traditional approach just described. Because of the highly sophisticated nature of ahead-of-time compilation, it is not something that you will use when learning Java, and it is not discussed further in this book. ## 计算机代写|Java代写|Moving Beyond Applets At the time of this writing, it has been more than two decades since Java’s original release. Over those years, many changes have taken place. At the time of Java’s creation, the Internet was a new and exciting innovation; web browsers were undergoing rapid development and refinement; the modern form of the smartphone had not yet been invented; and the near ubiquitous use of computers was still a few years off. As you would expect, Java has also changed and so, too, has the way that Java is used. Perhaps nothing illustrates the ongoing evolution of Java better than the applet. As explained previously, in the early years of Java, applets were a crucial part of Java programming. They not only added excitement to a web page, they were a highly visible part of Java, which added to its charisma. However, applets rely on a Java browser plug-in. Thus, for an applet to work, it must be supported by the browser. Over the past few years support for the Java browser plug-in has been waning. Simply put, without browser support, applets are not viable. Because of this, beginning with JDK 9 , the phase-out of applets was begun, with support for applets being deprecated. In the language of Java, deprecated means that a feature is still available but flagged as obsolete. Thus, a deprecated feature should not be used for new code. The phase-out became complete with the release of JDK 11 because run-time support for applets was removed. Beginning with JDK 17, the entire Applet API was deprecated for removal, which means that it will be removed from the JDK at some point in the future. As a point of interest, a few years after Java’s creation an alternative to applets was added. Called Java Web Start, it enabled an application to be dynamically downloaded from a web page. It was a deployment mechanism that was especially useful for larger Java applications that were not appropriate for applets. The difference between an applet and a Web Start application is that a Web Start application runs on its own, not inside the browser. Thus, it looks much like a “normal” application. It does, however, require that a stand-alone JRE that supports Web Start is available on the host system. Beginning with JDK 11, support for Java Web Start has been removed. Given that neither applets nor Java Web Start are viable options for modern versions of Java, you might wonder what mechanism should be used to deploy a Java application. At the time of this writing, one part of the answer is to use the jlink tool added by JDK 9. It can create a complete run-time image that includes all necessary support for your program, including the JRE. Another part of the answer is the jpackage tool. Added by JDK 16, it can be used to create a ready-to-install application. As you might guess, deployment is a rather advanced topic that is outside the scope of this book. Fortunately, you won’t need to worry about deployment to use this book because all of the sample programs run directly on your computer. They are not deployed over the Internet. ## 计算机代写|Java代写|A Faster Release Schedule Not long ago, another major change occurred in Java, but it does not involve changes to the language or the run-time environment. Rather, it relates to the way that Java releases are scheduled. In the past, major Java releases were typically separated by two or more years. However, subsequent to the release of JDK 9, the time between major Java releases has been decreased. Today, it is anticipated that a major release will occur on a strict time-based schedule, with the expected time between major releases being just six months. Each major release, now called a feature release, will include those features ready at the time of the release. This increased release cadence enables new features and enhancements to be available to Java programmers in a timely fashion. Furthermore, it allows Java to respond quickly to the demands of an ever-changing programming environment. Simply put, the faster release schedule promises to be a very positive development for Java programmers. At three-year intervals it is anticipated that a long-term support (LTS) release will take place. An LTS release will be supported (and thus remain viable) for a period of time longer than six months. The first LTS release was JDK 11. The second LTS release was JDK 17, for which this book has been updated. Because of the stability that an LTS release offers, it is likely that its feature-set will define a baseline of functionality for a number of years. Consult Oracle for the latest information concerning long-term support and the LTS release schedule. Currently, feature releases are scheduled for March and September of each year. As a result, JDK 10 was released in March 2018, which was six months after the release of JDK 9. The next release (JDK 11) was in September 2018. It was an LTS release. This was followed by JDK 12 In March 2019, JDK 13 in September 2019, and so on. At the time of this writing, the latest release is JDK 17, which is an LTS release. Again, it is anticipated that every six months a new feature release will take place. Of course, you will want to consult the latest release schedule information. At the time of this writing, there are a number of new Java features on the horizon. Because of the faster release schedule, it is very likely that several of them will be added to Java over the next few years. You will want to review the information and release notes provided by each sixmonth release in detail. It is truly an exciting time to be a Java programmer! ## Java代考 ## 计算机代写|Java代写|Java’s Magic: The Bytecode 使 Java 能够解决刚才描述的安全性和可移植性问题的关键是 Java 编译器的输出不是可执行代码。相反，它是字节码。字节码是一组高度优化的指令，旨在由所谓的 Java 虚拟机 (JVM) 执行，它是 Java 运行时环境 (JRE) 的一部分。本质上，最初的 JVM 被设计为字节码的解释器。这可能有点令人惊讶，因为出于性能考虑，许多现代语言被设计为编译为特定于 CPU 的可执行代码。然而，Java 程序由 JVM 执行这一事实有助于解决与基于 Web 的程序相关的主要问题。这就是为什么。 将 Java 程序转换为字节码可以更轻松地在各种环境中运行程序，因为每个平台只需要实现 JRE（包括 JVM）。一旦给定系统存在 JRE，任何 Java 程序都可以在其上运行。请记住，尽管 JRE 的详细信息会因平台而异，但所有 JRE 都理解相同的 Java 字节码。如果 Java 程序被编译为本机代码，那么 对于连接到 Internet 的每种类型的 CPU，必须存在同一程序的不同版本。当然，这不是一个可行的解决方案。因此，JVM 执行字节码是创建真正可移植程序的最简单方法。 Java 程序由 JVM 执行的事实也有助于使其安全。因为 JVM 处于控制之中，所以它管理程序执行。因此，JVM 可以创建一个包含程序的受限执行环境（称为沙箱），从而防止对机器的无限制访问。Java 语言中存在的某些限制也增强了安全性。 当一个程序被解释时，它的运行速度通常比同一个程序编译成可执行代码时的运行速度要慢。但是，对于 Java，两者之间的差异并没有那么大。因为字节码已经高度优化，使用字节码使 JVM 执行程序的速度比您预期的要快得多。 尽管 Java 被设计为一种解释性语言，但 Java 并没有阻止将字节码动态编译为本机代码以提高性能。出于这个原因，HotSpot JVM 是在 Java 最初发布后不久推出的。HotSpot 包括一个用于字节码的即时 (JIT) 编译器。当 JIT 编译器是 JVM 的一部分时，字节码的选定部分会根据需要实时编译为可执行代码。也就是说，JIT 编译器在执行期间根据需要编译代码。此外，并非所有字节码序列都被编译——只有那些将从编译中受益的序列。剩下的代码被简单地解释。但是，即时方法仍然可以显着提高性能。即使将动态编译应用于字节码， 还有一点：已经对 Java 的提前编译器进行了试验。这样的编译器可用于在 JVM 执行之前将字节码编译为本机代码，而不是即时编译。JDK 的一些早期版本提供了一个实验性的提前编译器；但是，JDK 17 已将其删除。提前编译是一项专门的功能，它不会取代刚刚描述的 Java 的传统方法。由于提前编译的高度复杂性，它不是你在学习 Java 时会用到的东西，本书也不会进一步讨论它。 ## 计算机代写|Java代写|Moving Beyond Applets 在撰写本文时，距离 Java 最初的发布已经过去了二十多年。这些年，发生了很多变化。在 Java 创建的时候，Internet 是一项新的、令人兴奋的创新。网络浏览器正在快速发展和完善；智能手机的现代形式尚未发明；计算机几乎无处不在的使用还需要几年的时间。正如您所料，Java 也发生了变化，Java 的使用方式也发生了变化。也许没有什么比小程序更能说明 Java 的持续发展了。 如前所述，在 Java 的早期，applet 是 Java 编程的关键部分。它们不仅为网页增添了兴奋感，而且是 Java 的一个高度可见的部分，这增加了它的魅力。但是，applet 依赖于 Java 浏览器插件。因此，要使小程序工作，它必须得到浏览器的支持。在过去几年中，对 Java 浏览器插件的支持一直在减弱。简单地说，没有浏览器支持，applet 是不可行的。正因为如此，从 JDK 9 开始，applet 的逐步淘汰开始，对 applet 的支持被弃用。在 Java 语言中，deprecated 意味着某个功能仍然可用，但被标记为已过时。因此，不推荐使用的功能不应用于新代码。由于删除了对小程序的运行时支持，因此随着 JDK 11 的发布而逐步淘汰。 有趣的是，在 Java 创建几年后，添加了一个小程序的替代方案。称为 Java Web Start，它使应用程序能够从网页动态下载。这是一种部署机制，对于不适合 applet 的大型 Java 应用程序特别有用。applet 和 Web Start 应用程序之间的区别在于，Web Start 应用程序独立运行，而不是在浏览器内运行。因此，它看起来很像一个“正常”的应用程序。但是，它要求主机系统上有一个支持 Web Start 的独立 JRE。从 JDK 11 开始，已删除对 Java Web Start 的支持。 鉴于 applet 和 Java Web Start 都不是现代 Java 版本的可行选项，您可能想知道应该使用什么机制来部署 Java 应用程序。在撰写本文时，部分答案是使用 JDK 9 添加的 jlink 工具。它可以创建一个完整的运行时映像，其中包括对您的程序的所有必要支持，包括 JRE。答案的另一部分是 jpackage 工具。由 JDK 16 添加，可用于创建可立即安装的应用程序。正如您可能猜到的那样，部署是一个相当高级的主题，超出了本书的范围。幸运的是，您无需担心部署即可使用本书，因为所有示例程序都直接在您的计算机上运行。它们没有部署在 Internet 上。 ## 计算机代写|Java代写|A Faster Release Schedule 不久前，Java 发生了另一次重大变化，但它不涉及语言或运行时环境的变化。相反，它与 Java 发布的计划方式有关。过去，主要的 Java 版本通常相隔两年或更长时间。但是，在 JDK 9 发布之后，主要 Java 版本之间的时间缩短了。今天，预计主要版本将按照严格的时间安排发布，预计主要版本之间的时间仅为六个月。 每个主要版本，现在称为功能版本，都将包含在发布时准备好的功能。这种增加的发布节奏使 Java 程序员能够及时地使用新功能和增强功能。此外，它还允许 Java 快速响应不断变化的编程环境的需求。简而言之，更快的发布计划对 Java 程序员来说是一个非常积极的发展。 预计将每隔三年发布一次长期支持 (LTS) 版本。LTS 版本将在超过六个月的时间内得到支持（因此仍然可行）。第一个 LTS 版本是 JDK 11。第二个 LTS 版本是 JDK 17，本书对此进行了更新。由于 LTS 版本提供的稳定性，它的功能集很可能会定义多年的功能基线。有关长期支持和 LTS 发布计划的最新信息，请咨询 Oracle。 目前，功能发布计划在每年的 3 月和 9 月发布。结果，JDK 10 于 2018 年 3 月发布，比 JDK 9 发布时间晚了六个月。下一个版本（JDK 11）是在 2018 年 9 月。它是一个 LTS 版本。紧随其后的是 2019 年 3 月的 JDK 12，2019 年 9 月的 JDK 13，依此类推。在撰写本文时，最新版本是 JDK 17，它是一个 LTS 版本。同样，预计每六个月将发布一次新功能。当然，您需要查阅最新的发布时间表信息。 在撰写本文时，有许多新的 Java 特性即将出现。由于更快的发布计划，很可能在接下来的几年中，其中有几个会被添加到 Java 中。您需要详细查看每个六个月版本提供的信息和版本说明。成为一名 Java 程序员真的是一个激动人心的时刻！ 统计代写请认准statistics-lab™. statistics-lab™为您的留学生涯保驾护航。 ## 金融工程代写 金融工程是使用数学技术来解决金融问题。金融工程使用计算机科学、统计学、经济学和应用数学领域的工具和知识来解决当前的金融问题，以及设计新的和创新的金融产品。 ## 非参数统计代写 非参数统计指的是一种统计方法，其中不假设数据来自于由少数参数决定的规定模型；这种模型的例子包括正态分布模型和线性回归模型。 ## 广义线性模型代考 广义线性模型（GLM）归属统计学领域，是一种应用灵活的线性回归模型。该模型允许因变量的偏差分布有除了正态分布之外的其它分布。 术语 广义线性模型（GLM）通常是指给定连续和/或分类预测因素的连续响应变量的常规线性回归模型。它包括多元线性回归，以及方差分析和方差分析（仅含固定效应）。 ## 有限元方法代写 有限元方法（FEM）是一种流行的方法，用于数值解决工程和数学建模中出现的微分方程。典型的问题领域包括结构分析、传热、流体流动、质量运输和电磁势等传统领域。 有限元是一种通用的数值方法，用于解决两个或三个空间变量的偏微分方程（即一些边界值问题）。为了解决一个问题，有限元将一个大系统细分为更小、更简单的部分，称为有限元。这是通过在空间维度上的特定空间离散化来实现的，它是通过构建对象的网格来实现的：用于求解的数值域，它有有限数量的点。边界值问题的有限元方法表述最终导致一个代数方程组。该方法在域上对未知函数进行逼近。[1] 然后将模拟这些有限元的简单方程组合成一个更大的方程系统，以模拟整个问题。然后，有限元通过变化微积分使相关的误差函数最小化来逼近一个解决方案。 tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。 ## 随机分析代写 随机微积分是数学的一个分支，对随机过程进行操作。它允许为随机过程的积分定义一个关于随机过程的一致的积分理论。这个领域是由日本数学家伊藤清在第二次世界大战期间创建并开始的。 ## 时间序列分析代写 随机过程，是依赖于参数的一组随机变量的全体，参数通常是时间。 随机变量是随机现象的数量表现，其时间序列是一组按照时间发生先后顺序进行排列的数据点序列。通常一组时间序列的时间间隔为一恒定值（如1秒，5分钟，12小时，7天，1年），因此时间序列可以作为离散时间数据进行分析处理。研究时间序列数据的意义在于现实中，往往需要研究某个事物其随时间发展变化的规律。这就需要通过研究该事物过去发展的历史记录，以得到其自身发展的规律。 ## 回归分析代写 多元回归分析渐进（Multiple Regression Analysis Asymptotics）属于计量经济学领域，主要是一种数学上的统计分析方法，可以分析复杂情况下各影响因素的数学关系，在自然科学、社会和经济学等多个领域内应用广泛。 ## MATLAB代写 MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。 ## 计算机代写|Java代写|Java’s Lineage: C and C++ 如果你也在 怎样代写Java这个学科遇到相关的难题，请随时右上角联系我们的24/7代写客服。 Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。 statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。 我们提供的Java及其相关学科的代写，服务范围广, 其中包括但不限于: • Statistical Inference 统计推断 • Statistical Computing 统计计算 • Advanced Probability Theory 高等概率论 • Advanced Mathematical Statistics 高等数理统计学 • (Generalized) Linear Models 广义线性模型 • Statistical Machine Learning 统计机器学习 • Longitudinal Data Analysis 纵向数据分析 • Foundations of Data Science 数据科学基础 ## 计算机代写|Java代写|Java’s Lineage: C and C++ The history of computer languages is not one of isolated events. Rather, it is a continuum in which each new language is influenced in one way or another by what has come before. In this regard, Java is no exception. Before moving on, it is useful to understand where Java fits into the family tree of computer languages. The two languages that form Java’s closest ancestors are$\mathrm{C}$and$\mathrm{C}++$. As you may know,$\mathrm{C}$and$\mathrm{C}++$are among the most important computer languages ever invented and are still in widespread use today. From C, Java inherits its syntax. Java’s object model is adapted from$\mathrm{C}++$. Java’s relationship to$\mathrm{C}$and$\mathrm{C}++$is important for a number of reasons. First, at the time of Java’s creation, many programmers were familiar with the$\mathrm{C} / \mathrm{C}++$syntax. Because Java uses a similar syntax, it was relatively easy for a$\mathrm{C} / \mathrm{C}++$programmer to learn Java. This made it possible for Java to be readily utilized by the pool of existing programmers, thus facilitating Java’s acceptance by the programming community. Second, Java’s designers did not “reinvent the wheel.” Instead, they further refined an already highly successful programming paradigm. The modern age of programming began with$\mathrm{C}$. It moved to$\mathrm{C}++$and then to Java. By inheriting and building on that rich heritage, Java provides a powerful, logically consistent programming environment that takes the best of the past and adds new features related to the online environment and advances in the art of programming. Perhaps most important, because of their similarities, C, C++, and Java define a common, conceptual framework for the professional programmer. Programmers do not face major rifts when switching from one language to another. Java has another attribute in common with$\mathrm{C}$and$\mathrm{C}++$: it was designed, tested, and refined by real working programmers. It is a language grounded in the needs and experiences of the people who devised it. There is no better way to produce a top-flight professional programming language. One last point: although$\mathrm{C}++$and Java are related, especially in their support for objectoriented programming, Java is not simply the “Internet version of C++.” Java has significant practical and philosophical differences from$\mathrm{C}++$. Furthermore, Java is not an enhanced version of$\mathrm{C}++$. For example, it is neither upwardly nor downwardly compatible with$\mathrm{C}++$. Moreover, Java was not designed to replace$\mathrm{C}++$. Java was designed to solve a certain set of problems.$\mathrm{C}++$was designed to solve a different set of problems. They will coexist for many years to come. ## 计算机代写|Java代写|How Java Impacted the Internet The Internet helped catapult Java to the forefront of programming, and Java, in turn, had a profound effect on the Internet. First, the creation of Java simplified Internet programming in general, acting as a catalyst that drew legions of programmers to the Web. Second, Java innovated a new type of networked program called the applet that changed the way the online world thought about content. Finally, and perhaps most importantly, Java addressed some of the thorniest issues associated with the Internet: portability and security. From the start, Java simplified web-based programming in a number of ways. Arguably the most important is found in its ability to create portable, cross-platform programs. Of nearly equal importance is Java’s support for networking. Its library of ready-to-use functionality enabled programmers to easily write programs that accessed or made use of the Internet. It also provided mechanisms that enabled programs to be readily delivered over the Internet. Although the details are beyond the scope of this book, it is sufficient to know that Java’s support for networking was a key factor in its rapid rise. ## 计算机代写|Java代写|Java Applets At the time of Java’s creation, one of its most exciting features was the applet. An applet is a special kind of Java program that is designed to be transmitted over the Internet and automatically executed inside a Java-compatible web browser. If the user clicks a link that contains an applet, the applet will download and run in the browser automatically. Applets were intended to be small programs, typically used to display data provided by the server, handle user input, or provide simple functions, such as a loan calculator. The key feature of applets is that they execute locally, rather than on the server. In essence, the applet allowed some functionality to be moved from the server to the client. The creation of the applet was important because, at the time, it expanded the universe of objects that could move about freely in cyberspace. In general, there are two very broad categories of objects that are transmitted between the server and the client: passive information and dynamic active programs. For example, when you read your e-mail, you are viewing passive data. Even when you download a program, the program’s code is still only passive data until you execute it. By contrast, the applet is a dynamic, self-executing program. Such a program is an active agent on the client computer, yet it is delivered by the server. In the early days of Java, applets were a crucial part of Java programming. They illustrated the power and benefits of Java, added an exciting dimension to web pages, and enabled programmers to explore the full extent of what was possible with Java. Although it is likely that there are still applets in use today, over time they became less important, and for reasons that will be explained shortly, JDK 9 began their phase-out process. Finally, applet support was removed by JDK$11 .$## Java代考 ## 计算机代写|Java代写|Java’s Lineage: C and C++ 计算机语言的历史并不是孤立事件之一。相反，它是一个连续统一体，其中每一种新语言都以一种或另一种方式受到以前的影响。在这方面，Java 也不例外。在继续之前，了解 Java 在计算机语言家族树中的位置很有用。 形成 Java 最接近祖先的两种语言是C和C++. 如你所知，C和C++是有史以来最重要的计算机语言之一，至今仍在广泛使用。Java 从 C 继承了它的语法。Java的对象模型改编自C++. Java 的关系C和C++很重要，原因有很多。首先，在 Java 创建的时候，很多程序员都熟悉C/C++句法。因为 Java 使用类似的语法，所以对于C/C++程序员学习Java。这使得 Java 可以很容易地被现有的程序员群体使用，从而促进 Java 被编程社区接受。 其次，Java 的设计者并没有“重新发明轮子”。相反，他们进一步完善了已经非常成功的编程范式。现代编程时代始于C. 它搬到了C++然后到Java。通过继承和构建这些丰富的传统，Java 提供了一个强大的、逻辑一致的编程环境，它吸收了过去的精华，并添加了与在线环境和编程艺术进步相关的新特性。也许最重要的是，由于它们的相似性，C、C++ 和 Java 为专业程序员定义了一个通用的概念框架。程序员在从一种语言切换到另一种语言时不会面临重大分歧。 Java 有另一个共同的属性C和C++：它是由真正的工作程序员设计、测试和改进的。它是一种基于设计它的人的需求和经验的语言。没有更好的方法来制作一流的专业编程语言。 最后一点：虽然C++和 Java 是相关的，特别是在它们对面向对象编程的支持方面，Java 并不是简单的“C++ 的互联网版本”。Java 在实践和哲学上与C++. 此外，Java 不是C++. 例如，它既不向上也不向下兼容C++. 此外，Java 并非旨在取代C++. Java 旨在解决某些问题。C++旨在解决一系列不同的问题。它们将在未来许多年共存。 ## 计算机代写|Java代写|How Java Impacted the Internet 互联网帮助 Java 推到了编程的前沿，而 Java 反过来又对互联网产生了深远的影响。首先，Java 的创建总体上简化了 Internet 编程，起到了将大量程序员吸引到 Web 的催化剂的作用。其次，Java 创新了一种名为 applet 的新型网络程序，它改变了在线世界对内容的看法。最后，也许也是最重要的一点，Java 解决了与 Internet 相关的一些最棘手的问题：可移植性和安全性。 从一开始，Java 就以多种方式简化了基于 Web 的编程。可以说，最重要的是它能够创建可移植的跨平台程序。Java 对网络的支持几乎同样重要。它的即用型功能库使程序员能够轻松编写访问或使用 Internet 的程序。它还提供了使程序能够通过 Internet 轻松交付的机制。尽管细节超出了本书的范围，但只要知道 Java 对网络的支持是其迅速崛起的关键因素就足够了。 ## 计算机代写|Java代写|Java Applets 在创建 Java 时，它最令人兴奋的特性之一是小程序。小程序是一种特殊的 Java 程序，旨在通过 Internet 传输并在与 Java 兼容的 Web 浏览器中自动执行。如果用户单击包含小程序的链接，小程序将自动下载并在浏览器中运行。Applet 旨在成为小程序，通常用于显示服务器提供的数据、处理用户输入或提供简单的功能，例如贷款计算器。小程序的关键特性是它们在本地执行，而不是在服务器上执行。本质上，applet 允许将一些功能从服务器转移到客户端。 小程序的创建很重要，因为在当时，它扩展了可以在网络空间中自由移动的对象的世界。一般来说，在服务器和客户端之间传输的对象有两大类：被动信息和动态主动程序。例如，当您阅读电子邮件时，您正在查看被动数据。即使你下载了一个程序，程序的代码在你执行之前仍然只是被动数据。相比之下，applet 是一个动态的、自动执行的程序。这样的程序是客户端计算机上的一个活动代理，但它是由服务器提供的。 在 Java 的早期，applet 是 Java 编程的关键部分。他们展示了 Java 的强大功能和优势，为网页添加了令人兴奋的维度，并使程序员能够探索 Java 的全部可能性。尽管今天很可能仍有小程序在使用，但随着时间的推移，它们变得不那么重要了，出于稍后将解释的原因，JDK 9 开始了它们的淘汰过程。最后，JDK 移除了对小程序的支持11. 统计代写请认准statistics-lab™. statistics-lab™为您的留学生涯保驾护航。 ## 金融工程代写 金融工程是使用数学技术来解决金融问题。金融工程使用计算机科学、统计学、经济学和应用数学领域的工具和知识来解决当前的金融问题，以及设计新的和创新的金融产品。 ## 非参数统计代写 非参数统计指的是一种统计方法，其中不假设数据来自于由少数参数决定的规定模型；这种模型的例子包括正态分布模型和线性回归模型。 ## 广义线性模型代考 广义线性模型（GLM）归属统计学领域，是一种应用灵活的线性回归模型。该模型允许因变量的偏差分布有除了正态分布之外的其它分布。 术语 广义线性模型（GLM）通常是指给定连续和/或分类预测因素的连续响应变量的常规线性回归模型。它包括多元线性回归，以及方差分析和方差分析（仅含固定效应）。 ## 有限元方法代写 有限元方法（FEM）是一种流行的方法，用于数值解决工程和数学建模中出现的微分方程。典型的问题领域包括结构分析、传热、流体流动、质量运输和电磁势等传统领域。 有限元是一种通用的数值方法，用于解决两个或三个空间变量的偏微分方程（即一些边界值问题）。为了解决一个问题，有限元将一个大系统细分为更小、更简单的部分，称为有限元。这是通过在空间维度上的特定空间离散化来实现的，它是通过构建对象的网格来实现的：用于求解的数值域，它有有限数量的点。边界值问题的有限元方法表述最终导致一个代数方程组。该方法在域上对未知函数进行逼近。[1] 然后将模拟这些有限元的简单方程组合成一个更大的方程系统，以模拟整个问题。然后，有限元通过变化微积分使相关的误差函数最小化来逼近一个解决方案。 tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。 ## 随机分析代写 随机微积分是数学的一个分支，对随机过程进行操作。它允许为随机过程的积分定义一个关于随机过程的一致的积分理论。这个领域是由日本数学家伊藤清在第二次世界大战期间创建并开始的。 ## 时间序列分析代写 随机过程，是依赖于参数的一组随机变量的全体，参数通常是时间。 随机变量是随机现象的数量表现，其时间序列是一组按照时间发生先后顺序进行排列的数据点序列。通常一组时间序列的时间间隔为一恒定值（如1秒，5分钟，12小时，7天，1年），因此时间序列可以作为离散时间数据进行分析处理。研究时间序列数据的意义在于现实中，往往需要研究某个事物其随时间发展变化的规律。这就需要通过研究该事物过去发展的历史记录，以得到其自身发展的规律。 ## 回归分析代写 多元回归分析渐进（Multiple Regression Analysis Asymptotics）属于计量经济学领域，主要是一种数学上的统计分析方法，可以分析复杂情况下各影响因素的数学关系，在自然科学、社会和经济学等多个领域内应用广泛。 ## MATLAB代写 MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。 ## 计算机代写|Java代写|The Evolution of Java 如果你也在 怎样代写Java这个学科遇到相关的难题，请随时右上角联系我们的24/7代写客服。 Java是一种广泛使用的计算机编程语言，拥有跨平台、面向对象、泛型编程的特性，广泛应用于企业级Web应用开发和移动应用开发。 statistics-lab™ 为您的留学生涯保驾护航 在代写Java方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写Java代写方面经验极为丰富，各种代写Java相关的作业也就用不着说。 我们提供的Java及其相关学科的代写，服务范围广, 其中包括但不限于: • Statistical Inference 统计推断 • Statistical Computing 统计计算 • Advanced Probability Theory 高等概率论 • Advanced Mathematical Statistics 高等数理统计学 • (Generalized) Linear Models 广义线性模型 • Statistical Machine Learning 统计机器学习 • Longitudinal Data Analysis 纵向数据分析 • Foundations of Data Science 数据科学基础 ## 计算机代写|Java代写|The Evolution of Java Only a few languages have fundamentally reshaped the very essence of programming. In this elite group, one stands out because its impact was both rapid and widespread. This language is, of course, Java. It is not an overstatement to say that the original release of Java$1.0$in 1995 by Sun Microsystems, Inc., caused a revolution in programming. This revolution radically transformed the Web into a highly interactive environment. In the process, Java set a new standard in computer language design. Over the years, Java has continued to grow, evolve, and otherwise redefine itself. Unlike many other languages, which are slow to incorporate new features, Java has often been at the forefront of computer language development. One reason for this is the culture of innovation and change that came to surround Java. As a result, Java has gone through several upgradessome relatively small, others more significant. The first major update to Java was version 1.1. The features added by Java$1.1$were more substantial than the increase in the minor revision number would have you think. For example, Java$1.1$added many new library elements, redefined the way events are handled, and reconfigured many features of the original$1.0$library. The next major release of Java was Java 2, where the 2 indicates “second generation.” The creation of Java 2 was a watershed event, marking the beginning of Java’s “modern age.” The first release of Java 2 carried the version number 1.2. It may seem odd that the first release of Java 2 used the$1.2$version number. The reason is that it originally referred to the internal version number of the Java libraries but then was generalized to refer to the entire release itself. With Java 2, Sun repackaged the Java product as J2SE (Java 2 Platform Standard Edition), and the version numbers began to be applied to that product. The next upgrade of Java was J2SE 1.3. This version of Java was the first major upgrade to the original Java 2 release. For the most part, it added to existing functionality and “tightened up” the development environment. The release of J2SE$1.4$further enhanced Java. This release contained several important new features, including chained exceptions, channel-based I/O, and the assert keyword. ## 计算机代写|Java代写|Key Skills & Concepts n computing, few technologies have had the impact of Java. Its creation in the early days of the Web helped shape the modern form of the Internet, including both the client and server sides. Its innovative features advanced the art and science of programming, setting a new standard in computer language design. The forward-thinking culture that grew up around Java ensured it would remain vibrant and alive, adapting to the often rapid and varied changes in the computing landscape. Simply put: not only is Java one of the world’s most important computer languages, it is a force that revolutionized programming and, in the process, changed the world. Although Java is a language often associated with Internet programming, it is by no means limited in that regard. Java is a powerful, full-featured, general-purpose programming language. Thus, if you are new to programming, Java is an excellent language to learn. Moreover, to be a professional programmer today implies the ability to program in Java-it is that important. In the course of this book, you will learn the basic skills that will help you master it. The purpose of this chapter is to introduce you to Java, beginning with its history, its design philosophy, and several of its most important features. By far, the hardest thing about learning a programming language is the fact that no element exists in isolation. Instead, the components of the language work in conjunction with each other. This interrelatedness is especially pronounced in Java. In fact, it is difficult to discuss one aspect of Java without involving others. To help overcome this problem, this chapter provides a brief overview of several Java features, including the general form of a Java program, some basic control structures, and simple operators. It does not go into too many details, but, rather, concentrates on general concepts common to any Java program. ## 计算机代写|Java代写|The Origins of Java Java was conceived by James Gosling, Patrick Naughton, Chris Warth, Ed Frank, and Mike Sheridan at Sun Microsystems in 1991 . This language was initially called “Oak” but was renamed “Java” in 1995 . Somewhat surprisingly, the original impetus for Java was not the Internet! Instead, the primary motivation was the need for a platform-independent language that could be used to create software to be embedded in various consumer electronic devices, such as toasters, microwave ovens, and remote controls. As you can probably guess, many different types of CPUs are used as controllers. The trouble was that (at the time) most computer languages were designed to be compiled into machine code that was targeted for a specific type of CPU. For example, consider the$\mathrm{C}++$language. Although it was possible to compile a$\mathrm{C}++$program for just about any type of CPU, to do so required a full$\mathrm{C}++\$ compiler targeted for that CPU. The problem, however, is that compilers are expensive and time consuming to create. In an attempt to find a better solution, Gosling and the others worked on a portable, cross-platform language that could produce code that would run on a variety of CPUs under differing environments. This effort ultimately led to the creation of Java.
About the time that the details of Java were being worked out, a second, and ultimately more important, factor emerged that would play a crucial role in the future of Java. This second force was, of course, the World Wide Web. Had the Web not taken shape at about the same time that Java was being implemented, Java might have remained a useful but obscure language for programming consumer electronics. However, with the emergence of the Web, Java was propelled to the forefront of computer language design, because the Web, too, demanded portable programs.
Most programmers learn early in their careers that portable programs are as elusive as they are desirable. While the quest for a way to create efficient, portable (platform-independent) programs is nearly as old as the discipline of programming itself, it had taken a back seat to other, more pressing problems. However, with the advent of the Internet and the Web, the old problem of portability returned with a vengeance. After all, the Internet consisted of a diverse, distributed universe populated with many types of computers, operating systems, and CPUs.
What was once an irritating but low-priority problem had become a high-profile necessity. By 1993 it became obvious to members of the Java design team that the problems of portability frequently encountered when creating code for embedded controllers are also found when attempting to create code for the Internet. This realization caused the focus of Java to switch from consumer electronics to Internet programming. So, although it was the desire for an architecture-neutral programming language that provided the initial spark, it was the Internet that ultimately led to Java’s large-scale success.

## 计算机代写|Java代写|The Evolution of Java

Java 的第一个主要更新是 1.1 版。Java添加的功能1.1比您认为的次要修订号的增加要大得多。例如，Java1.1添加了许多新的库元素，重新定义了处理事件的方式，并重新配置了原始库的许多功能1.0图书馆。

Java 的下一个主要版本是 Java 2，其中 2 表示“第二代”。Java 2 的创建是一个分水岭事件，标志着 Java “现代时代”的开始。Java 2 的第一个版本带有版本号 1.2。Java 2 的第一个版本使用1.2版本号。原因是它最初是指 Java 库的内部版本号，但后来被概括为指整个版本本身。在 Java 2 中，Sun 将 Java 产品重新打包为 J2SE（Java 2 平台标准版），并且版本号开始应用于该产品。

Java 的下一个升级是 J2SE 1.3。此版本的 Java 是对原始 Java 2 版本的第一次重大升级。在大多数情况下，它增加了现有功能并“收紧”了开发环境。J2SE的发布1.4进一步增强了Java。此版本包含几个重要的新特性，包括链式异常、基于通道的 I/O 和 assert 关键字。

## 计算机代写|Java代写|The Origins of Java

Java 由 Sun Microsystems 的 James Gosling、Patrick Naughton、Chris Warth、Ed Frank 和 Mike Sheridan 于 1991 年构思。这种语言最初被称为“Oak”，但在 1995 年更名为“Java”。有点令人惊讶的是，Java 最初的动力并不是互联网！相反，主要动机是需要一种独立于平台的语言，该语言可用于创建嵌入各种消费电子设备（如烤面包机、微波炉和遥控器）的软件。您可能会猜到，许多不同类型的 CPU 都用作控制器。问题在于（当时）大多数计算机语言都被设计为编译成针对特定类型 CPU 的机器代码。例如，考虑C++语。

## 有限元方法代写

tatistics-lab作为专业的留学生服务机构，多年来已为美国、英国、加拿大、澳洲等留学热门地的学生提供专业的学术服务，包括但不限于Essay代写，Assignment代写，Dissertation代写，Report代写，小组作业代写，Proposal代写，Paper代写，Presentation代写，计算机作业代写，论文修改和润色，网课代做，exam代考等等。写作范围涵盖高中，本科，研究生等海外留学全阶段，辐射金融，经济学，会计学，审计学，管理学等全球99%专业科目。写作团队既有专业英语母语作者，也有海外名校硕博留学生，每位写作老师都拥有过硬的语言能力，专业的学科背景和学术写作经验。我们承诺100%原创，100%专业，100%准时，100%满意。

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。