### 计算机代写|Java代写|Ask the Expert

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
• 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|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

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## 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。