### 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。

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• 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\$

## 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。