循环时：

> 时：

while (test_expression) {   

 // statements        

update_expression; 


}


condition is evaluated before each iteration of the loop
if condition is true, the code block inside the while loop will execute
the process repeats until condition is false

进入ware循环的控制器。

测试条件。

1. 假如false，请退出循环。
2. 执行身体后，更新循环变量。
>
3. 从步骤2重复到条件错误。

4. example 1: display numbers from 1 to 5
   
   // program to display numbers from 1 to 5
   
   class main {
     public static void main(string[] args) {
   
       // declare variables
       int i = 1, n = 5;
   
       // while loop from 1 to 5
       while(i <= n) {
         system.out.println(i);
         i++;
       }
     }
   }
   
   output:
   1
   2
   3
   4
   5
   

任务1：

program:
public class count {

    public static void main(string[] args) {
    int count=1;
        while (count<=5){
        count=count+1;
        system.out.println("count: "+count);
        }
        }
        }

output:
count: 2
count: 3
count: 4
count: 5
count: 6

>任务2：

program:

public class count1 {

    public static void main(string[] args) {
        int count=5;
        while (count>=1) {
        count=count-1;
        {
        system.out.println("count:" +count);
        }
        }
    }
}

output:
count:4
count:3
count:2
count:1
count:0

任务3：

program:
public class count2 {
    public static void main (string args[])
    {
    int count=0;
    while(count<10) {
    count=count+2;
    {
    system.out.println("count:" +count);
    }
    }
    }
}
output:
count:2
count:4
count:6
count:8
count:10

>任务4：

program:
public class Count3 {
    public static void main (String args[])
    {
    int count=1;
    while(count<=10) {
    count=count+2;
    {
    System.out.println("count:" +count);
    }
    }
    }

}
output:

count:3
count:5
count:7
count:9
count:11

参考：

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