While循环详解

 1 package struct;
 2 
 3 public class WhileDemo01 {
 4     public static void main(String[] args) {
 5         int i = 0;
 6         while(i<100){
 7             i++;
 8             System.out.println(i);
 9         }
10     }
11 }

 1 package struct;
 2 
 3 public class WhileDemo02 {
 4     public static void main(String[] args) {
 5         //死循环
 6         while(true){
 7             //等待客户端连接
 8             //等时检查
 9             //
10         }
11     }
12 }

 1 package struct;
 2 
 3 public class WhileDemo03 {
 4     public static void main(String[] args) {
 5         //计算1+2+3+...+100=？
 6         int i = 0 ;
 7         int sum  = 0;
 8 
 9         while(i<=100){
10             sum  = sum +i;
11             i++;
12         }
13         System.out.println(sum);//5050
14     }
15 }

 1 package struct;
 2 
 3 public class DoWhileDemo01 {
 4     public static void main(String[] args) {
 5         int i = 0;
 6         int sum = 0;
 7         do {
 8             sum = sum + i;
 9             i++;
10         }while (i<=100);
11         System.out.println(sum);//5050
12     }
13 }

 1 package struct;
 2 
 3 public class DoWhileDemo02 {
 4     public static void main(String[] args) {
 5         int a = 0;
 6         while(a<0){
 7             System.out.println(a);
 8             a++;
 9         }
10         System.out.println("=====================");
11         do {
12             System.out.println(a);
13             a++;
14         }while (a<0);
15     }
16 }

posted on 2022-07-21 16:23 一枚努力学习的小白阅读(51) 评论(0) 编辑收藏举报