While-Do.While

While-Do.While

package com.andy.base.Andy.operator.structure;

public class DoWhileDemo01 {
    public static void main(String[] args) {

        int i = 0;
        int sum = 0;
        do {
            sum = sum + i;
            i++;
        }while (i<=100);
        System.out.println(sum);
    }

}

package com.andy.base.Andy.operator.structure;

public class DoWhileDemo02 {
    public static void main(String[] args) {
        //do.while至少循环一次
         int a = 0;
         while (a<0){
             System.out.println(a);
             a++;
         }
        System.out.println("=============");
         do {
             System.out.println(a);
             a++;
         }while(a<0);

    }

}