DoWhile循环

package zaiyang.struct;

public class DoDemo01 {
    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 zaiyang.struct;

public class DoDemo02 {
    public static void main(String[] args) {
        int a = 0;
        while (a<0){
            System.out.println(a);
            a++;
        }
        System.out.println("======================================");
        do {
            System.out.println(a);
            a++;
        }while (a<0);
         //while是先判断再循环，do....while是先循环再判断
    }
}