DoWhile

 

package struct;

public class DoWhile {
    public static void main(String[] args) {
        int a =0;
        while (a<0){
            a++;
            System.out.println(a);//条件不成立，无法输出内容
        }
        System.out.println("==================");
        do {

            System.out.println(a);//0
            a++;
            System.out.println(a);//1
        }
        while (a<0);
    }
}