package com.xu.struct;

public class DoWhileDemo02 {
    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);
    }
}

//结果是前者什么也没有输出，后者是0

"D:\Program Files\Java\jdk1.8.0_281\bin\java.exe" "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2021.1\lib\idea_rt.jar=63066:D:\Program Files\JetBrains\IntelliJ 
====================
0

Process finished with exit code 0