package com.imooc;

public class forDemo {

    public static void main(String[] args) {
        int m=1;//外重循环的循环变量:
        int n=1;//内重循环的循环变量:
        System.out.println("输出4行4列的型号");
        while(m<=4) {
            //内重循环控制每行输出几个星号:
            n=1;
            while(n<=4) {
                System.out.print("*");
                n++;
            }
            System.out.println();
            m++;
        }
    }

}