随机生成三位密码，然后穷举法破解密码

package P4_11;

import java.util.Random;
/*1. 生成一个长度是3的随机字符串，把这个字符串作为当做密码

2. 使用穷举法生成长度是3个字符串，匹配上述生成的密码*/
public class Admin {
    private  final String admin;
    private static boolean flag;
    {
        Random random = new Random();
        this.admin= Integer.toString(random.nextInt(900)+100) ;
    }
    public void getAdmin(){
        int admin;
        for (int i = 1; i < 10; i++) {
            for (int j = 0; j < 10; j++) {
                for (int k = 0; k < 10; k++) {
                    admin=i*100+j*10+k;
                    if (admin==Integer.parseInt(this.admin)){
                        flag=true;
                        return;
                    }
                }
            }
        }
    }

    public static void main(String[] args) {
        Admin ad = new Admin();
        ad.getAdmin();
        if (flag) {
            System.out.println("密码正确！");
            System.out.println("密码为："+ad.admin);
        }
    }
}