编辑代码

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {

        String dbusername = "admin";
        String dbuserpass = "123456";
        int count = 1;
        while(count<=3) {
            Scanner sc= new Scanner(System.in);
            System.out.println("请输入用户名");
            String uusername = sc.nextLine();
            System.out.println("请输入用户密码");
            String uuserpass = sc.nextLine();
            if (uusername.equals(dbusername)) {
                if (uuserpass.equals(dbuserpass)) {
                    System.out.println("登录成功");
                    break;
                } else {
                    System.out.println("用户名或密码错误");
                }
            } else {
                System.out.println("用户名或密码错误");
            }
            count ++;
        }
        if(count==4){
            System.out.println("达到最大登录次数");
        }
    }
}