如何用Java实现简单的密码登录

import java.util.HashMap;
import java.util.Scanner;

public class LoginSystem {
    private static HashMap<String, String> users = new HashMap<>();

    public static void main(String[] args) {
        // 添加一些测试用户
        users.put("user1", "password1");
        users.put("user2", "password2");

        // 调用登录方法
        login();
    }

    public static void login() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入用户名：");
        String username = scanner.nextLine();

        System.out.print("请输入密码：");
        String password = scanner.nextLine();

        if (users.containsKey(username) && users.get(username).equals(password)) {
            System.out.println("登录成功！");
        } else {
            System.out.println("登录失败！");
        }

        scanner.close();
    }
}