消息推送系统

private String username;

private String password;

public User(String username, String password) {

this.username = username;

this.password = password;

}

// Getter and Setter methods

}

import java.util.Map;

public class LoginService {

private Map users = new HashMap<>();

public boolean login(String username, String password) {

User user = users.get(username);

if (user != null && user.getPassword().equals(password)) {

return true;

}

return false;

}

public void addUser(User user) {

大学综合门户

users.put(user.getUsername(), user);

}

}