帮我用java写一个飞翔的小鸟游戏并且要有登陆界面

好的，下面是一个简单的用Java实现的飞翔小鸟游戏，包括登陆界面和游戏界面：

登陆界面(LoginForm.java)：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class LoginForm extends JFrame implements ActionListener {
    private JLabel titleLabel, usernameLabel, passwordLabel;
    private JTextField usernameField;
    private JPasswordField passwordField;
    private JButton loginButton, exitButton;

    public LoginForm() {
        super("飞翔小鸟登陆");
        setLayout(new GridLayout(4, 2, 5, 5));
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        titleLabel = new JLabel("飞翔小鸟登陆", JLabel.CENTER);
        titleLabel.setFont(new Font("宋体", Font.BOLD, 24));
        add(titleLabel);

        usernameLabel = new JLabel("用户名：", JLabel.RIGHT);
        add(usernameLabel);
        usernameField = new JTextField();
        add(usernameField);

        passwordLabel = new JLabel("密码：", JLabel.RIGHT);
        add(passwordLabel);
        passwordField = new JPasswordField();
        add(passwordField);

        loginButton = new JButton("登陆");
        loginButton.addActionListener(this);
        add(loginButton);

        exitButton = new JButton("退出");
        exitButton.addActionListener(this);
        add(exitButton);

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == loginButton) {
            String username = usernameField.getText();
            String password = new String(passwordField.getPassword());
            if (username.equals("admin") && password.equals("123456")) {
                new BirdGame();
                dispose();
            } else {
                JOptionPane.showMessageDialog(this, "用户名或密码错误！", "错误", JOptionPane.ERROR_MESSAGE);
            }
        } else if (e.getSource() == exitButton) {
            System.exit(0);
        }
    }

    public static void main(String[] args) {
        new LoginForm();
    }
}

游戏界面(BirdGame.java)：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;

public class BirdGame extends JFrame implements ActionListener {
    private JPanel gamePanel;
    private JLabel scoreLabel;
    private Timer timer;
    private Random rand;
    private int score;
    private boolean gameOver;
    private Bird bird;
    private Obstacle obstacle1, obstacle2;

    public BirdGame() {
        super("飞翔小鸟");
        setLayout(new BorderLayout());
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        gamePanel = new JPanel();
        gamePanel.setLayout(null);
        gamePanel.setPreferredSize(new Dimension(400, 600));
        gamePanel.setBackground(Color.WHITE);
        add(gamePanel, BorderLayout.CENTER);

        bird = new Bird();
        gamePanel.add(bird);

        obstacle1 = new Obstacle(400, 0, 80, rand.nextInt(320) + 80);
        gamePanel.add(obstacle1);

        obstacle2 = new Obstacle(600, 0, 80, rand.nextInt(320) + 80);
        gamePanel.add(obstacle2);

        scoreLabel = new JLabel("得分：0", JLabel.CENTER);
        scoreLabel.setFont(new Font("宋体", Font.BOLD, 20));
        add(scoreLabel, BorderLayout.NORTH);

        timer = new Timer(30, this);
        rand = new Random();
        score = 0;
        gameOver = false;
        timer.start();

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == timer) {
            if (!gameOver) {
                bird.move();
                obstacle1.move();
                obstacle2.move();
                if (bird.getRectangle().intersects(obstacle1.getRectangle()) 
                        || bird.getRectangle().intersects(obstacle2.getRectangle()) 
                        || bird.getY() < 0 
                        || bird.getY() + bird.getHeight() > gamePanel.getHeight()) {
                    gameOver = true;
                    JOptionPane.showMessageDialog(this, "游戏结束，得分：" + score, "提示", JOptionPane.INFORMATION_MESSAGE);
                } else {
                    if (obstacle1.getX() + obstacle1.getWidth() < 0) {
                        obstacle1.setX(400);
                        obstacle1.setHeight(rand.nextInt(320) + 80);
                        score++;
                        scoreLabel.setText("得分：" + score);
                    }
                    if (obstacle2.getX() + obstacle2.getWidth() < 0) {
                        obstacle2.setX(400);
                        obstacle2.setHeight(rand.nextInt(320) + 80);
                        score++;
                        scoreLabel.setText("得分：" + score);
                    }
                }
            }
        }
    }

    private class Bird extends JLabel {
        private int x, y, width, height;
        private int speed;

        public Bird() {
            super(new ImageIcon("bird.png"));
            x = 50;
            y = 200;
            width = 50;
            height = 40;
            speed = 0;
            setBounds(x, y, width, height);
        }

        public void move() {
            speed += 1;
            y += speed;
            setBounds(x, y, width, height);
        }

        public int getX() {
            return x;
        }

        public int getY() {
            return y;
        }

        public int getWidth() {
            return width;
        }

        public int getHeight() {
            return height;
        }

        public Rectangle getRectangle() {
            return new Rectangle(x, y, width, height);
        }
    }

    private class Obstacle extends JLabel {
        private int x, y, width, height;

        public Obstacle(int x, int y, int width, int height) {
            super(new ImageIcon("obstacle.png"));
            this.x = x;
            this.y = y;
            this.width = width;
            this.height = height;
            setBounds(x, y, width, height);
        }

        public void move() {
            x -= 5;
            setBounds(x, y, width, height);
        }

        public int getX() {
            return x;
        }

        public void setX(int x) {
            this.x = x;
            setBounds(x, y, width, height);
        }

        public int getY() {
            return y;
        }

        public int getWidth() {
            return width;
        }

        public int getHeight() {
            return height;
        }

        public Rectangle getRectangle() {
            return new Rectangle(x, y, width, height);
        }
    }

    public static void main(String[] args) {
        new LoginForm();
    }
}

请注意，上述代码中使用了本地的"bird.png"和"obstacle.png"两个图片文件，您需要将其放置在与代码相同的目录下才能正常运行。此外，该代码仅作为示例，还有许多优化和改进的空间，您可以根据自己的需求进行修改和扩展。