Java贪吃蛇游戏实现 - 带边界碰撞检测

// Press Shift twice to open the Search Everywhere dialog and type 'show whitespaces', // then press Enter. You can now see whitespace characters in your code. package com.firefor01;

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

public class test extends JFrame implements ActionListener { String name; JButton jbn = new JButton('开始'); D jpn = new D();

test() {
    Container cn = getContentPane();
    cn.setLayout(new BorderLayout());
    cn.add(jbn, BorderLayout.NORTH);
    cn.add(jpn, BorderLayout.CENTER);
    jbn.addActionListener(this);
    setSize(600, 400);
    setVisible(true);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置窗口关闭时退出程序
}

public void actionPerformed(ActionEvent e) {
    Thread t1 = new Thread(jpn);
    t1.start();
    jpn.requestFocus(true);
}

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

}

class D extends JPanel implements Runnable, KeyListener { int x = 10; int direction = 0; Random r = new Random(); Vector v = new Vector(); Point food = new Point();

D() {
    v.add(new Point(20, 10));
    v.add(new Point(20, 10));
    v.add(new Point(20, 10));
    v.add(new Point(20, 10));

    int t = r.nextInt(20);
    food.x = t * 10;
    food.y = t * 10;
    addKeyListener(this);
}

public void paint(Graphics g) {
    super.paint(g);
    for (int i = 0; i < v.size(); i++) {
        Point p = v.get(i);
        int x = p.x;
        int y = p.y;
        if (i == v.size() - 1) {
            g.setColor(Color.blue);
            g.fillOval(x, y, 9, 9);
        } else {
            g.setColor(Color.black);
            g.fillOval(x, y, 9, 9);
        }
    }

    int x = food.x;
    int y = food.y;
    g.setColor(Color.red);
    g.fillRect(x, y, 9, 9);
}

public void keyPressed(KeyEvent e) {
    if (e.getKeyCode() == KeyEvent.VK_UP) {
        direction = 2;
    }
    if (e.getKeyCode() == KeyEvent.VK_DOWN) {
        direction = 3;
    }
    if (e.getKeyCode() == KeyEvent.VK_LEFT) {
        direction = 1;
    }
    if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
        direction = 0;
    }
}

public void keyReleased(KeyEvent e) {

}

public void keyTyped(KeyEvent e) {

}

public void run() {
    try {
        while (true) {
            Point p = v.get(v.size() - 1);
            if (p.x < 0 || p.x >= getWidth() || p.y < 0 || p.y >= getHeight()) { // 判断是否撞墙
                JOptionPane.showMessageDialog(this, '游戏结束！', '提示', JOptionPane.INFORMATION_MESSAGE);
                System.exit(0);
            }

            for (int i = 0; i < v.size() - 1; i++) {
                Point p1 = v.get(i);
                Point p2 = v.get(i + 1);
                p1.x = p2.x;
                p1.y = p2.y;
            }
            if (direction == 0) {
                p.x = p.x + 10;
            }
            if (direction == 1) {
                p.x = p.x - 10;
            }
            if (direction == 2) {
                p.y = p.y - 10;
            }
            if (direction == 3) {
                p.y = p.y + 10;
            }

            for (int i = 0; i < v.size(); i++) {
                Point p1 = v.get(i);
                if (p1.x == food.x && p1.y == food.y) {
                    int t = r.nextInt(20);
                    food.x = t * 10;
                    food.y = t * 10;

                    v.add(new Point(p1.x, p1.y));
                    break;
                }
            }
            repaint();
            Thread.sleep(100);
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

}