Java简单小游戏

虽然Java学了很久了，但是什么也没学到，最近实习，老师在课堂授课时用这个小游戏来讲解Java中的基础知识，在这里拿出来作为学习过程的记录，希望能够每天进步。

代码如下：

package screen;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class BallFrame {

    public static void main(String[] args) {
        JFrame f = new JFrame();
        BallPanel b=new BallPanel();
        f.add(b);
        f.setTitle("PlayBall");
        f.setSize( 1000, 800);
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(3);
        f.setVisible(true);    
        f.addMouseMotionListener(b);
        f.addMouseListener(b);
        b.move();

    }

}

class BallPanel extends JPanel implements MouseMotionListener,MouseListener{
    int px=300,bx=600,by=150;
    int dir=(int)(Math.random()*4+1);
    int sc=0,sleep=15;
    
    int state = START;
    public static final int START = 1;
    public static final int RUNNING = 2;
    public static final int PAUSE = 3;
    public static final int OVER = 4;
    public static final int RESTART = 5;
    Color c;

    @Override
    public void paint(Graphics g) {
        String score="分数:"+String.valueOf(sc);
        super.paint(g);
        g.setColor(c);
        g.fillOval(bx, by, 100, 100);
        g.setColor(Color.black);
        g.fillRect( px, 700, 200, 10);
        g.drawRoundRect(0, 0, 100, 30, 5, 5);
        g.setFont(new Font("TimesRoman",Font.BOLD,24));
        g.drawString(score, 10, 20);
        if(state==START){
            g.setColor(Color.blue);
            g.drawString("点击屏幕开始游戏", 300, 200);            
        }
        if(state==PAUSE){
            g.setColor(Color.orange);
            g.drawString("游戏已经暂停", 300, 200);            
        }
        if(state==OVER){
            g.setColor(Color.RED);
            g.drawString("游戏结束，点击屏幕开始新游戏", 250, 200);            
        }
        
    }
    
    public void move(){
        new Thread(){
            public void run() {
                super.run();
                while(true){
                    if(state==RUNNING){
                        switch (dir) {
                        case 1:{
                            bx+=10;
                            by+=10;
                            break;
                        }case 2:{
                            bx-=10;
                            by+=10;
                            break;
                        }case 3:{
                            bx-=10;
                              by-=10;
                            break;
                        }case 4:{
                            bx+=10;
                            by-=10;
                            break;
                        }default:
                            break;
                        }
                      
                      //边界值
                        if(bx>900){
                            if(dir==1){dir=2;}
                            if(dir==4){dir=3;}
                        }
                        if(bx<0){
                            if(dir==2){dir=1;}
                            if(dir==3){dir=4;}
                        }
                        if(by>600){
                            if(px-100<bx&&bx<(px+200)){
                                c=new Color((int)(Math.random()*256), (int)(Math.random()*256), (int)(Math.random()*256));
                                if(dir==1){dir=4;}
                                if(dir==2){dir=3;}    
                                sc++;
                            }
                            else{
                                by=600;
//                                JOptionPane.showMessageDialog(null, "你好，游戏已结束，你得了"+sc+"分！", "游戏结束", JOptionPane.INFORMATION_MESSAGE);
                                state=OVER;
                            }
                        }
                        if(by<0){
                            if(dir==4){dir=1;}
                            if(dir==3){dir=2;}
                        }
                        repaint();
                        try {
                            Thread.sleep(sleep-(sc/10));
                        } catch (InterruptedException e) {
                            // TODO 自动生成的 catch 块
                            e.printStackTrace();
                        }
                    }                    
                }                    
            };
        }.start();
    }

    @Override
    public void mouseDragged(MouseEvent e) {
        // TODO 自动生成的方法存根
        
    }

    @Override
    public void mouseMoved(MouseEvent e) {
        if(e.getX()<770){
            px=e.getX()-50;
        }        
        
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        if(state==START){
            state=RUNNING;
        }else if(state==RUNNING){
            state=PAUSE;
        }else if(state==PAUSE){
            state=RUNNING;
        }else if(state==OVER){
            px=300;bx=500;by=100;
            dir=(int)(Math.random()*4+1);
            sc=0;sleep=15;            
            state=RUNNING;
        }
        repaint();
        
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // TODO 自动生成的方法存根
        
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO 自动生成的方法存根
        
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        if(state==PAUSE){
            state=RUNNING;
            repaint();
        }
        
    }

    @Override
    public void mouseExited(MouseEvent e) {
        if(state==RUNNING){
            state=PAUSE;
            repaint();
        }
        
    }
}

游戏虽然简单，却写的很艰难，可以看到自己还有很大差距，接下来继续努力！

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