新手想写个贪吃蛇的游戏，还有很多问题没有完善，现在遇到的问题是addkeylistener添加不上求解!
- Java code
import java.awt.*;import java.awt.event.*;import javax.swing.*;public class SnakeGame extends JFrame{ private static final int STONE_HIGHT = 30; //snakeZ表示蛇的前进方向1234分别代表东南西北 private int snakeZ=1,foodX,foodY,length=3; private int m[]=new int[50]; private int n[]=new int[50]; private JPanel panel1,panel2; private JButton butStart,butEsc,butStop,butResume; private Canvas canvas=new Canvas() { public void paint( Graphics g ) { drawStone(g); drawSnake(g); drawNet(g); } }; public SnakeGame() { setLayout(new BorderLayout()); setBounds(300, 100, 600, 600); panel1=new JPanel(); //panel1.setBackground(Color.red); panel2=new JPanel(); //panel2.setBackground(Color.green); butStart=new JButton("开始游戏"); butEsc=new JButton("退出"); butStop=new JButton("暂停"); butResume=new JButton("继续"); add(panel1,BorderLayout.CENTER); add(panel2,BorderLayout.SOUTH); panel1.add(canvas); canvas.setSize(600, 540); canvas.setBackground(Color.gray); panel2.setLayout(new GridLayout(1,4)); panel2.add(butEsc); panel2.add(butResume); panel2.add(butStart); panel2.add(butStop); m[0]=canvas.getWidth()/2; n[0]=canvas.getHeight()/2; for(int i=1;i<length;i++) { m[i]=m[i-1]+STONE_HIGHT; n[i]=n[i-1]; } //***************监听事件************************* //开始键监听事件 butStart.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { thread t=new thread(); t.start(); } }); //退出键监听事件 butEsc.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); //暂停键监听事件 butStop.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println("暂停"); } }); //继续键监听事件 butResume.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println("继续"); } }); addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent e) { System.out.println("dfdsf"); switch(e.getKeyCode()) { case KeyEvent.VK_UP: if(snakeZ!=2) { snakeZ=4;System.out.println("dfdsfsd");refresh();}break; case KeyEvent.VK_DOWN: if(snakeZ!=4) {snakeZ=2;refresh();}break; case KeyEvent.VK_LEFT: if(snakeZ!=1) {snakeZ=3;refresh();}break; case KeyEvent.VK_RIGHT: if(snakeZ!=3) {snakeZ=1;refresh();}break; } } }); setResizable(false); setDefaultCloseOperation(EXIT_ON_CLOSE); setVisible(true); } public class thread extends Thread { public void run() { while(true) { refresh(); try { Thread.sleep(500); } catch(InterruptedException e) { } } } } public void drawStone(Graphics g) { g.setColor(Color.DARK_GRAY); g.fillRect(0, 0, STONE_HIGHT, canvas.getHeight()); g.fillRect(0, 0, canvas.getWidth(), STONE_HIGHT); g.fillRect(0, canvas.getHeight()-STONE_HIGHT, canvas.getWidth(), STONE_HIGHT); g.fillRect(canvas.getWidth()-STONE_HIGHT, 0, canvas.getWidth(), canvas.getHeight()); } public void drawNet(Graphics g) { g.setColor(Color.white); for(int i=0;i<canvas.getWidth()/STONE_HIGHT;i++) g.drawLine(i*STONE_HIGHT, 0, i*STONE_HIGHT, canvas.getHeight()); for(int i=0;i<canvas.getHeight()/STONE_HIGHT;i++) g.drawLine(0, i*STONE_HIGHT, canvas.getWidth(), i*STONE_HIGHT); } public void drawSnake(Graphics g) { g.setColor(Color.blue); for(int i=0;i<length;i++) g.fillRect(m[i], n[i], STONE_HIGHT,STONE_HIGHT); } public void refresh() { switch(snakeZ) { case 1: for(int i=length;i>=0;i--) { m[i+1]=m[i]; n[i+1]=n[i]; } m[0]=m[0]+STONE_HIGHT;break; case 2: for(int i=length;i>=0;i--) { int tempX=m[i]; int tempY=n[i]; m[i+1]=tempX; n[i+1]=tempY; } n[0]=n[0]-STONE_HIGHT;break; case 3: for(int i=length;i>=0;i--) { int tempX=m[i]; int tempY=n[i]; m[i+1]=tempX; n[i+1]=tempY; } m[0]=m[0]-STONE_HIGHT;break; case 4: for(int i=0;i<length-1;i++) { int tempX=m[i]; int tempY=n[i]; m[i+1]=tempX; n[i+1]=tempY; } n[0]=n[0]+STONE_HIGHT;break; } canvas.repaint(); } public static void main ( String args[] ) { new SnakeGame(); }}