Java模拟弹球效果(监听键盘)

 1 import java.awt.*;

 2 import java.awt.event.*;

 3 

 4 public class BallGame  extends Frame {

 5     

 6     Image sun = Toolkit.getDefaultToolkit().getImage("sun.jpg");

 7     

 8     double x=200;

 9     double y=200;

10     boolean left,right,up,down;

11     public void paint(Graphics  g){

12         g.drawImage(sun, (int)x, (int)y, null);

13         if(left){

14             x = x-10;

15         }

16         if(right){

17             x = x+10;

18         }

19         if(up){

20             y = y-10;

21         }

22         if(down){

23             y = y+10;

24         }

25         

26     }

27     

28     void launchFrame(){

29         setSize(500,400);

30         setLocation(80, 80);

31         setBackground(Color.black);

32         setTitle("火星十一郎");

33         myEvent();

34         setVisible(true);

35         new PaintThread().start();  

36         addKeyListener(new KeyMonitor());

37     }

38     

39     public static void main(String[] args){  

40         new BallGame().launchFrame();

41     }

42     

43     class PaintThread extends Thread {

44         public void run(){

45             while(true){

46                 repaint();

47                 try {

48                     Thread.sleep(40);

49                 } catch (InterruptedException e) {

50                     e.printStackTrace();

51                 }   //1秒=1000毫秒！

52             }

53         }

54     }

55     

56     class  KeyMonitor extends KeyAdapter {

57         public void keyPressed(KeyEvent e){

58             if(37==e.getKeyCode()){

59                 left=true;

60             }

61             if(39==e.getKeyCode()){

62                 right = true;

63             }

64             if(38==e.getKeyCode()){

65                 up = true;

66             }

67             if(40==e.getKeyCode()){

68                 down = true;

69             }

70         }

71         

72         public void keyReleased(KeyEvent e){

73             if(37==e.getKeyCode()){

74                 left=false;

75             }

76             if(39==e.getKeyCode()){

77                 right = false;

78             }

79             if(38==e.getKeyCode()){

80                 up = false;

81             }

82             if(40==e.getKeyCode()){

83                 down = false;

84             }

85         }

86     }

87     private void myEvent()

88     {

89         this.addWindowListener(new WindowAdapter()//窗口监听

90         {

91             public void windowClosing(WindowEvent e)

92             {

93                 System.exit(0);

94             }

95         });

96     }

97 }