import java.awt.*; import java.awt.event.*; import javax.swing.*;class TankFrame extends JFrame  {    TankThread tankThread;    MyTank mytank;    EnemyTank enemyTank[][]=new EnemyTank[3][2];    Brick brick;    Fort fort;    Prop prop;    Ball myBall;    Ball enemyBall[][]=new Ball[3][2];    //JPanel jp;    Graphics gra;    Graphics grahics;    int grade;    Image ima;    Image image;    Subtitle subtitle;    boolean gamestart;    JFrame jf;public TankFrame() {    setTitle("坦克大戰");    setSize(600, 600);       setLocation(150, 100);       setResizable(false);    setVisible(true);    addWindowListener(new K());       gamestart=false;   }public void paint(Graphics g){    if (gra == null) {	ima = createImage(520, 600);	gra = ima.getGraphics();    }       gra.setColor(Color.BLUE);    gra.fill3DRect(0, 0, this.getWidth(), this.getHeight(), true);    if(myBall!=null)        myBall.paint(gra);    else{}    for(int i=0;i<3;i++){        for(int j=0;j<2;j++){            if(enemyBall[i][j]!=null){                enemyBall[i][j].paint(gra);            }            else{}        }    }    if(mytank!=null)        mytank.paint(gra);    else{}    for(int i=0;i<3;i++){        for(int j=0;j<2;j++){            if(enemyTank[i][j]!=null){                enemyTank[i][j].paint(gra);            }            else{}        }    }        if(brick!=null)        brick.paint(gra);    else{}    if(fort!=null)        fort.paint(gra);    if(prop!=null){        if(prop.life%5!=0){           prop.paint(gra);        }    }        g.drawImage(ima, 0, 0,520,600, null);    if (grahics == null) {	image = createImage(80, 600);	grahics = image.getGraphics();    }    grahics.setColor(Color.CYAN);    grahics.fill3DRect(0, 0, this.getWidth(), this.getHeight(), true);    if(subtitle!=null)        subtitle.paint(grahics);    g.drawImage(image, 520, 0,80,600, null);}public void update(Graphics g){     paint(g);}private class K implements WindowListener{        public void windowOpened(WindowEvent e) {        }        public void windowClosing(WindowEvent e) {            System.exit(0);        }        public void windowClosed(WindowEvent e) {        }        public void windowIconified(WindowEvent e) {        }        public void windowDeiconified(WindowEvent e) {        }        public void windowActivated(WindowEvent e) {        }        public void windowDeactivated(WindowEvent e) {        }    }}