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import java.awt.*;
import java.awt.event.*;
public class TankClient extends Frame {
int x, y = 50;
public static final int GAME_WIDTH = 800;
public static final int GAME_HEIGHT = 600;
Image offScreenImage = null; //A
public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(Color.red);
g.fillOval(x, y, 30, 30);
g.setColor(c);
}
public void update(Graphics g) {
if(offScreenImage == null) { //B
offScreenImage = this.createImage(GAME_WIDTH, GAME_HEIGHT); //B
} //B
Graphics imageG = offScreenImage.getGraphics();
Color c = imageG.getColor();
imageG.setColor(Color.green);
imageG.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
imageG.setColor(c);
paint(imageG);
g.drawImage(offScreenImage, 0, 0, null);
}
public void launchFrame() {
setBounds(400, 300, GAME_WIDTH, GAME_HEIGHT);
setResizable(false);
setTitle("TankWar");
setBackground(Color.green);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
addKeyListener(new KeyMonitor());
setVisible(true);
new Thread(new PaintThread()).start();
}
private class PaintThread implements Runnable {
public void run() {
while(true) {
repaint();
try {
Thread.sleep(30);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
private class KeyMonitor extends KeyAdapter {
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
switch(key) {
case KeyEvent.VK_LEFT:
x -= 5;
break;
case KeyEvent.VK_RIGHT:
x += 5;
break;
case KeyEvent.VK_UP:
y -= 5;
break;
case KeyEvent.VK_DOWN:
y += 5;
break;
}
}
}
public static void main(String[] args) {
TankClient tc = new TankClient();
tc.launchFrame();
}
}