java学习之 GUI编程画图

import java.awt.*;

public class TestPaint {
public static void main(String[] args) {
new PaintFrame().launchFrame();
}
}

class PaintFrame extends Frame {

public void launchFrame() {
setBounds(200,200,640,480);
setVisible(true);
}

public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(Color.red);
g.fillOval(50, 50, 30, 30);
g.setColor(Color.green);
g.fillRect(80,80,40,40);
g.setColor(c);
}