我可以在一个JPanel中画图吗？有例子最好！

[xxben]

如题

[freelong2003]

完全可以

public class RTWindow extends JPanel{

private Image image;

public RTWindow(){
this.setVisible(true);
this.setPreferredSize(new Dimension(120,25));
}

public void paint(Graphics g) {
super.paint(g);
g.setXORMode(this.getBackground());
Graphics2D g2=(Graphics2D)g;
Stroke stroke=new BasicStroke(0.1f);
Stroke stroke2=new BasicStroke(2.0f);
g2.setStroke(stroke);
g2.setColor(Color.white);
g2.drawRect(10,10,100,5);
g2.setColor(Color.red);
g2.fillRect(10,10,30,5);
g2.setColor(Color.green);
g2.fillRect(40,10,70,5);
g2.setStroke(stroke2);
g2.setColor(Color.black);
g2.drawLine(50,10,50,15);



/**@todo Override this java.awt.Component method*/
g.drawImage(image,30,30,this);
}

void jButton1_actionPerformed(ActionEvent e) {
Graphics g=this.getGraphics();
image.flush();
g.drawImage(image,30,30,this);
}


}