怎样在一个Jpanel上画图形？

Question

public class PanelExample extends JPanel
{
  ...
  public void paintComponent(Graphics g)
  {//在这儿你想怎么画就怎么画
        super.paintComponent(g);
        g.drawImage();
        g.drawArc();
        g.draw3DRect();
        .....
  }
....
}

Answer 1

public class PanelExample extends JPanel {
    public PanelExample() {
        repaint();
    }    ...    public void paintComponent(Graphics g) {
        super.paintComponent(g);
      
        //在这儿你想怎么画就怎么画
        g.drawImage();
        g.drawArc();
        g.draw3DRect();
        .....
    }
    
    ....}