清除JPanel或JFrame

Question

没有使用super.paintComponent(g);可以我仍然清除我的Jpanel或Jframe屏幕？我在JPanel上绘制了一些形状,我希望在用户按下右键而不使用此方法时清除所有绘图.或者我说是在Java中有任何替代的super.paintCompenent(g)方法或方法clrscr();.

编辑

  public void mousePressed(MouseEvent e) {
            super.paintComponents(null); //i want to use this method here?? how can i? 
            if(e.isPopupTrigger())
            {
                s=e.getX();
                as=e.getY();
              try {
                    Thread.sleep(10L);
                } catch (InterruptedException ex) {
                    Logger.getLogger(animate.class.getName()).log(Level.SEVERE, null, ex);
                }
        p.repaint();
            }
        }

我正在画这样的形状

public class mypanel extends JPanel {

   @Override
    public void paintComponent(Graphics g)
    {

       super.paintComponent(g);
        Graphics2D g2=(Graphics2D)g ;

        Color[] c = {Color.BLUE, Color.RED, Color.GREEN, Color.YELLOW, 
                 Color.MAGENTA, Color.WHITE, Color.ORANGE, Color.PINK};
    for(int i=0; i<8; ++i){
        g2.setColor(c[i]);
        int start_angle=i*45;
    g2.fillArc(mx-100, my-100, 200, 200, start_angle,45);



    }

Answer 1

MRE解决方案实际上是一个好主意,但如果另一重绘进来你可能有问题,(因为你移动的JFrame,因为你调整它,因为另一个窗口出现在它的上面,然后leavs,等...)

或者,你可以使用这样的东西来永久改变:

public class mypanel extends JPanel {

    private boolean draw = true;

    @Override
    public void paintComponent(Graphics g)
    {

        super.paintComponent(g);
        if (draw) {
            Graphics2D g2=(Graphics2D)g ;

            Color[] c = {Color.BLUE, Color.RED, Color.GREEN, Color.YELLOW, 
                     Color.MAGENTA, Color.WHITE, Color.ORANGE, Color.PINK};
            for(int i=0; i<8; ++i){
                g2.setColor(c[i]);
            int start_angle=i*45;
            g2.fillArc(mx-100, my-100, 200, 200, start_angle,45);
        }
    }

    public void setDraw(boolean draw) {
        this.draw = draw;
        repaint();
    }
}

然后你可以通过调用mypanel.setDraw(boolean)在你的JPanel simlpy中绘制或不绘图