小编Luc*_*ius的帖子

我有一个JFrame2 JPanel:a PaintPanel(带paint()方法)和a ButtonPanel(带按钮).当我调用repaint()的PaintPanel(但点击该按钮)的按钮ButtonPanel被涂在PaintPanel!它不是可点击的或任何东西,它就在那里.

我尝试使用此代码重新创建问题:

public class Main {

    public static void main(String[] args) {
        JFrame frame = new JFrame("frame");
        frame.setSize(400,400);
        frame.setLayout(new GridLayout(2,1));
        PaintPanel paint = new PaintPanel();
        ButtonPanel buttons = new ButtonPanel(paint);
        frame.add(paint);
        frame.add(buttons);
        frame.setVisible(true);
    }
}

public class PaintPanel extends JPanel{
    public void paint(Graphics g){
        g.drawRect(10, 10, 10, 10);
    }
}

public class ButtonPanel extends JPanel implements ActionListener{

    private PaintPanel paintPanel;

    public ButtonPanel(PaintPanel …