https://youtu.be/_6l6nmdvvsg

正如您在视频中看到的，如果键入contentPane.repaint（），然后键入；，repaint会自动更改为getIgnoreRepaint（）。 我在想如何解决这个问题。

来源是

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


class RandomThread extends Thread{
    Container contentPane;
    boolean flag = false;
    public RandomThread(Container contentPane) {
        this.contentPane = contentPane;
    }

    void finish() {
        flag = true;
    }

    public void run()
    {
        while(true)
        {
            int x = ((int)(Math.random()*contentPane.getWidth()));
            int y = ((int)(Math.random()*contentPane.getHeight()));
            JLabel label = new JLabel("Java");
            label.setSize(80,30);
            label.setLocation(x, y);
            contentPane.add(label);
            contentPane.getIgnoreRepaint(); // why this happen?
            try {
                Thread.sleep(300);
                if(flag == true) {
                    contentPane.removeAll();
                    label = new JLabel("finish");
                    label.setSize(80, 30);
                    label.setLocation(100, 100);
                    label.setForeground(Color.red);
                    contentPane.add(label);
                    contentPane.getIgnoreRepaint();  //same problem
                    return;
                }
            }
            catch(InterruptedException e) { return; }
        }
    }
}