所以我有一个问题，假设我用paint方法在java中创建了一个矩形，经过100毫秒的延迟，我做了super.paint（g），这会清除前面显示的矩形，有没有办法让它重新出现？
谢谢！
下面是我所说的例子，这个程序的目的是每当我按下鼠标按钮1时，它会创建一个向下的矩形，然后在鼠标按钮1关闭后消失。问题是每当我再次按下鼠标按钮1时，矩形就不会出现。
头等舱：

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;

import javax.swing.JFrame;
import javax.swing.Timer;

public class RecoilHelper extends JFrame {

static Timer rs;
static int recoil = 540;
static boolean clearRectangle = false;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    JNativehookRecoilHelp.main(null);
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                RecoilHelper frame = new RecoilHelper();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public RecoilHelper() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {

    setBounds(0, 0, 1920, 1080);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setUndecorated(true);
    setBackground(new Color(1.0f,1.0f,1.0f,0.0f));
    setAlwaysOnTop(true);

    rs = new Timer(10,(ActionEvent e)->{
        repaint();

        recoil += 12;

        if (recoil>600) {

            rs.stop();
        }

    });

}

public void paint(Graphics g) { 

    Rectangle r = new Rectangle(960, recoil, 4, 4);
    System.out.println(recoil);
    super.paintComponents(g);
    g.fillRect(
       (int)r.getX(),
       (int)r.getY(),
       (int)r.getWidth(),
       (int)r.getHeight()
    );  
    if (clearRectangle) {
        super.paint(g);
    } 

}

}

第二类（使用jnativehook跟踪鼠标按钮1事件）：

import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.Logger;

import org.jnativehook.GlobalScreen;
import org.jnativehook.NativeHookException;
import org.jnativehook.mouse.NativeMouseEvent;
import org.jnativehook.mouse.NativeMouseInputListener;

public class JNativehookRecoilHelp implements NativeMouseInputListener {

@Override
public void nativeMouseClicked(NativeMouseEvent arg0) {
    // TODO Auto-generated method stub

}

@Override
public void nativeMousePressed(NativeMouseEvent arg0) {
    // TODO Auto-generated method stub
    System.out.println("Pressed");
    RecoilHelper.recoil = 540;
    RecoilHelper.rs.start();

}

@Override
public void nativeMouseReleased(NativeMouseEvent arg0) {
    // TODO Auto-generated method stub
    System.out.println("Released");
    RecoilHelper.clearRectangle=true;

}

@Override
public void nativeMouseDragged(NativeMouseEvent arg0) {
    // TODO Auto-generated method stub

}

@Override
public void nativeMouseMoved(NativeMouseEvent arg0) {
    // TODO Auto-generated method stub

}
public static void main(String[] args) {
    GlobalScreen.addNativeMouseListener(new JNativehookRecoilHelp());
    LogManager.getLogManager().reset();

    // Get the logger for "org.jnativehook" and set the level to off.
    Logger logger = Logger.getLogger(GlobalScreen.class.getPackage().getName());
    logger.setLevel(Level.OFF);

    try {
        GlobalScreen.registerNativeHook();
    }
    catch (NativeHookException ex) {

        System.exit(1);
    }
}

}