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Java Swing - 如何强制图像留在JTextArea

jtextarea 【jtextarea】
我们想知道如何强制图像留在JTextArea。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;

public class Main{
  public static void main(String[] args) {
    JFrame f = new JFrame();
    MyTextArea txt = new MyTextArea();
    f.getContentPane().add(txt);
    f.getContentPane().add(new JButton("OK"), BorderLayout.SOUTH);
    f.pack();
    f.setVisible(true);

 }
} 

class MyTextArea extends JTextArea implements MouseListener {
   private Image myImage;
   public MyTextArea() {
      addMouseListener(this);
   }
   public void addImage(Image image) {
      this.myImage = image;
      invalidate();
      repaint();
   }
   @Override
   public void paintComponent(Graphics g) {
      super.paintComponent(g);
      g.drawImage(myImage, 0, 0, this);
   }
   @Override
   public void mouseClicked(MouseEvent e) {
      ImageIcon img = new ImageIcon("yourImage.png"); 
      //place image in your working directory
      addImage(img.getImage());
   }
   @Override
   public void mousePressed(MouseEvent e) {
   }

   @Override
   public void mouseReleased(MouseEvent e) {
   }

   @Override
   public void mouseEntered(MouseEvent e) {
   }

   @Override
   public void mouseExited(MouseEvent e) {
   }
}