Swingコンポーネントのイベントをスルーさせる

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

public class test {
  public static void main(String[] args){
    JFrame frame = new JFrame();
    Container c = frame.getContentPane();
    c.setLayout(new GridLayout(2,1));
    
    JTextField tf = new JTextField();
    final TestTextField tf2 = new TestTextField();
    
    tf.addKeyListener(new KeyListener(){
        @Override
        public void keyPressed(KeyEvent e){
          tf2.processKeyEvent(cloneEvent(e));
        }
        
        @Override
        public void keyReleased(KeyEvent e){
          tf2.processKeyEvent(cloneEvent(e));
        }
        
        @Override
        public void keyTyped(KeyEvent e){
          tf2.processKeyEvent(cloneEvent(e));
        }
        
        private KeyEvent cloneEvent(KeyEvent e){
          return new KeyEvent(
            (Component)e.getSource(),
            e.getID(),
            e.getWhen(),
            e.getModifiers(),
            e.getKeyCode(),
            e.getKeyChar(),
            e.getKeyLocation() );
        }
        
    });
    c.add(tf);
    c.add(tf2);
    
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
    
  }
}

class TestTextField extends JTextField {
  @Override
  public void processKeyEvent(KeyEvent e){
    super.processKeyEvent(e);
  }
}