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Java Swing - 如何添加keylistener到可編輯的JcomboBox文本字段

我們想知道如何添加keylistener到可編輯的JcomboBox文本字段。 
import java.awt.FlowLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class Main extends JFrame implements KeyListener {
  JComboBox<String> combobox = new JComboBox(new String[]{"a","b","c"});
  public static void main(String[] args) {
    new Main();
  }

  private Main() {
    combobox.setEditable(true);
    JTextField editor = (JTextField) combobox.getEditor().getEditorComponent();
    editor.addKeyListener(this);
    setLayout(new FlowLayout());
    add(combobox);
    pack();
    setVisible(true);
  }

  public void keyTyped(KeyEvent arg0) {
    System.out.println("Key Typed " + arg0.getKeyCode());
  }

  public void keyPressed(KeyEvent arg0) {
    System.out.println("Key Pressed " + arg0.getKeyCode());
  }

  public void keyReleased(KeyEvent arg0) {
    System.out.println("Key Released " + arg0.getKeyCode());
  }
}