请问为什么JComboBox不能调用KeyListener事件的？

Question

程序如下。得不行的。有谁知应怎样改？
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class Frame1 extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  JComboBox jComboBox1 = new JComboBox();  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("Frame Title");
    jComboBox1.addKeyListener(new Frame1_jComboBox1_keyAdapter(this));
    jComboBox1.setEditable(true);
    contentPane.add(jComboBox1, BorderLayout.NORTH);
    this.setSize(200,200);
    this.setVisible(true);
  }  void jComboBox1_keyPressed(KeyEvent e) {
    System.out.println("hi");
  }
  
  public static void main(String[] args) {
new Frame1();
  }
}class Frame1_jComboBox1_keyAdapter extends java.awt.event.KeyAdapter {
  Frame1 adaptee;  Frame1_jComboBox1_keyAdapter(Frame1 adaptee) {
    this.adaptee = adaptee;
  }
  public void keyPressed(KeyEvent e) {
    adaptee.jComboBox1_keyPressed(e);
  }
}

Answer 1

将这行:
jComboBox1.addKeyListener(new Frame1_jComboBox1_keyAdapter(this));
改为:
jComboBox1.getEditor().getEditorComponent().addKeyListener(new Frame1_jComboBox1_keyAdapter(this));