package keyevent;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFrame {  JPanel contentPane;  BorderLayout borderLayout1 = new BorderLayout();  Label label1 = new Label();  /**Construct the frame*/  public Frame1() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    label1.setFont(new java.awt.Font("Dialog", 1, 80));    contentPane.setLayout(borderLayout1);    this.setSize(new Dimension(243, 177));    this.setTitle("KeyEvent演示程序");    this.addKeyListener(new java.awt.event.KeyAdapter() {      public void keyPressed(KeyEvent e) {        this_keyPressed(e);      }    });    contentPane.add(label1, BorderLayout.CENTER);  }  /**Overridden so we can exit when window is closed*/  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  void this_keyPressed(KeyEvent e) {  String s = "";   label1.setText(s+=e.getKeyChar());  }}