키이벤트

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import java.awt.*; import java.awt.event.*; import javax.swing.*; public class KeyDemo extends JFrame implements KeyListener {    private String [] area={"한국","중국","미국","미국","일본","캐나다","호주","러시아","프랑스","사우디"};    private String line1;    private JTextField text;    private JLabel jh;          public KeyDemo()    {       super( "Demonstrating Keystroke Events" );       jh=new JLabel("숫자를 입력하세요");       text=new JTextField(20);              setLayout(new GridLayout(2,1));      JPanel panel = new JPanel();     JPanel pane2 = new JPanel();     panel.add(jh);     panel.add(text);           text.setEnabled(false);     add(panel);           addKeyListener( this );  // allow frame to process Key events       setSize( 250, 150 );       jh.setVisible( true );       text.setVisible( true );       setVisible( true );    } // end KeyDemo constructor    public void keyPressed( KeyEvent event )    {       line1 = event.getKeyText( event.getKeyCode() );       char s ;       s=line1.charAt(0);                 setLines2and3( event,s);                                           }    // handle release of any key    public void keyReleased( KeyEvent event )    {           }    public void keyTyped( KeyEvent event )    {    }      private void setLines2and3( KeyEvent event,char s )    {        if (Character.isDigit(s)==true)        {                      System.out.println(area[Integer.parseInt(line1)]);          text.setText(area[Integer.parseInt(line1)]);                   }         else{             JOptionPane.showMessageDialog(null,             "숫자를 입력해주세요" );                       }      }    public static void main( String args[] )    {       KeyDemo application = new KeyDemo();       application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );    } }