Mega Code Archive
Demonstrating keystroke events
<![CDATA[
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class KeyDemo extends JFrame implements KeyListener
{
private String line1 = "", line2 = "";
private String line3 = "";
private JTextArea textArea;
public KeyDemo()
{
super( "Demonstrating Keystroke Events" );
textArea = new JTextArea( 10, 15 );
textArea.setText( "Press any key on the keyboard..." );
textArea.setEnabled( false );
// allow frame to process Key events
addKeyListener( this );
getContentPane().add( textArea );
setSize( 350, 100 );
show();
}
public void keyPressed( KeyEvent e )
{
line1 = "Key pressed: " + e.getKeyText( e.getKeyCode() );
setLines2and3( e );
}
public void keyReleased( KeyEvent e )
{
line1 = "Key released: " + e.getKeyText( e.getKeyCode() );
setLines2and3( e );
}
public void keyTyped( KeyEvent e )
{
line1 = "Key typed: " + e.getKeyChar();
setLines2and3( e );
}
private void setLines2and3( KeyEvent e )
{
line2 = "This key is " + ( e.isActionKey() ? "" : "not " ) + "an action key";
String temp = e.getKeyModifiersText( e.getModifiers() );
line3 = "Modifier keys pressed: " + ( temp.equals( "" ) ? "none" : temp );
textArea.setText( line1 + "\n" + line2 + "\n" + line3 + "\n" );
}
public static void main( String args[] )
{
KeyDemo app = new KeyDemo();
app.addWindowListener( new WindowAdapter()
{
public void windowClosing( WindowEvent e )
{
System.exit( 0 );
}
} );
}
}
]]>