debug13_4.java

程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件

package questions.c13;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Debug13_4 extends JFrame {
   public Debug13_4( String titleText ) {
      super( titleText );
      addWindowListener( new WindowAdapter() {
            public void windowClosing( WindowEvent e ) {
               e.getWindow().dispose();
               System.exit( 0 );
            }
         }
      );
      final JTextField tf = new JTextField( 40 );
      tf.addListener( new Listener() {
            public void eventHappened( Event e ) {
               tf.setText( tf.getText().toUpperCase() );
            }
         }
      );
      getContentPane().add( tf, BorderLayout.NORTH );
      pack();
      setVisible( true );
   }
   public static void main( String[] args ) {
      new Debug13_4( "Debug Question" );
   }
}