innerclasstest.java

《Java面向对象程序设计》例子源代码.轻松学习书本.

//InnerClassTest.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class InnerClassTest extends JFrame {
   private String name;
   private JLabel nameLabel;
   private JTextField nameField,displayField;
   private JButton exitButton;
   public InnerClassTest(){
      super( "Inner Class Demonstration" );   
      Container container = getContentPane();  
      container.setLayout( new FlowLayout() );  
      nameLabel = new JLabel( "姓名" );
      nameField = new JTextField( 20 );
      container.add( nameLabel );
      container.add( nameField );
      displayField = new JTextField( 30 );
      displayField.setEditable( false );
      container.add( displayField );
      exitButton = new JButton( "Exit" );
      container.add( exitButton );
      ActionEventHandler handler = new ActionEventHandler();
      nameField.addActionListener( handler ); 
      exitButton.addActionListener( handler );
   } 
   public void displayName(){
      displayField.setText( "姓名是: " + name );
   }
   public static void main( String args[] ){
      InnerClassTest window = new InnerClassTest();
      window.setSize( 400, 140 );
      window.setVisible( true );

   } 
   private class ActionEventHandler implements ActionListener {
      public void actionPerformed( ActionEvent event )
      {
         if ( event.getSource() == exitButton )
            System.exit( 0 );   
         else if ( event.getSource() == nameField ) {
         	name=event.getActionCommand();         	
			nameField.setText("");
         }
         displayName();  
      } 
   } 
}