timetestwindow.java

《Java面向对象程序设计》例子源代码.轻松学习书本.

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

public class TimeTestWindow extends JFrame {
   private Time time;
   private JLabel hourLabel, minuteLabel, secondLabel;
   private JTextField hourField, minuteField, secondField, displayField;
   private JButton exitButton;
   public TimeTestWindow(){
      super( "Inner Class Demonstration" );  
      time = new Time();  
      Container container = getContentPane();  
      container.setLayout( new FlowLayout() );  
      hourLabel = new JLabel( "Set Hour" );
      hourField = new JTextField( 10 );
      container.add( hourLabel );
      container.add( hourField );
      minuteLabel = new JLabel( "Set Minute" );
      minuteField = new JTextField( 10 );
      container.add( minuteLabel );
      container.add( minuteField );
      secondLabel = new JLabel( "Set Second" );
      secondField = new JTextField( 10 );
      container.add( secondLabel );
      container.add( secondField );
      displayField = new JTextField( 30 );
      displayField.setEditable( false );
      container.add( displayField );
      exitButton = new JButton( "Exit" );
      container.add( exitButton );

      // create an instance of inner class ActionEventHandler
      ActionEventHandler handler = new ActionEventHandler();
      hourField.addActionListener( handler ); 
      minuteField.addActionListener( handler );
      secondField.addActionListener( 
      	new ActionListener(){
      		public void actionPerformed(ActionEvent event){
      			time.setSecond(Integer.parseInt(event.getActionCommand()));
      			secondField.setText("");
      			displayTime();
      		}
      	} );
      exitButton.addActionListener( handler );
   } 
   public void displayTime(){
      displayField.setText( "The time is: " + time );
   }
   public static void main( String args[] ){
      TimeTestWindow window = new TimeTestWindow();
      window.setSize( 400, 140 );
      window.setVisible( true );

   } 

   // inner class declaration for handling JTextField and JButton events
   private class ActionEventHandler implements ActionListener {
      public void actionPerformed( ActionEvent event )
      {
         if ( event.getSource() == exitButton )
            System.exit( 0 );   
         else if ( event.getSource() == hourField ) {
            time.setHour( Integer.parseInt( 
               event.getActionCommand() ) );
            hourField.setText( "" );
         }
         else if ( event.getSource() == minuteField ) {
            time.setMinute( Integer.parseInt( 
               event.getActionCommand() ) );
            minuteField.setText( "" );
         }
         displayTime();  // call outer class's method
      } 
   } 
}