testjcheckboxes.java

java2 primer plus一书源程序

/*
 * TestCheckboxes.java
 *
 * Created on July 30, 2002, 2:36 PM
 */

package ch16;

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

/**
 *
 * @author  Stephen Potts
 * @version
 */
public class TestJCheckBoxes extends JFrame implements ItemListener
{
   JCheckBox cbWhiteBread;
   JCheckBox cbWheatBread;
   JCheckBox cbRyeBread;
   
   JCheckBox cbToasted;
   
   JTextField tField;
   
   /** Creates new TestJCheckBoxes*/
   public TestJCheckBoxes()
   {
      cbWhiteBread = new JCheckBox("White Bread");
      cbWhiteBread.addItemListener(this);
      
      cbWheatBread = new JCheckBox("Wheat Bread");
      cbWheatBread.addItemListener(this);
      
      cbRyeBread = new JCheckBox("Rye Bread");
      cbRyeBread.addItemListener(this);

      cbToasted= new JCheckBox("Toasted");
      cbToasted.addItemListener(this);
      
      tField = new JTextField(20);
      
      getContentPane().setLayout(new FlowLayout());
      getContentPane().add(cbWhiteBread);
      getContentPane().add(cbWheatBread);
      getContentPane().add(cbRyeBread);

      getContentPane().add(cbToasted);
      getContentPane().add(tField);
      
      this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      setTitle("Using JCheckBoxes");
      setBounds( 100, 100, 300, 300);
      setVisible(true);
   }
   
   public void itemStateChanged(ItemEvent ie)
   {
      JCheckBox cb = (JCheckBox)ie.getItemSelectable();
      if( cb.isSelected())
         tField.setText(cb.getText());
      else
         tField.setText("Not " + cb.getText());

   }
   
   public static void main(String[] args)
   {
      TestJCheckBoxes tcb = new TestJCheckBoxes();
   }
   
}