testjradiobuttons.java

java2 primer plus一书源程序

/*
 * TestJRadioButtons.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 TestJRadioButtons extends JFrame implements ItemListener
{
   JRadioButton rbWhiteBread;
   JRadioButton rbWheatBread;
   JRadioButton rbRyeBread;
   
   JRadioButton rbToasted;
   
   ButtonGroup bg;
   
   JTextField tField;
   
   /** Creates new TestJRadioButtons*/
   public TestJRadioButtons()
   {
      rbWhiteBread = new JRadioButton("White Bread");
      rbWhiteBread.addItemListener(this);
      
      rbWheatBread = new JRadioButton("Wheat Bread");
      rbWheatBread.addItemListener(this);
      
      rbRyeBread = new JRadioButton("Rye Bread");
      rbRyeBread.addItemListener(this);

      rbToasted= new JRadioButton("Toasted");
      rbToasted.addItemListener(this);
      
      tField = new JTextField(20);
      
      bg = new ButtonGroup();
      bg.add(rbWhiteBread);
      bg.add(rbWheatBread);
      bg.add(rbRyeBread);
      
      getContentPane().setLayout(new FlowLayout());
      getContentPane().add(rbWhiteBread);
      getContentPane().add(rbWheatBread);
      getContentPane().add(rbRyeBread);

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

      setTitle("Using TestJRadioButtons");
      setBounds( 100, 100, 300, 300);
      setVisible(true);
   }
   
   public void itemStateChanged(ItemEvent ie)
   {
      JRadioButton rb = (JRadioButton)ie.getItemSelectable();
      tField.setText(rb.getText());
   }
   
   public static void main(String[] args)
   {
      TestJRadioButtons trb = new TestJRadioButtons();
   }
   
}