testchoices.java

来自「java2 primer plus一书源程序」· Java 代码 · 共 65 行

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

package com.samspublishing.jpp.ch13;
import java.awt.*;
import java.awt.event.*;

/**
 *
 * @author  Stephen Potts
 * @version
 */
public class TestChoices extends Frame implements ItemListener
{
   Choice clBread;
      
   TextField tField;
   
   /** Creates new TestChoices*/
   public TestChoices()
   {
      clBread = new Choice();
      clBread.add("White Bread");
      
      clBread.add("Wheat Bread");
      
      clBread.add("Rye Bread");
      clBread.addItemListener(this);
      
      tField = new TextField(30);
      
      setLayout(new FlowLayout());
      add(clBread);
      add(tField);
      
      addWindowListener(new WinCloser());
      setTitle("Using Choices");
      setBounds( 100, 100, 300, 300);
      setVisible(true);
   }
   
   public void itemStateChanged(ItemEvent ie)
   {
      Choice selBread = (Choice)ie.getItemSelectable();
      tField.setText("You selected " + selBread.getSelectedItem());
   }
   
   public static void main(String[] args)
   {
      TestChoices tc = new TestChoices();
   }
   
}

class WinCloser extends WindowAdapter
{
   public void windowClosing(WindowEvent e)
   {
      System.exit(0);
   }
}