testjlists.java

java2 primer plus一书源程序

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

package ch16;

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

/**
 *
 * @author  Stephen Potts
 * @version
 */
public class TestJLists extends JFrame implements ListSelectionListener
{
    JList lstBread;
    
    JTextField tField;
    
    /** Creates new TestJLists*/
    public TestJLists()
    {
        String[] names = {"White Bread", "Wheat Bread", "Rye Bread"};
        
        lstBread = new JList(names);
 
        lstBread.addListSelectionListener(this);
        
        tField = new JTextField(" ",20);
        
        getContentPane().setLayout(new FlowLayout());
        getContentPane().add(lstBread);
        getContentPane().add(tField);
        
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        setTitle("Using JLists");
        setBounds( 100, 100, 300, 300);
        setVisible(true);
    }
    
    public void valueChanged(ListSelectionEvent lse)
    {
        String selection = "";
        if (lse.getValueIsAdjusting())
        {
            return;
        }
        
        int[] selected = lstBread.getSelectedIndices();
        for(int i=0; i < selected.length; ++i)
        {
            selection = selection + " " +
               (String) lstBread.getModel().getElementAt(selected[i]);
            tField.setText(selection);
        }
        
    }
    
    public static void main(String[] args)
    {
        TestJLists tc = new TestJLists();
    }
    
}