example2.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

//package chapter15;

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

public class example2 extends JApplet
{
	private JPanel panel;
	private JLabel labelPhoto;
	private JComboBox cmbSelect;
	private String strPhotoName[]={"image1.gif","image2.gif","image3.gif"};	
	
	public void init()
	{
		panel=new JPanel();
		labelPhoto=new JLabel(new ImageIcon("image1.gif"));
		cmbSelect=new JComboBox(strPhotoName);
		
		cmbSelect.addActionListener(new ComboBoxListener());
		
		panel.add(labelPhoto);
		panel.add(cmbSelect);
		panel.setLayout(new FlowLayout(FlowLayout.CENTER,30,18));
		getContentPane().add(panel);
	}

	class ComboBoxListener implements ActionListener
	{
		public void actionPerformed(ActionEvent event)
		{		  
		  int iItem=cmbSelect.getSelectedIndex();
		  labelPhoto.setIcon(new ImageIcon(strPhotoName[iItem]));
		}
	}
}