combo.java

这是一个java程序

//GUI Swing组件：下拉式列表框显示图像文件
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Combo extends JFrame{
	private JComboBox images;
	private JLabel label;
	private String names[]={"福娃贝贝.jpg","福娃晶晶.jpg","福娃欢欢.jpg","福娃迎迎.jpg","福娃妮妮.jpg"};
	//创建图标对象数组，其对象文件名对应字符串数据对象names[];
	private Icon icons[]={new ImageIcon(names[0]),new ImageIcon(names[1]),
		new ImageIcon(names[2]),new ImageIcon(names[3]),new ImageIcon(names[4])};
	public Combo(){
		super("下拉式列表框显示图像文件！");
		Container c=getContentPane();
		c.setLayout(new FlowLayout());
		images=new JComboBox(names);
		images.setMaximumRowCount(3);
		images.addItemListener(new ItemListener(){
				public void itemStateChanged(ItemEvent e){
					label.setIcon(icons[images.getSelectedIndex()]);
				}
			});
	
		c.add(images);
		label=new JLabel(icons[0]);
		c.add(label);
		setSize(450,550);
		show();
	}
	public static void main(String args[]){
		Combo app=new Combo();
		app.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
			
			
		}
		);
	}
}