jcomboboxdemo.java

Java课件,ppt格式

//JComboBoxDemo.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//Download by http://www.codefans.net
public class JComboBoxDemo extends JFrame implements ItemListener{
	private JComboBox imagesComboBox;
	private JLabel label;
	private Container container;
	private String names[]={"cry.gif","shy.gif","angry.gif","cool.gif"};
	private Icon icons[]={new ImageIcon(names[0]),new ImageIcon(names[1]),
	new ImageIcon(names[2]),	new ImageIcon(names[3])};
	
	public JComboBoxDemo()
	{
		super("JComboBox Test");
		container=getContentPane();
		container.setLayout(null);
		
		imagesComboBox=new JComboBox(names);
		imagesComboBox.setMaximumRowCount(4);
		imagesComboBox.addItemListener(this);
		
		imagesComboBox.setBounds(10,10,100,30);
		container.add(imagesComboBox);
		
		label=new JLabel(icons[0]);
		label.setBounds(110,0,80,100);
		container.add(label);
		
		setSize(200,150);
		setVisible(true);
		
	}
	
	public void itemStateChanged(ItemEvent event)
	{
		if(event.getStateChange()==ItemEvent.SELECTED)
			label.setIcon(icons[imagesComboBox.getSelectedIndex()]);
	}
	
	public static void main(String args[])
	{
		JComboBoxDemo application=new JComboBoxDemo();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			}
}