jcomboboxtest.java

GUI代码,用与实现相关GUI的功能,如有需要即可自由下载!

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


public class JComboBoxTest extends JFrame {
	private JComboBox imagesComboBox;
	private JLabel label;
	private String []names = {"1.gif","2.gif","3.gif","4.gif"};
	private Icon icons[] = {new ImageIcon(names[0]),new ImageIcon(names[1]),
			    new ImageIcon(names[2]),new ImageIcon(names[3])};
	/**
	 * Launch the application
	 * @param args
	 */
	public static void main(String args[]) {
		try {
			JComboBoxTest frame = new JComboBoxTest();
			frame.setVisible(true);
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the frame
	 */
	public JComboBoxTest() {
		super("JComboBox Test");
		
		Container container = getContentPane();
		container.setLayout(new FlowLayout());
		
		imagesComboBox = new JComboBox(names) ;
		imagesComboBox.setMaximumRowCount(3);
		
		imagesComboBox.addItemListener(new ItemListener(){
				public void itemStateChanged(ItemEvent event){
					if(event.getStateChange()==ItemEvent.SELECTED)
						label.setIcon(icons[imagesComboBox.getSelectedIndex()]);
				}			
		});
		container.add(imagesComboBox);
		label = new JLabel(icons[0]);
		container.add(label);
		
		setSize(800,600);
		
	}

}