图片查看器

这几天一直在学习Java，在看《Java核心技术》这本书，书中有一个查看动态图片的小程序，写了一下，感觉还挺好使。正好自己电脑没有gif查看器，所以···收藏了。

代码如下：

import java.awt.*;
import java.io.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class ViewImage {
    public static void main(String args[])
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                JFrame frame = new ViewFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

class ViewFrame extends JFrame
{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    public ViewFrame()
    {
        setTitle("Image View");
        setSize(s_width,s_height);
        label = new JLabel();
        add(label);
        chooser = new JFileChooser();
        chooser.setCurrentDirectory(new File("."));
        JMenuBar menubar = new JMenuBar();
        setJMenuBar(menubar);
        JMenu menu = new JMenu("File");
        menubar.add(menu);
        
        JMenuItem openItem = new JMenuItem("Open");
        menu.add(openItem);
        openItem.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                int result = chooser.showOpenDialog(null);
                if(result == JFileChooser.APPROVE_OPTION)
                {
                    String name = chooser.getSelectedFile().getPath();
                    label.setIcon(new ImageIcon(name));
                }
            }
        });
        JMenuItem exitItem = new JMenuItem("Exit");
        menu.add(exitItem);
        exitItem.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                System.exit(0);
            }
        });
    }
    
    private JLabel label;
    private JFileChooser chooser;
    private static final int s_width = 300;
    private static final int s_height = 400;
}