java swing 图片展示器

打开软件选择图片目录：然后点击屏幕自动切换。

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;


public class ImageViewer {


public static void main(String[] args) {
JFrame frame = new ImageVieweFrame();
frame.setTitle("ImageView");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}


}


class ImageVieweFrame extends JFrame {


/**
* 
*/
private static final long serialVersionUID = 1L;
private JLabel label;
private JFileChooser chooser;
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 300;
private File file = null;
private static int num = 0;


public ImageVieweFrame() {


this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
label = new JLabel();
this.add(label);


this.addMouseListener(new MouseAdapter() {


@SuppressWarnings("unchecked")
@Override
public void mouseClicked(MouseEvent e) {
if (file == null) {
System.out.println("clicked");
} else {
String dirctory = file.getParent();
if (dirctory.isEmpty()) {
System.out.println("dirctory is empty");
}
File file = new File(dirctory);
if (file.isDirectory()) {


File[] files = file.listFiles();
@SuppressWarnings("rawtypes")
List list = new ArrayList<>();
for (int i = 0; i < files.length; i++) {
if (files[i].getName().endsWith(".jpg")) {
list.add(files[i].getPath());
}
}
if (num != files.length - 1) {
System.out.println();
label.setIcon(new ImageIcon((String) list.get(num)));
num++;
} else {
num = 0;
label.setIcon(new ImageIcon((String) list.get(num)));
}
}
}
}
});


// set up the file chooser
chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));


//
JMenuBar menuBar = new JMenuBar();
this.setJMenuBar(menuBar);


JMenu menu = new JMenu("File");
menuBar.add(menu);


JMenuItem openItem = new JMenuItem("Open");
menu.add(openItem);


openItem.addActionListener(new ActionListener() {


@Override
public void actionPerformed(ActionEvent e) {
int result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {


file = chooser.getSelectedFile();


String name = file.getPath();


label.setIcon(new ImageIcon(name));
}
}
});
JMenuItem exItem = new JMenuItem("Exit");
menu.add(exItem);


exItem.addActionListener(new ActionListener() {


@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});


}


}