各位高手大侠,那个错误我后来检查了ImageViewer.java文件,修改后,再来执行java ImageViewer,报下面的错
D:Program FilesImageViewer>java ImageViewer
Exception in thread "main" java.lang.UnsupportedClassVersionError: ImageViewer (
Unsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
我的ImageViewer.java的文件应该没有问题,因为我在eclipse上来运行这个程序是可以成功的，现在就搞不懂为什么在cmd命令行里就出现这个情况,多谢指教!
修改后的ImageViewer.java文件如下:
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
/**
A program for viewing images.
*/
public class ImageViewer
{
public static void main(String[] args)
{
JFrame frame = new ImageViewerFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
/**
A frame with a label to show an image.
*/
class ImageViewerFrame extends JFrame
{
public ImageViewerFrame()
{
setTitle("ImageViewer");
setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
// use a label to display the images
label = new JLabel();
add(label);
// set up the file chooser
chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
// set up the menu bar
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)
{
// show file chooser dialog
int result = chooser.showOpenDialog(null);
// if file selected, set it as icon of the label
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 DEFAULT_WIDTH = 600;
private static final int DEFAULT_HEIGHT = 800;
}
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