我把程序后面的复杂的部分全部去掉 编译 运行 结束 然后在 命令行里输入 type ImageViewer.log 显示找不到文件啊 mport java.awt.EventQueue; import java.awt.event.*; import java.io.*; import javax.swing.*; import java.util.logging.*;/** * A program for viewing images. * @version 1.22 2007-05-21 * @author Cay Horstmann */ public class ImageViewer { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { Logger.getLogger("com.houstmann.corejava").setLevel(Level.ALL); 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 = 300; private static final int DEFAULT_HEIGHT = 400; } 把程序关于日志的代码 只保留了一行
mport java.awt.EventQueue;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import java.util.logging.*;/**
* A program for viewing images.
* @version 1.22 2007-05-21
* @author Cay Horstmann
*/
public class ImageViewer
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
Logger.getLogger("com.houstmann.corejava").setLevel(Level.ALL);
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 = 300;
private static final int DEFAULT_HEIGHT = 400;
}
把程序关于日志的代码 只保留了一行
C:/用户/Admin... 那个文件夹里,文件名是LoggingImageViewer.log
我是这句看不懂。。
if (System.getProperty("java.util.logging.config.class") == null
&& System.getProperty("java.util.logging.config.file") == null)为啥判断这个