Java practice_1
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NO:1
public class helloworld {
public static void main(String[] args)
{
System.out.println("除了时间,什么都不属于我!");
}
}
NO:2
public class Welcome {
public static void main(String[] args)
{
// TODO Auto-generated method stub
String[] greeting = new String[3];
greeting[0] = "Welcome to Core Java";
greeting[1] = "bye Cay Horstmann";
greeting[2] = "and Gary Cornell";
for (String g : greeting)
System.out.println(g);
}
}
NO:3
import java.awt.EventQueue;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
/**
* 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()
{
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;
}
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