First Swing steps

Create a file called simple_en_US.properties for the English version:

Title=English
File=File
Quit=Quit

Create a file called simple_fr_FR.properties for the French version:

Title=Français
File=Fichier
Quit=Quitter

IMPORTANT: Save the files in ISO-8859-1.

import java.awt.event.*;
import java.awt.*;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
public class SimpleNLS {
private static final ResourceBundle STRINGS = ResourceBundle.getBundle("simple");
public static String getString(String key) {
try {
return STRINGS.getString(key);
}
catch (MissingResourceException e) {
return '!' + key + '!';
}
}
public static void main(String[] args) {
ApplicationWindow appwin = new ApplicationWindow(getString("Title"));
appwin.setVisible(true);
}
static class ApplicationWindow extends Frame {
ApplicationWindow(String name) {
super(name);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Menu filemenu = new Menu(getString("File"), true);
MenuItem quit = new MenuItem(getString("Quit"));
quit.setShortcut(new MenuShortcut(quit.getLabel().charAt(0)));
quit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
filemenu.add(quit);
MenuBar menubar = new MenuBar();
menubar.add(filemenu);
setMenuBar(menubar);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int width = screenSize.width/3;
int height = screenSize.height/4;
int x = (screenSize.width - width) / 2;
int y = (screenSize.height - height) / 3;
setBounds(width, height, x, y);
setResizable(false);
}
}
}

$ javac SimpleNLS.java
$ java SimpleNLS

The run the program in another language, change the system properties user.language and user.country from the command-line:

$ java -Duser.language=fr -Duser.country=FR SimpleNLS

frasq.org