import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.text.*;

public class International extends JFrame
    implements ActionListener
{
  JLabel aLabel;
  JLabel vLabel;
  JCheckBox aCheckbox;
  JButton aButton;
  JButton vButton;
  JTextField aTextField;
  NumberFormat nf;

  public void initGUI(){
    setLayout(new FlowLayout());

    // String
    aLabel = new JLabel
      (MyResources.rb.getString("aLabel"));
    add(aLabel);

    // Object
    aCheckbox =
      (JCheckBox)MyResources.rb.getObject("aCheckbox");
    add(aCheckbox);

    // String concatenation with MessageFormat
    Date d = new Date();
    MessageFormat mf = new MessageFormat
       (MyResources.rb.getString("aButton"));
    aButton = new JButton
      (mf.format(new Object [] { d }));
    add(aButton);

    // Number format output
    double dn = 3.1416;
    nf = (NumberFormat)
      (MyResources.rb.getObject("aNumber"));
    aTextField = new JTextField(6);
    add(aTextField);
    aTextField.setText(nf.format(dn));

    // Number input validation
    vButton =
      (JButton)MyResources.rb.getObject("vButton");
    add(vButton);
    vButton.addActionListener(this);

    vLabel = new JLabel("validation message ...");
    add(vLabel);

    setSize(400,400);
  }

  public void actionPerformed(ActionEvent ae) {
    if (ae.getSource() == vButton) {
       try {
         nf.parse(aTextField.getText());
         vLabel.setText(MyResources.rb.getString("numOK"));
         vLabel.invalidate();
         this.validate();
       }
       catch (ParseException pe) {
         pe.printStackTrace();
         vLabel.setText(MyResources.rb.getString("numERR"));
         vLabel.invalidate();
         this.validate();
       }
    }
  }

  public static void  main(String args[]) {
      System.out.println("Current Local : " + Locale.getDefault());
      Thread t = new Thread () {
          public void run() {
              International frame = new International();
              frame.initGUI();
              frame.setVisible(true);
          }
      };

      SwingUtilities.invokeLater(t);
  }
}

import java.util.*;
import javax.swing.*;
import java.text.*;

public class MyResources extends ListResourceBundle {
  public static ResourceBundle rb =
    ResourceBundle.getBundle("MyResources");

  public Object [][] getContents() {
    return contents;
  }

  static final Object[][] contents =  {
       { "myLabel" , "A Label" } ,
       { "aCheckbox", new JCheckBox("Yes") } ,
       { "aButton"  , "Today {0,date,long}"},
       { "aNumber"  , new DecimalFormat("0.####")},
       { "vButton"  , new JButton("Validate number")},
       { "numOK"       , "Valid!" },
       { "numERR"      , "Invalid"}
  };
}

import java.util.*;

public class MyResources_en extends ListResourceBundle {
  public Object [][] getContents() {
    return contents;
  }
  static final Object[][] contents =  {
    { "aLabel"     , "a Label (en)" }
  };
}

import java.util.*;
import javax.swing.*;

public class MyResources_fr extends ListResourceBundle {
  public Object [][] getContents() {
    return contents;
  }

  static final Object[][] contents =  {
    { "aLabel"     , "une étiquette (fr)" } ,
    { "aCheckbox", new JCheckBox("Oui (fr)")} ,
    { "vButton" , new JButton("Validation du nombre")},
    { "numOK" , "Valide!"},
    { "numERR", "Invalide"}
  };
}

import java.util.*;

public class myResources_fr_CA extends ListResourceBundle {
  public Object [][] getContents() {
    return contents;
  }

  static final Object[][] contents =  {
    { "aLabel"     , "une étiquette (fr CA)" } ,
  };
}