Localization ResourceBundle

MyMessages.java

public class MyMessages {
  private ResourceBundle bundle;
  
  public MyMessages(Locale locale) {
    this.bundle = ResourceBundle.getBundle("MyMessages", locale);
  }
  
  public String trains(Number arg0) {
    String pattern = bundle.getString("Trains");
    MessageFormat format = new MessageFormat(pattern);
    return format.format(new Object[]{arg0});
  }
  
  //more methods here...
}