Java.util.Resource Bundle.Control.toBundleName() Method



The java.util.ResourceBundle.Control.toBundleName(String baseName, Locale locale) method converts the given baseName and locale to the bundle name. This method is called from the default implementation of the newBundle and needsReload methods.


Following is the declaration for java.util.Control.toBundleName() method

public String toBundleName(String baseName, Locale locale)


  • baseName − the base bundle name of the resource bundle, a fully qualified class name

  • locale − the locale for which the resource bundle should be instantiated

Return Value

This method returns the bundle name for the resource bundle


NullPointerException − if baseName or locale is null


The following example shows the usage of java.util.ResourceBundle.Control.toBundleName() method.

package com.tutorialspoint;

import java.util.Locale;
import java.util.ResourceBundle;
import java.util.ResourceBundle.Control;

public class ResourceBundleControlDemo {
   public static void main(String[] args) {

      // create a new ResourceBundle.Control with default format
      ResourceBundle.Control rbc = ResourceBundle.Control.getControl(Control.FORMAT_DEFAULT);

      // print the name
      System.out.println("" + rbc.toBundleName("hello", Locale.US));

Assuming we have a resource file available in your CLASSPATH, with the following content. This file will be used as an input for our example program −

hello = Hello World!

Let us compile and run the above program, this will produce the following result −