Java ResourceBundle getKeys() Method

Description

The java ResourceBundle getKeys() method returns an enumeration of the keys.

Declaration

Following is the declaration for java.util.ResourceBundle.getKeys() method

public abstract Enumeration<String> getKeys()

Parameters

NA

Return Value

This method returns an Enumeration of the keys contained in this ResourceBundle and its parent bundles.

Exception

NA

Getting Enumeration of All Keys from a Resource Bundle of US Locale

The following example shows the usage of Java ResourceBundle getKeys() method to print list of keys present in the properties file. We've created a resource bundle of US Locale for the corresponding hello_en_US.properties file. Then we printed the text assigned to key hello. Then the enumeration of keys is retrieved using getKeys() method and keys are printed.

package com.tutorialspoint;

import java.util.Enumeration;
import java.util.Locale;
import java.util.ResourceBundle;

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

      // create a new ResourceBundle with specified locale
      ResourceBundle bundle = ResourceBundle.getBundle("hello", Locale.US);

      // print the text assigned to key "hello"
      System.out.println("" + bundle.getString("hello"));

      // get the keys
      Enumeration<String> enumeration = bundle.getKeys();

      // print all the keys
      while (enumeration.hasMoreElements()) {
         System.out.println("" + enumeration.nextElement());
      }
   }
}

Output

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

hello = Hello World!
bye = Goodbye World!
morning = Good Morning World!

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

Hello World!
hello
bye
morning

Getting Enumeration of All Keys from a Resource Bundle of FRANCE Locale

The following example shows the usage of Java ResourceBundle getKeys() method to print list of keys present in the properties file. We've created a resource bundle of French Locale for the corresponding hello_fr_FR.properties file. Then we printed the text assigned to key hello. Then the enumeration of keys is retrieved using getKeys() method and keys are printed.

package com.tutorialspoint;

import java.util.Enumeration;
import java.util.Locale;
import java.util.ResourceBundle;

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

      // create a new ResourceBundle with specified locale
      ResourceBundle bundle = ResourceBundle.getBundle("hello", Locale.FRANCE);

      // print the text assigned to key "hello"
      System.out.println("" + bundle.getString("hello"));

      // get the keys
      Enumeration<String> enumeration = bundle.getKeys();

      // print all the keys
      while (enumeration.hasMoreElements()) {
         System.out.println("" + enumeration.nextElement());
      }
   }
}

Output

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

hello = Bonjour le monde!
bye = Au revoir le monde!
morning = Bonjour le monde!

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

Bonjour le monde!
hello
bye
morning

Getting Enumeration of All Keys from a Resource Bundle of GERMANY Locale

The following example shows the usage of Java ResourceBundle getKeys() method to print list of keys present in the properties file. We've created a resource bundle of German Locale for the corresponding hello_de_DE.properties file. Then we printed the text assigned to key hello. Then the enumeration of keys is retrieved using getKeys() method and keys are printed.

package com.tutorialspoint;

import java.util.Enumeration;
import java.util.Locale;
import java.util.ResourceBundle;

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

      // create a new ResourceBundle with specified locale
      ResourceBundle bundle = ResourceBundle.getBundle("hello", Locale.GERMANY);

      // print the text assigned to key "hello"
      System.out.println("" + bundle.getString("hello"));

      // get the keys
      Enumeration<String> enumeration = bundle.getKeys();

      // print all the keys
      while (enumeration.hasMoreElements()) {
         System.out.println("" + enumeration.nextElement());
      }
   }
}

Output

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

hello = Hallo Welt!
bye = Auf Wiedersehen Welt!
morning = Guten Morgen Welt!

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

Hallo Welt!
hello
bye
morning