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