Java ResourceBundle keySet() Method

---

---

Description

The java ResourceBundle keySet() method returns a Set of all keys contained in this ResourceBundle and its parent bundles.

Declaration

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

 public Set<String> keySet() 

Parameters

NA

Return Value

This method returns a Set of all keys contained in this ResourceBundle and its parent bundles.

Exception

NA

Getting Set of Keys from a Properties File of US Locale

The following example shows the usage of Java ResourceBundle keySet() method to print a set 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 set of keys is retrieved using keySet() method and is printed.

 package com.tutorialspoint; 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 System.out.println(bundle.keySet()); } } 

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 Set of Keys from a Properties File of FRANCE Locale

The following example shows the usage of Java ResourceBundle keySet() method to print a set 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 set of keys is retrieved using keySet() method and is printed.

 package com.tutorialspoint; 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 System.out.println(bundle.keySet()); } } 

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 Set of Keys from a Properties File of GERMAN Locale

The following example shows the usage of Java ResourceBundle keySet() method to print a set 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 set of keys is retrieved using keySet() method and is printed.

 package com.tutorialspoint; 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.GERMAN); // print the text assigned to key "hello" System.out.println(bundle.getString("hello")); // get the keys System.out.println(bundle.keySet()); } } 

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 −

 Hello World! [hello, bye, morning]