- Java.util Package Classes
- Java.util - Home
- Java.util - ArrayDeque
- Java.util - ArrayList
- Java.util - Arrays
- Java.util - BitSet
- Java.util - Calendar
- Java.util - Collections
- Java.util - Currency
- Java.util - Date
- Java.util - Dictionary
- Java.util - EnumMap
- Java.util - EnumSet
- Java.util - Formatter
- Java.util - GregorianCalendar
- Java.util - HashMap
- Java.util - HashSet
- Java.util - Hashtable
- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
- Java.util - LinkedList
- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
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]
To Continue Learning Please Login
Login with Google