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Java ResourceBundle keySet() Method with Example

ResourceBundle Class keySet() method: Here, we are going to learn about the keySet() method of ResourceBundle Class with its syntax and example.
Submitted by Preeti Jain, on March 24, 2020

ResourceBundle Class keySet() method

• keySet() method is available in java.util package.
• keySet() method is used to get all the existing keys from this ResourceBundle and its super bundles to be viewed in a Set.
• keySet() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• keySet() method does not throw an exception at the time of getting a key set.

Syntax:

    public Set keySet();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is Set, it returns Set view of all the existing keys in this ResourceBundle and its parent bundles.

Example:

// Java program to demonstrate the example 
// of Set keySet() method of ResourceBundle

import java.util.*;

public class KeySetOfResourceBundle {
 public static void main(String[] args) {
  // Instantiates ResourceBundle with
  // some locale
  ResourceBundle rb = ResourceBundle.getBundle("IncludeHelp...", Locale.JAPAN);

  // By using keySet() method is to
  // return the key set exists in
  // this rb or any of its parents
  Set s = rb.keySet();
  System.out.println("rb.keySet(): " + s);
 }
}

Output

rb.keySet(): [C,C++,JAVA,PHP]