Java.util.ResourceBundle.keySet() Method

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Description

The java.util.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

Example

The following example shows the usage of java.util.ResourceBundle.keySet() method.

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 string array assigned to key "hello"
      System.out.println("" + bundle.getString("hello"));
      System.out.println("" + bundle.keySet());
   }
}

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!

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

Hello World!
[hello]