Java.util.ResourceBundle.getKeys() Method

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Description

The java.util.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

Example

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

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());
      }
   }
}

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