BE THE CODER > Tools and Libs > Google Guava Examples > Collections

Google Guava is a java library with lot of utilities and reusable components. This requires the library guava-10.0.jar to be in classpath. The following example shows using ImmutableSet class. It returns an immutable set implementation which doesn't allow null elements.

File Name :	com/bethecoder/tutorials/guava/collection_tests/ImmutableSetTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.guava.collection_tests;



import java.util.Arrays;

import java.util.List;



import com.google.common.collect.ImmutableSet;



public class ImmutableSetTest {



  /**

   * @param args

   */

  public static void main(String[] args) {

    ImmutableSet<String> stringSet = ImmutableSet.of("ONE", "TWO", "THREE", "FOUR");

    System.out.println(stringSet);

    

    List<Integer> ints = Arrays.asList(1, 2, 2, 3, 3, 3, 4, 4, 4, 4);

    ImmutableSet<Integer> intSet = ImmutableSet.copyOf(ints.iterator());

    System.out.println(intSet);

  }



}

Immutable Set