Java : Collection Framework : Collections (addAll Hashset)

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CollectionsExample.java

import java.util.Collections;
import java.util.HashSet;

/*
 *  Example of addAll(Collection<? super T> c,
                                    T... elements) method
 */

public class CollectionsExample
{

    public static void main(String[] args)
    {
        HashSet<String> hashSet = new HashSet<String>();

        hashSet.add("Ajay");
        hashSet.add("Vijay");
        hashSet.add("David");

        System.out.println("hashSet : " + hashSet + "\n");

        String[] namesArray =
        { "Ajay", "Karan", "Julia" };

        /*
         * Adds all of the specified elements to the specified collection.
         * Elements to be added may be specified individually or as an array
         * 
         * Returns: true if the collection changed as a result of the call
         */
        boolean isAdded = Collections.addAll(hashSet, namesArray);

        System.out.println("isAdded : " + isAdded + "\n");

        System.out.println("hashSet : " + hashSet + "\n");
    }

}

Output

hashSet : [Vijay, David, Ajay]

isAdded : true

hashSet : [Julia, Vijay, Karan, David, Ajay]

To Download CollectionsDemoAddAllHashSet Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/CollectionsDemoAddAllHashSet.zip?attredirects=0&d=1

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