Java : Collection Framework : ArrayList (Add Group of Objects)

Click here to watch in Youtube : https://www.youtube.com/watch?v=xlXzkTrsO44

ArrayListAddAllListExample.java

import java.util.ArrayList;

/*
 * Example of addAll(Collection<? extends E> c) method
 */
public class ArrayListAddAllListExample
{

    public static void main(String[] args)
    {
        ArrayList<String> arrayList1 = new ArrayList<String>();
        arrayList1.add("Ram");
        arrayList1.add("Dave");
        arrayList1.add("Peter");

        System.out.println("arrayList 1 : " + arrayList1);

        ArrayList<String> ArrayList2 = new ArrayList<String>();
        ArrayList2.add("Julia");
        ArrayList2.add("Akram");

        System.out.println("ArrayList 2 : " + ArrayList2);

        /*
         * Adding ArrayList2 collection elements to the arrayList1 collection
         */

        arrayList1.addAll(ArrayList2);

        System.out
                .println("After adding ArrayList2 collection elements to the arrayList1 collection ");

        System.out.println("arrayList 1 : " + arrayList1);

    }

}

Output

arrayList 1 : [Ram, Dave, Peter]
ArrayList 2 : [Julia, Akram]
After adding ArrayList2 collection elements to the arrayList1 collection 
arrayList 1 : [Ram, Dave, Peter, Julia, Akram]

ArrayListAddAllSetExample.java

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/*
 * Example of addAll(Collection<? extends E> c) method
 */
public class ArrayListAddAllSetExample
{

    public static void main(String[] args)
    {
        List<String> list = new ArrayList<String>();
        list.add("Ram");
        list.add("Dave");
        list.add("Peter");

        System.out.println("List : " + list);

        Set<String> set = new HashSet<String>();
        set.add("Julia");
        set.add("Akram");

        System.out.println("Set : " + set);

        /*
         * Adding Set collection elements to the list collection
         */

        list.addAll(set);

        System.out.println("List : " + list);

    }

}

Output

List : [Ram, Dave, Peter]
Set : [Julia, Akram]
List : [Ram, Dave, Peter, Julia, Akram]

To Download ArrayListDemoAddAll Project Click the below link

https://sites.google.com/site/javaee4321/java-collections/ArrayListDemoAddAll.zip?attredirects=0&d=1

See also:

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