Java Proficiency: How to add all elements of a list to ArrayList

Sunday, 10 May 2015

How to add all elements of a list to ArrayList

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class AddAllElement {

    public static void main(String[] args) {

        ArrayList<String> arr = new ArrayList<String>();

        // add element in arraylist
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");

        // print arraylist
        System.out.println("arrayList is = " + arr);

        List<String> brr = new ArrayList<String>();
        brr.add("one");
        brr.add("second");

        //Appends all of the elements in the specified collection
        //to the end of this list, in the order that they are
        //returned by the specified collection's Iterator.
        arr.addAll(brr);

        System.out.println("After AddAll list brr ="+arr);

        List<String> linkList = new LinkedList<String>();
        linkList.add("Delhi");
        linkList.add("Kurukshetra");

        arr.addAll(linkList);

        System.out.println("After AddAll list linklist"+arr);
    }

}

Output:

arrayList is = [c, php, html, java]

After AddAll list brr =[c, php, html, java, one, second]

After AddAll list linklist[c, php, html, java, one, second, Delhi, Kurukshetra]

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