Java Proficiency: How to use retailAll in arraylist

Sunday 10 May 2015

Retains only the elements in this list that are contained in the specified collection. In other words, removes from this list all of its elements that are not contained in the specified collection.

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

public class RetainAll {

    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");
        arr.add("delhi");
        arr.add("INDIA");

        // print arraylist

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

        List<String> brr = new ArrayList<String>();

        brr.add("java");
        brr.add("shivam");

        /*
        * removes from arr all of its elements that are
        * not contained in the brr.
        */

        arr.retainAll(brr);

        System.out.println("After retainAll arr is="+arr);

    }

}

Output:

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

After retainAll arr is=[java]

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