LinkedList boolean retainAll(Collection c) method Example Program

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

Program

package com.candidjava;

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

/* 
 * @author : Mohan 
 * @description : RetailAll program to retain only elements specified in the specified collection.
 * 
 */
public class LinkedListRetainAll {
	public static void main(String[] args) {
		LinkedList<String> ll = new LinkedList<String>();
		ll.add("hari");
		ll.add("mohan");
		ll.add("anand");
		ll.add("saravan");
		ll.add("sampath");
		ll.add("kumar");
		ArrayList<String> al = new ArrayList<String>();
		al.add("anand");
		al.add("sampath");
		al.add("ram");
		System.out.println("linkedlist" + ll);
		System.out.println("Arraylist" + al);
		ll.retainAll(al);
		al.retainAll(ll);
		System.out.println("linkedlist after using retainall" + ll);
		System.out.println("arraylist after using retainall" + al);
	}
}

Output

Explanation

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