Collection: retainAll(Collection c) Removes from this collection every element that is not in c : Collection « Utility Classes « SCJP

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SCJP » Utility Classes » Collection

8.11.11.Collection: retainAll(Collection c) Removes from this collection every element that is not in c

import java.util.ArrayList;

import java.util.Collection;



public class MainClass {

  public static void main(String[] argv) {

    Collection c = new ArrayList();

    c.add("1");

    c.add("2");

    c.add("3");



    Collection c1 = new ArrayList();

    c1.add("1");



    c.retainAll(c1);



    System.out.println(c);



  }

}

[1]

8.11.Collection
	8.11.1.	The central interfaces of he Collections Framework are
	8.11.2.	Collection: add(Object x) Adds x to this collection
	8.11.3.	Collection: addAll(Collection c) Adds every element of c to this collection
	8.11.4.	Collection: clear() Removes every element from this collection
	8.11.5.	Collection: contains(Object x) Returns true if this collection contains x
	8.11.6.	Collection: containsAll(Collection c) Returns true if this collection contains every element of c
	8.11.7.	Collection: isEmpty() Returns true if this collection contains no elements
	8.11.8.	iterator() Returns an Iterator over this collection (see below)
	8.11.9.	Collection: remove(Object x) Removes x from this collection
	8.11.10.	Collection: removeAll(Collection c) Removes every element in c from this collection
	8.11.11.	Collection: retainAll(Collection c) Removes from this collection every element that is not in c
	8.11.12.	Collection: size() Returns the number of elements in this collection
	8.11.13.	Collection: toArray() Returns an array containing the elements in this collection

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