Java : Collection Framework : TreeSet (RetainAll)

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TreeSetExample.java

import java.util.LinkedList;
import java.util.TreeSet;

/*
 * Example of retainAll(Collection<?> c) method.
 */
public class TreeSetExample
{
    public static void main( String[] args )
    {

        TreeSet<Integer> treeSet = new TreeSet<Integer>();

        treeSet.add(40);
        treeSet.add(20);
        treeSet.add(30);
        treeSet.add(100);
        treeSet.add(200);

        System.out.println("treeSet : " + treeSet + "\n");

        LinkedList<Integer> linkedList = new LinkedList<Integer>();
        
        linkedList.add(100);
        linkedList.add(200);

        System.out.println("linkedList : " + linkedList + "\n");

        /*
         * Retains only the elements in this set that are contained in the
         * specified collection (optional operation). In other words, removes
         * from this set all of its elements that are not contained in the
         * specified collection.
         * 
         * If the specified collection is also a set, this operation effectively
         * modifies this set so that its value is the intersection of the two
         * sets.
         */

        boolean isRetained = treeSet.retainAll(linkedList);

        System.out.println("isRetained : " + isRetained);
        System.out.println("treeSet : " + treeSet + "\n");
    }
}

Output

treeSet : [20, 30, 40, 100, 200]

linkedList : [100, 200]

isRetained : true
treeSet : [100, 200]

To Download TreeSetDemoRetainAll Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeSetDemoRetainAll.zip?attredirects=0&d=1

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