JAVA EE: Java : Collection Framework : TreeSet (SubSet)

Monday 5 January 2015

Java : Collection Framework : TreeSet (SubSet)

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TreeSetExample.java

import java.util.SortedSet;
import java.util.TreeSet;

/*
 * Example of subSet(E fromElement,E toElement) 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(10);
        treeSet.add(50);
        treeSet.add(60);
        treeSet.add(80);
        treeSet.add(70);

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

        /*
         * Returns a view of the portion of this set whose elements range from
         * fromElement, inclusive, to toElement, exclusive. (If fromElement and
         * toElement are equal, the returned set is empty.)
         * 
         * The returned set is backed by this set, so changes in the returned
         * set are reflected in this set, and vice-versa. The returned set
         * supports all optional set operations that this set supports.
         * 
         * Equivalent to subSet(fromElement, true, toElement, false).
         */

        SortedSet<Integer> sortedSet = treeSet.subSet(20, 60);

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

        sortedSet.remove(20);

        System.out.println("After removing element '20' in SortedSet \n");
        System.out.println("sortedSet : " + sortedSet);
        System.out.println("treeSet : " + treeSet + "\n");

    }
}

Output

treeSet : [10, 20, 30, 40, 50, 60, 70, 80]

sortedSet  : [20, 30, 40, 50]

--------------------------------------------

After removing element '20' in SortedSet 

sortedSet : [30, 40, 50]
treeSet : [10, 30, 40, 50, 60, 70, 80]