JAVA EE: Java : Collection Framework : TreeSet (Subset Inclusive)

Wednesday 7 January 2015

Java : Collection Framework : TreeSet (Subset Inclusive)

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TreeSetExample.java

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

/*
 * Example of subSet(E fromElement,
                    boolean fromInclusive,
                    E toElement,
                    boolean toInclusive) 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 to toElement.
         * 
         * If fromElement and toElement are equal, the returned set is empty
         * unless fromInclusive and toInclusive are both true.
         * 
         * 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.
         */

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

        System.out
                .println("fromInclusive and toInclusive are false , sortedSet  : "
                        + sortedSet + "\n");

        sortedSet = treeSet.subSet(20, true, 60, true);

        System.out
                .println("fromInclusive and toInclusive are true , sortedSet  : "
                        + sortedSet + "\n");

    }
}

Output

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

fromInclusive and toInclusive are false , sortedSet  : [30, 40, 50]

fromInclusive and toInclusive are true , sortedSet  : [20, 30, 40, 50, 60]