Java : Collection Framework : TreeSet (isEmpty)

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TreeSetExample.java

import java.util.TreeSet;

/*
 * Example of isEmpty() method.
 */
public class TreeSetExample
{
    public static void main( String[] args )
    {

        TreeSet<Integer> treeSet = new TreeSet<Integer>();
        
        System.out.println("treeSet : " + treeSet + "\n");
        
        /*
         * Returns true if this set contains no elements.
         */
        boolean isEmpty = treeSet.isEmpty();
        System.out.println("isEmpty :  " + isEmpty + "\n");


        treeSet.add(10);
        treeSet.add(50);
        treeSet.add(40);
        treeSet.add(20);
        treeSet.add(30);

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

        /*
         * Returns true if this set contains no elements.
         */
        isEmpty = treeSet.isEmpty();
        System.out.println("isEmpty :  " + isEmpty);
    }
}

Output

treeSet : []

isEmpty :  true

treeSet : [10, 20, 30, 40, 50]

isEmpty :  false

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

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