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TreeSet isEmpty() Method in Java

  • Difficulty Level : Easy
  • Last Updated : 26 Nov, 2018

The Java.util.TreeSet.isEmpty() method is used to check and verify if a TreeSet is empty or not. It returns True if the TreeSet is empty else it returns False.



Parameters: The method does not take any parameter

Return Value: The function returns True if the set is empty else it returns False.

Below program illustrate the use of Java.util.TreeSet.isEmpty() method:

// Java code to illustrate isEmpty() method
import java.util.*;
import java.util.TreeSet;
public class TreeSetDemo {
    public static void main(String args[])
        // Creating an empty HashSet
        TreeSet<String> tree = new TreeSet<String>();
        // Use add() method to add elements into the Set
        // Displaying the TreeSet
        System.out.println("TreeSet: " + tree);
        // Check for the empty set
        System.out.println("Is the set empty? " + tree.isEmpty());
        // Clearing the set using clear() method
        // Again Checking for the empty set
        System.out.println("Is the set empty? " + tree.isEmpty());
TreeSet: [4, Geeks, To, TreeSet, Welcome]
Is the set empty? false
Is the set empty? true

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