TreeSet isEmpty() Method in Java

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.

Syntax:

Tree_Set.isEmpty()

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 
        tree.add("Welcome"); 
        tree.add("To"); 
        tree.add("Geeks"); 
        tree.add("4"); 
        tree.add("Geeks"); 
        tree.add("TreeSet"); 
  
        // 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 
        tree.clear(); 
  
        // Again Checking for the empty set 
        System.out.println("Is the set empty? " + tree.isEmpty()); 
    } 
} 

Output:

TreeSet: [4, Geeks, To, TreeSet, Welcome]
Is the set empty? false
Is the set empty? true

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