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.
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
// 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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