The java.util.SortedSet.isEmpty() method is used to check if a SortedSet is empty or not. It returns True if the SortedSet is empty otherwise it returns False.
Syntax:
boolean isEmpty()
Parameters: This method does not take any parameter.
Return Value: The method returns True if the SortedSet is empty else returns False.
Note: The isEmpty() method in SortedSet is inherited from the Set interface in Java.
Below program illustrate the java.util.SortedSet.isEmpty() method:
// Java code to illustrate isEmpty() import java.io.*;import java.util.*; public class SortedSetDemo { public static void main(String args[]) { // Creating an empty Set SortedSet<String> set = new TreeSet<String>(); // Use add() method to // add elements into the Set set.add("Welcome"); set.add("To"); set.add("Geeks"); set.add("4"); set.add("Geeks"); // Displaying the Set System.out.println("Set: " + set); // Check for the empty set System.out.println("Is the set empty? " + set.isEmpty()); // Clearing the set using clear() method set.clear(); // Again Checking for the empty set System.out.println("Is the set empty? " + set.isEmpty()); }} |
Output:
Set: [4, Geeks, To, Welcome] Is the set empty? false Is the set empty? true
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#isEmpty()
