NavigableSet isEmpty() method in Java
The java.util.NavigableSet.isEmpty() method is used to check if a NavigableSet is empty or not. It returns True if the NavigableSet 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 NavigableSet is empty else returns False.
Below program illustrate the java.util.NavigableSet.isEmpty() method:
// Java code to illustrate isEmpty()import java.io.*;import java.util.*; public class NavigableSetDemo { public static void main(String args[]) { // Creating an empty NavigableSet NavigableSet<String> st = new TreeSet<String>(); // Use add() method to add elements into // the NavigableSet st.add("Welcome"); st.add("To"); st.add("Geeks"); st.add("4"); st.add("Geeks"); // Displaying the NavigableSet System.out.println("NavigableSet: " + st); // Check for the empty NavigableSet System.out.println("Is the NavigableSet empty? " + st.isEmpty()); // Clearing the NavigableSet using clear() method st.clear(); // Again Checking for the empty NavigableSet System.out.println("Is the NavigableSet empty? " + st.isEmpty()); }} |
Output:
NavigableSet: [4, Geeks, To, Welcome] Is the NavigableSet empty? false Is the NavigableSet empty? true
