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()
