SortedSet isEmpty() method in Java with Examples (original) (raw)

Last Updated : 30 Sep, 2019

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 `

// 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 set = new TreeSet();

    // 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()

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