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

Last Updated : 31 Dec, 2018

The java.util.Set.isEmpty() method is used to check if a Set is empty or not. It returns True if the Set is empty otherwise it returns False.Syntax:

boolean isEmpty()

Parameters: This method does not take any parameterReturn Value: The method returns True if the set is empty else returns False. Below program illustrate the java.util.Set.isEmpty() method:

Java `

// Java code to illustrate isEmpty() import java.io.; import java.util.;

public class SetDemo { public static void main(String args[]) { // Creating an empty Set Set set = new HashSet();

    // 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, Welcome, To] Is the set empty? false Is the set empty? true

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#isEmpty()

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

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