The isEmpty() method of AbstractSet in Java is used to check whether this AbstractSet is empty or not. It returns an boolean value stating the same.
Syntax:
public boolean isEmpty()
Parameters: This function has no parameters.
Returns: The method returns an boolean value which states that this instance of the AbstractSet is empty or not.
Below examples illustrates the AbstractSet.isEmpty() method:
Example 1:
// Java code to demonstrate the working of// isEmpty() method in AbstractSet import java.util.*; public class GFG { public static void main(String[] args) { // creating an AbstractSet AbstractSet<Integer> arr = new TreeSet<Integer>(); // using add() to initialize values // [1, 2, 3, 4] arr.add(1); arr.add(2); arr.add(3); arr.add(4); // print AbstractSet System.out.println("AbstractSet: " + arr); // Check if AbstractSet is empty // using isEmpty() value System.out.println("Is AbstractSet empty? " + arr.isEmpty()); }} |
Output:
AbstractSet: [1, 2, 3, 4] Is AbstractSet empty? false
Example 2:
// Java code to demonstrate the working of// isEmpty() method in AbstractSet import java.util.*; public class GFG { public static void main(String[] args) { // creating an AbstractSet AbstractSet<String> arr = new TreeSet<String>(); // print AbstractSet System.out.println("AbstractSet: " + arr); // Check if AbstractSet is empty // using isEmpty() value System.out.println("Is AbstractSet empty? " + arr.isEmpty()); }} |
Output:
AbstractSet: [] Is AbstractSet empty? true
