AbstractSet isEmpty() method in Java with Example

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