AbstractSet isEmpty() method in Java with Example

Last Updated : 24 Dec, 2018
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 
// 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 
// 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
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