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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 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

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