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

AbstractSet isEmpty() method in Java with Example

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AbstractSet isEmpty() method in Java with Example

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