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AbstractCollection isEmpty() Method in Java with Examples

Last Updated : 11 Jul, 2025
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The isEmpty() method of Java AbstractCollection is used to check and verify if a Collection is empty or not. It returns True if the Collection is empty else it returns False. Syntax: 
AbstractCollection.isEmpty()
Parameters: The method does not take any parameter. Return Value: The function returns True if the collection is empty else it returns False. Below program illustrate the use of AbstractCollection.isEmpty() method: Program 1: Java 
// Java code to illustrate isEmpty() method

import java.util.*;
import java.util.AbstractCollection;

public class AbstractCollectionDemo {
    public static void main(String args[])
    {

        // Creating an empty Collection
        AbstractCollection<String>
            abs = new TreeSet<String>();

        // Use add() method to add
        // elements into the Collection
        abs.add("Welcome");
        abs.add("To");
        abs.add("Geeks");
        abs.add("4");
        abs.add("Geeks");
        abs.add("TreeSet");

        // Displaying the Collection
        System.out.println("Collection: " + abs);

        // Check for the empty collection
        System.out.println("Is the collection empty? "
                           + abs.isEmpty());

        // Clearing the collection
        // using clear() method
        abs.clear();

        // Again Checking for the empty collection
        System.out.println("Is the collection empty? "
                           + abs.isEmpty());
    }
}
Output: 
Collection: [4, Geeks, To, TreeSet, Welcome]
Is the collection empty? false
Is the collection empty? true
Program 2: Java 
// Java code to illustrate isEmpty() method

import java.util.*;
import java.util.AbstractCollection;

public class AbstractCollectionDemo {
    public static void main(String args[])
    {

        // Creating an empty Collection
        AbstractCollection<String>
            abs = new ArrayList<String>();

        // Use add() method to add
        // elements into the Collection
        abs.add("Welcome");
        abs.add("To");
        abs.add("Geeks");
        abs.add("4");
        abs.add("Geeks");
        abs.add("ArrayList");

        // Displaying the Collection
        System.out.println("Collection: " + abs);

        // Check for the empty collection
        System.out.println("Is the collection empty? "
                           + abs.isEmpty());

        // Clearing the collection using clear() method
        abs.clear();

        // Again Checking for the empty collection
        System.out.println("Is the collection empty? "
                           + abs.isEmpty());
    }
}
Output: 
Collection: [Welcome, To, Geeks, 4, Geeks, ArrayList]
Is the collection empty? false
Is the collection empty? true

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