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AbstractCollection add() Method in Java with Examples

Last Updated : 11 Jul, 2025
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The add() method in Java AbstractCollection is used to add a specific element into a Collection. This method will add the element only if the specified element is not present in the Collection else the function will return False if the element is already present in the Collection. Syntax: 
AbstractCollection.add(Object element)
Parameters: The parameter element is of the object type and refers to the element to be added to the Collection. Return Value: The function returns True if the element is not present in the Collection otherwise False if the element is already present in the Collection. Below programs illustrate the AbstractCollection.add() method: Program 1: Adding String elements into the Collection of ArrayList. Java 
// Java code to illustrate add(Object o)

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

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

        // Create an empty collection
        AbstractCollection<Object>
            abs = new ArrayList<Object>();

        // Use add() method to add
        // elements in the collection
        abs.add("Welcome");
        abs.add("To");
        abs.add("Geeks");
        abs.add("4");
        abs.add("Geeks");

        // Displaying the Collection
        System.out.println("AbstractCollection: "
                           + abs);
    }
}
Output: 
AbstractCollection: [Welcome, To, Geeks, 4, Geeks]
Program 2: Adding Integer elements into the Collection of LinkedList. Java 
// Java code to illustrate add(Object o)

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

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

        // Create an empty collection
        AbstractCollection<Object>
            abs = new LinkedList<Object>();

        // Use add() method to add
        // elements in the collection
        abs.add(15);
        abs.add(20);
        abs.add(25);
        abs.add(30);
        abs.add(35);

        // Displaying the Collection
        System.out.println("AbstractCollection: "
                           + abs);
    }
}
Output: 
AbstractCollection: [15, 20, 25, 30, 35]

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