LinkedList add() Method in Java (original) (raw)

Last Updated : 18 Dec, 2024

In Java, the add() method of the LinkedList class is used to add an element to the list. By default, it adds the element to the end of the list, if the index is not specified.

**Example: Here, we use the **add() method **to add a single element to the list.

Java `

// Java program to add elements in LinkedList import java.util.LinkedList;

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

    // Create a LinkedList
    LinkedList<Integer> l = new LinkedList<>();

    // Adding elements in 
    // the list
    l.add(100);

    System.out.println("" + l);
}

}

`

**Now there are two versions of LinkedList add() method i.e. one with the specified index and one without any specified index.

**1. public boolean add(E e)

Appends the element “**e” to the end of the list.

**Syntax:

public boolean add( E e)

• **Parameter: E represents the type of element that the LinkedList can store.
• **Return type: This method returns a boolean value.

Example: Here, we use the add() method **to add multiple elements to the LinkedList without specifying an index**.**

Java `

// Add elements without specified index import java.util.LinkedList;

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

    // Create a LinkedList
    LinkedList<Integer> l = new LinkedList<>();

    // Adding elements in 
    // the list
    l.add(100);
    l.add(200);
    l.add(300);
    l.add(400);
    l.add(500);
   
    System.out.println("The LinkedList is: " + l);
}

}

`

Output

The LinkedList is: [100, 200, 300, 400, 500]

**2. public boolean add(index , element)

Appends the element at the specified index in the LinkedList.

**Syntax:

list.add(index , element)

**Parameters:

• **index: Pass the index where you want to insert the element.
• **element: It is the object you want to add to the list.

Example: Here, we use the add() method **to add elements to the list with the specified index**.**

Java `

// Add elements with specified index import java.util.LinkedList;

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

    // Create a linkedlist
    LinkedList<Integer>l = new LinkedList<>();

    // Adding elements in 
    // the list
    l.add(100);
    l.add(200);
    l.add(400);
    System.out.println("LinkedList: " + l);

    l.add(2, 300);

    System.out.println("New LinkedList: " + l);
}

}

`

Output

LinkedList: [100, 200, 400] New LinkedList: [100, 200, 300, 400]