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Java LinkedList offerFirst() Method

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Java LinkedList offerFirst() Method

Image 3: Java LinkedList Java LinkedList

The offerFirst() method is a convenient method provided by the LinkedList class in Java, used to insert the specified element at the front (head) of the linked list. This method is part of the Deque (double-ended queue) interface, which the LinkedList class implements.

Method Syntax

public boolean offerFirst(E e)

Method Parameters

Parameter	Type	Description
e	E	The element to be added to the head of the linked list

Return Value

This method always returns true, because LinkedList can grow dynamically and can theoretically add elements infinitely (limited by memory size).

Method Characteristics

Non-blocking operation: Unlike addFirst(), offerFirst() does not throw exceptions
Unlimited capacity: LinkedList has no fixed capacity limit
Efficient operation: The time complexity for inserting elements at the head of the linked list is O(1)

Usage Example

Example

import java.util.LinkedList;

public class OfferFirstExample {

    public static void main(String[] args){

        // Create a LinkedList
        LinkedList fruits = new LinkedList();

        // Add elements using offerFirst()
        fruits.offerFirst("Apple");
        fruits.offerFirst("Banana");
        fruits.offerFirst("Cherry");

        // Display the list
        System.out.println("LinkedList: " + fruits);

        // Result:
        // LinkedList: [Cherry, Banana, Apple]
    }
}

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