Linked List Cheat Sheet in Java: A Comprehensive Guide

#DSA #DataStructures #Java
Linked lists are fundamental data structures in computer science and play a crucial role in various algorithms and applications. In Java, linked lists are implemented using the LinkedList class from the Java Collections framework. This blog post serves as a cheat sheet for understanding and working with linked lists in Java, providing a concise reference to their essential operations and concepts.

  1. Creating a Linked List:
    To create a linked list in Java, follow these steps:
LinkedList<String> linkedList = new LinkedList<>();
  1. Adding Elements:
    You can add elements to the linked list using the add() or addLast() methods:
linkedList.add("Apple");
linkedList.addLast("Banana");
  1. Accessing Elements:
    To access elements in a linked list, you can use the get() method, providing the index of the desired element:
String firstElement = linkedList.get(0);
  1. Removing Elements:
    Removing elements from a linked list can be done with the remove(), removeFirst(), or removeLast() methods:
linkedList.remove(0);
  1. Checking if the Linked List is Empty:
    To determine if a linked list is empty, use the isEmpty() method:
boolean isEmpty = linkedList.isEmpty();
  1. Finding the Size of the Linked List:
    To retrieve the size of the linked list, use the size() method:
int size = linkedList.size();
  1. Iterating Through the Linked List:
    You can iterate through a linked list using the enhanced for loop or an iterator:
for (String element : linkedList) {
    System.out.println(element);
}
  1. Converting a Linked List to an Array:
    To convert a linked list into an array, you can use the toArray() method:
String[] array = linkedList.toArray(new String[0]);
  1. Reversing a Linked List:
    To reverse the order of a linked list, you can use the Collections.reverse() method:
Collections.reverse(linkedList);
  1. Clearing the Linked List:
    To remove all elements from a linked list, use the clear() method:
linkedList.clear();

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