Linked Lists

In the world of programming, linked lists are an important data structure to understand. They provide a way to store and manipulate a collection of elements with each element containing a reference to the next element in the list.

As a senior engineer with experience in Java, Spring Boot, and MySQL, you may have encountered linked lists in your coding journey. Linked lists consist of nodes, where each node contains two fields: the data and a reference (or pointer) to the next node in the list.

LinkedList class in Java

In Java, the LinkedList class provides an implementation of a doubly-linked list. Let's see an example of how to use the LinkedList class:

1// Create a linked list
2LinkedList<String> linkedList = new LinkedList<>();
3
4// Add elements to the linked list
5linkedList.add("Apple");
6linkedList.add("Banana");
7linkedList.add("Cherry");
8
9// Get the size of the linked list
10int size = linkedList.size();
11System.out.println("The size of the linked list is: " + size);
12
13// Check if the linked list is empty
14boolean isEmpty = linkedList.isEmpty();
15System.out.println("Is the linked list empty? " + isEmpty);

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class Main {

  public static void main(String[] args) {

    // Create a linked list

    LinkedList<String> linkedList = new LinkedList<>();

    // Add elements to the linked list

    linkedList.add("Apple");

    linkedList.add("Banana");

    linkedList.add("Cherry");

    // Get the size of the linked list

    int size = linkedList.size();

    System.out.println("The size of the linked list is: " + size);

    // Check if the linked list is empty

    boolean isEmpty = linkedList.isEmpty();

    System.out.println("Is the linked list empty? " + isEmpty);

  }

}