Introduction
Welcome to the world of linked lists in Java, where data organization takes on a whole new level of magic! As a Java programmer, understanding and use of the power of linked lists is essential for unlocking the full potential of your programs. Whether you're just starting out or looking to level up your skills. From the basics of linked list implementation to advanced operations and performance considerations to create and manipulate linked lists, perform common operations like insertion and deletion, traverse and update elements, and even tackle more complex tasks like reversing the list or merging two lists together. But why choose linked lists over other data structures like arrays? We'll explore the advantages and disadvantages of linked lists.
Understanding
Definition: A linked list is a linear data structure consisting of a sequence of elements called nodes. Each node contains two fields: the values it holds, and an address or link to the next node in the sequence.
Types:
Singly Linked List: Each node stores the values and an address to the next node. The last node points to null. This structure is for forward traversal only.
Doubly Linked List: Each node has both an address to the next node and an address to the previous node. This bidirectional traversal in both forward and backward directions.
Circular Linked List: The last node in the list points back to the first node, forming a circular loop.
Basic operation: Insertion, Deletion, Searching, Traversing, Updating.
Advanced Operation: Reversing, Merging, Finding.
Advantages
Dynamic Size: Linked lists have a dynamic size, i.e. they can grow or shrink in size during runtime without the need for preallocation.
Insertion and Deletion: Insertion and deletion operations can be performed efficiently in linked lists. Unlike arrays, where elements may need to shift to accommodate new or removed elements.
Memory Efficiency: Linked lists use memory efficiently as they only allocate memory for each individual node as needed.
No Memory Wastage: Linked lists prevent memory wastage by using exactly the required amount of memory for each node.
Implementation
The below steps are to create your own LinkedList
Create a Node class: Create a Node class with attributes like val which is datatype Integer and Node datatype for the next attribute. Initiate with a constructor.
Create LinkedList class: Implement the insertion method, Deletion method and get method.
Display: To display the linked use Iterator operations.
To create /use LinkedList in your program
Create a LinkedList class with Datatype you want to insert.
Use the method that is present in the LinkedList class.
for Example:
import java.util.LinkedList;
public class Main {
public static void main(String[] args) {
// Create a linkedList
LinkedList<String> link = new LinkedList<>();
// Add elements to the linkedList
link.add("A");
link.add("B");
link.add("C");
// Display the elements of the linkedList
System.out.println("linkedList: " + link);
// Insert an element at the beginning
link.addFirst("M");
// Insert an element at the end
link.addLast("O");
// Displaying the elements of the linkedList
System.out.println("linkedList: " + link);
// Remove an element from the linkedList
link.remove("B");
// Remove the first and last elements
link.removeFirst();
link.removeLast();
// Display the updated elements of the linkedList
System.out.println("Updated link: " + link);
// Getting elements in the linkedList
System.out.println("First element: " + link.getFirst());
System.out.println("Last element: " + link.getLast());
// Checking if the linkedList contains an element
System.out.println("Contains C? " + link.contains("C"));
// Size of the linkedList
System.out.println("Size of the linkedList: " + link.size());
}
}
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