ArrayList vs LinkedList in Java
Java’s Collections Framework provides two commonly used List implementations: ArrayList and LinkedList . While both implement the List interface , they differ in their underlying data structures, performance, and use cases. Let’s break down their differences with examples and diagrams. 1. Underlying Structure ArrayList → Backed by a dynamic array. Elements are stored in contiguous memory . LinkedList → Implemented as a doubly-linked list. Each node stores data + pointers to the previous and next node. Diagram: ArrayList (Dynamic Array) [ 0 ] → [ 1 ] → [ 2 ] → [ 3 ] → [ 4 ] (index based access) LinkedList (Doubly Linked Nodes) NULL ← [0 | *] ↔ [1 | *] ↔ [2 | *] ↔ [3 | *] → NULL 2. Code Example ArrayList Example: import java.util.*; public class ArrayListExample { public static void main(String[] args) { List list = new ArrayList<>(); list.add("Java"); list.add("Python"); list.add("C+...