List in Java

What is a List? List is an interface in the Java Collection Framework that stores an ordered collection of elements and allows duplicates, and elements can be accessed by their index. *Maintains insertion order. *Allows duplicate elements. *Supports index-based access. Why List? -1. Order is Important Data should maintain insertion order. Duplicates Are Allowed Example: Same product added twice in the cart. Index-Based Access Needed You can access elements using an index: When List? When the number of elements is unknown When duplicates are allowed When we need ordered data When we need index-based operations *** Real-Time Examples E-commerce Cart Use List → Products in cart (order matters) Student Marks Store multiple marks (duplicates allowed) Log History Maintain insertion order