Collection Vs Collections in Java

Shallow Cloning & Deep Cloning

Time & Space Complexity

Encapsulation in Java

Abstract Class vs Interface in Java

ArrayList vs LinkedList in Java

Global v/s Local Variables - Java

Loops vs Streams in Java

Comparable vs Comparator in Java

Atomic Variables

Intrinsic Locks - Synchronization

Null Pointer Exception – Blasphemy!

Serial Version UID

Immutable Classes

Basic Optimization Steps for a simple code

Static Class Vs SingleTon Pattern

Stack

Thread Locals

Thread States

ConcurrentHashMap in Java