Order	Topic	Link to .md File
1	Basics (Syntax, Datatypes)	scoping.md (some parts)
2	OOPs Concepts - Inheritance	inheritance.md
3	OOPs Concepts - Abstraction	abstraction.md
4	OOPs Concepts - Polymorphism	polymorphism.md
5	Exception Handling	exceptionHandling.md
6	File Handling (IO)	fileHandling.md
7	Collections Framework	collections.md
8	Comparable & Comparator	comparableExamples.md
9	Generics	generics.md
10	Regular Expressions	regularExpression.md
11	Annotation Basics	annotation.md
12	Java Reflection API	reflection.md
13	Java 8 Features	java8.md
14	• Lambda Expressions	lambdaExpression.md
15	• Functional Interfaces	functional_Interface.md
16	• Method References	methodReference.md
17	• Streams	streamAPI.md
18	• Optional Class	optionalClasses.md
19	• Date and Time API	dateTimeApi.md
20	Data Structures (Custom)	dataStructures.md
21	Design Patterns	designPatterns.md
22	JUnit (Unit Testing)	junit.md