Grab Your LLD Notes

Start Learning Now

Hi, I'm Manoj Kumar

Full Stack and Generative AI Developer building SaaS products, AI tools, and scalable web apps.

Connect with Me

• LinkedIn: linkedin.com/in/manojofficialmj
• X (Twitter): x.com/manojofficialmj

Support My Work

I'm working hard to provide free, high-quality Java, OOP, and Low-Level Design notes, code, and resources for everyone.

If this repository helped you in any way, you can support my work:

Buy Me a Coffee

Your support will help me:

• Create more structured content
• Improve explanations and examples
• Keep everything free for the community

Every coffee fuels more content.

Thank you for being part of this journey.

LLD SUPRA 1.0 PDF NOTES IN JAVA

In this repository, you will get each and every class's notes except basics of java in the form of PDF with good explanation.

Basics of Java

This section covers fundamental concepts and features of Java programming language.

#	Topic	Read Articles
1.	Introduction of Java	Link
2.	Java Vs C++	Link
3.	Java program execution process	Link
4.	JDK Vs JRE Vs JVM	Link
5.	Write your first Java program	Link
6.	Variables in Java	Link
7.	Data types in Java	Link
8.	Type conversion in Java	Link
9.	Operators in Java	Link
10.	Taking input in Java	Link
11.	Java garbage collection	Link
12.	Conditional statements	Link
13.	Loop statements	Link
14.	Arrays in Java	Link 1 Link 2
15.	Methods in Java	Link 1 Link 2
16.	Strings in Java	Link
17.	Exception handling in Java	Link
18.	Wrapper classes in Java	Link

Object Oriented Programming in Java

This section covers Object Oriented Programming concepts in Java.

#	Topic	Subtopics	Read Articles
1.	Introduction to OOPS	Show Subtopics - 📝 Why Object Oriented Programming - 📝 Multiple Students Example - Messy Code - 📝 What is OOP? - 📝 Objects and Classes - 📝 Attributes and Behaviour and Identity	Link
2.	How to create a class and object in Java	Show Subtopics - 📝 Must define some blue print - class - 📝 Object an instance of class - 📝 What is constructor? - 📝 Default constructor - 📝 Parameterized constructor - 📝 Copy constructor - 📝 Object life cycle	Link
3.	Encapsulation in Java	Show Subtopics - 📝 What is encapsulation? - 📝 Access modifiers (Brief) in Java - 📝 Not perfect encapsulation - 📝 Perfect encapsulation	Link
4.	Inheritance in Java	Show Subtopics - 📝 What is inheritance? - 📝 When do we use inheritance? - 📝 General IS-A example - 📝 Advantages of inheritance - 📝 Implementation of inheritance - 📝 Access modifiers (In Detailed) in Java - 📝 Type of inheritance - 📝 super keyword in Java - 📝 super VS this keyword in Java - 📝 Structure design program using inheritance	Link
5.	Polymorphism in Java	Show Subtopics - 📝 What is polymorphism? - 📝 Types of polymorphism - 📝 Static polymorphism - 📝 Dynamic polymorphism - 📝 Downcasting in Java - 📝 Important notes - 📝 Method overloading Vs method overriding	Link
6.	Abstraction in Java	Show Subtopics - 📝 What is abstraction? - 📝 Abstraction in java collections - 📝 Ways to achieve abstraction - 📝 Abstraction using classes - 📝 Abstraction using abstract class - 📝 Abstraction using interface (new way to design strategy) - 📝 Upcasting in abstraction - 📝 Real world examples of abstraction - 📝 Abstract class Vs interface - 📝 Advantages of abstraction - 📝 Achieve multiple inheritance using interface	Link
7.	List Interface - Collections Framework in Java	Show Subtopics - 📝 ArrayList Class in List Interface - 📝 LinkedList Class in List Interface - 📝 Vector Class in List Interface - 📝 Stack Class in List Interface	Link
8.	Queue Interface - Collections Framework in Java	Show Subtopics - 📝 PriorityQueue Class in Queue Interface - 📝 ArrayDeque Class in Queue Interface - 📝 LinkedList Class in Queue Interface	Link
9.	Set Interface - Collections Framework in Java	Show Subtopics - 📝 HashSet Class in Set Interface - 📝 LinkedHashSet Class in Set Interface - 📝 EnumSet Class in Set Interface - 📝 TreeSet Class in Set Interface	Link
10.	Map Interface - Collections Framework in Java	Show Subtopics - 📝 HashMap Class in Map Interface	Link
11.	Comparable Interface - Collections Framework in Java	Show Subtopics - 📝 Implementing Comparable Interface	Link
12.	Comparator Interface - Collections Framework in Java	Show Subtopics - 📝 Implementing Comparator Interface	Link

Object-Oriented Analysis And Design Module I & II

This section covers topics related to Object-Oriented Analysis and Design in Java.

Topic	PDF NOTES	Read Articles
1. What is OOAD & Why OOAD?	Link	Link
2. Introduction To UML	Link	Link
3. UML Basic Notations	Link	Link
4. Types of UML Diagram	Link	Link
5. UML Use Case Diagram	Link	Link
6. UML Class Diagram	Link	Link
7. UML Sequence Diagram	Link	Link
8. UML Activity Diagram	Link	Link

I will provide Articles very soon

Object Oriented Design Principles - SOLID (Module-I & II)

Topic	PDF NOTES	Read Articles
1. What is SOLID Principles?	Link	Link
2. Single Responsibility Principle (SRP)	Link	Link
3. Open-Closed Principle (OCP)	Link	Link
4. Liskov Substitution Principle (LSP)	Link	Link
5. Interface Segregation Principle (ISP)	Link	Link
6. Dependency Inversion Principle (DIP)	Link	Link

Creational Design Parterns - Software Design Patterns

Topic	ARTICLE NOTES	PDF Articles
What are Creational Design Patterns	Link
1. Factory Design Pattern	Link
2. Abstract Factory Design Pattern	Link
3. Builder Design Pattern	Link
4. Singleton Design Pattern	Link
5. Prototype Design Pattern	Link

Structural Design Parterns - Software Design Patterns

Topic	ARTICLE NOTES	PDF Articles
What are Structural Design Patterns	Link
1. Decorator Design Pattern	Link
2. Adapter Factory Design Pattern	Link
3. Proxy Design Pattern	Link
4. Facade Design Pattern	Link
5. Bridge Design Pattern	Link
6. Composite Design Pattern	Link
7. Flyweight Design Pattern	Link

Behavioural Design Parterns - Software Design Patterns

Topic	ARTICLE NOTES	PDF Articles
What are Behavioural Design Patterns	Link
1. Chain of Responsibility Design Pattern	Link
2. Command Factory Design Pattern	Link
3. Mediator Design Pattern	Link
4. Observer Design Pattern	Link
5. Iterator Design Pattern	Link
6. Visitor Design Pattern	Link

---

Ready to Level Up in LLD?

If these notes helped you, please support the project:

• Star this repository
• Share it with your friends
• Support my work: https://buymeacoffee.com/manojofficialmj

Your support helps me keep creating free, high-quality content for the community.