OOPS in JAVA - Ultimate

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✅ Looking for the best notes on OOP concepts in JS? Here’s one for you:

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I originally put these notes together back in college, so if you’re working through OOP concepts in Java, they might save you some time. Thought I'd share in case it helps anyone out feel free to check them out!

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👉🏽 Extra Notes

⭐ Revision and Quick Short Notes for Interview 🤔 Why Java Platform Independent

👉🏽 Start here

1. 📝 Introduction to Object-Oriented Programming

2. 🧰 Basic Terminologies

3. 🛠️ Creating Our Own Java Class

4. 📖 Chapter 1 - Question-Answer Practice Set

5. 🔐 Access Modifiers, Getters & Setters

6. 🔨 Constructors in Java

7. 📘 Chapter 2 - Question-Answer Practice Set

8. 🧬 Inheritance Overview in Java

9. 🌐 Types of Inheritance

10. 🔄 Constructors in Inheritance

11. 🚀 Method & Method Overloading, Void Keyword

• 🔸 Syntax of a method

• 🔸 Method returns the sum of two numbers

• 🔸 Calling a Method

• 🔸 Process of method invocation

• 🔸 Overloaded function foo

• 🔸 Method overloading Type 1 - By changing the return type

• 🔸 Method overloading Type 1 - By changing the number of arguments passed

• 🔸 Can we overload java main() method

• 🔸 Method Overloading and Type Promotion

12. 📏 Static Keyword

• 🔸 Java Static Variable

• 🔸 With Static Variable

• 🔸 Restriction on Static method

• 🔸 Static Method

• 🔸 Static block

• 🔸 Static Class

13. 🔢 Variable Arguments (VarArgs)

14. 🔁 this & super Keyword

• 🔸 Without This Keyword

• 🔸 With This Keyword

• 🔸 Without Super Keyword

• 🔸 With Super Keyword

15. 🧩 Method Overriding

• 🔸 Without Method Overridin

• 🔸 With Method Overriding

16. 🔄 Overloading and Overriding

17. 📊 Dynamic Method Dispatch

18. 📗 Chapter 3 - Question-Answer Practice Set

19. 🧾 Quick One Question-Answer on Chapter 1, 2 & 3

20. 🔍 Abstract Class & Abstract Methods

21. 🖇️ Introduction to Interfaces

22. ⚖️ Abstract Classes Vs Interfaces

23. 🚫 Why Multiple Inheritance is Not Supported in Java

• 🔸 Try to implement Multiple Inheritance

• 🔸 Multiple Inheritance Using Interface

24. ⚙️ Java Interfaces Example & Default Methods

25. 🏗️ Inheritance in Interfaces

26. 🔀 Polymorphism Concept in Interfaces

27. 📙 Chapter 4 - Question-Answer Practice Set

28. 📝 College Level Q&A on Chapters 1, 2, 3 & 4

29. 🛠️ Projects on Chapters 3 & 4 (Basic & Advance)

30. 💻 Interpreted vs Compiled Languages

31. 📂 Is Java Interpreted or Compiled?

32. ⚙️ Java File Compilation Process

33. 📦 Packages in Java

34. 🛠️ Creating a Custom Package

35. 🔓 Access Modifiers Experiment

• 🔸 AccessModifier

• 🔸 OutSidePackageExperiment

• 🔸 OutSidePackageSubclassExperiment

36. 📘 Chapter 5 - Question-Answer Practice Set

37. 🧾 Quick One Question-Answer on Chapter 5

38. 📘 Wrapper Classes in Java

• 🔸 Converting int to Integer (Primitive to Wrapper)

• 🔸 Converting Integer to int (Wrapper to Primitive)

• 🔸 Autoboxing (Detailed Explanation)

• 🔸 Unboxing (Detailed Explanation)

• 🔸 Demonstrate Wrapping and Unwrapping

39. 🔗 Constructor Chaining in Java

• 🔸 Using Super Keyword in Another Class

• 🔸 Using This Keyword in the Same Class

40. 🔐 Private Constructors and Singleton Classes

• 🔸 Using Private Constructors in Singleton Pattern

• 🔸 Example

41. 🔄 Types of Polymorphism

• 🔸 Compile-time Polymorphism

• 🔸 Run-time Polymorphism

42. 🛡️ Encapsulation Idea

• 🔸 Java Encapsulation

• 🔸 Data Hiding

43. 🔍 Nested Interface in Java

44. ⚙️ Modifiers Types