BCA-201N · Object Oriented Programming using JAVA
Unit 2
Classes, Objects, Methods, Constructors & Inheritance
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Unit 2 Learning Hub
Classes, Objects, Methods, Constructors & Inheritance
Official MJPRU BCA Unit 2: Classes, Objects, Methods, Constructors & Inheritance for BCA-201N (Object Oriented Programming using JAVA).
Syllabus Topics:Object-Oriented Programming Principles: Encapsulation, Data Abstraction, Inheritance, PolymorphismClass Definition in Java: Member Variables, Member Methods, Access Specifiers within ClassObject Creation & Memory Layout: new Operator, Heap Allocation, Reference Variables in StackMethods in Java: Declaration, Syntax, Return Types, Parameter Passing Semantics (Strict Pass-by-Value)Nesting of Methods & Method Overloading: Compile-Time Polymorphism via Argument Lists and Data TypesConstructors in Java: Purpose, Default Constructor, Parameterized Constructors, Constructor OverloadingThe this Reference: Resolving Instance Variable Shadowing, Invoking Overloaded Constructors (this())Static Members: static Fields (Class-Level Storage), static Methods, Static Initialization BlocksInheritance Fundamentals: Subclass and Superclass Concepts, extends Keyword, IS-A RelationshipForms of Inheritance: Single, Multilevel, Hierarchical (Why Multiple Inheritance of Classes is Disallowed)The super Keyword: Invoking Superclass Constructors (super()), Calling Overridden Superclass MethodsMethod Overriding: Runtime Polymorphism, Dynamic Method Dispatch, Rules and Method Signature ConstraintsThe final Keyword: final Variables (Constants), final Methods (Preventing Override), final ClassesAbstract Classes & Abstract Methods: Concept, abstract Keyword, Rules, Enforcing Contractual ImplementationsGarbage Collection & Object Lifecycle: Heap Management, Object Dereferencing, System.gc(), finalize() Method
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Introduction to Computers & The IPO Cycle
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Topic 1 · The foundation of modern computing
Introduction to Computers & The IPO Cycle
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Ready to master this concept? Give it a quick read & tap the check!
💡 The Big Picture:A computer is an electronic system that takes raw data as Input, processes it under programmed logic, and produces meaningful Information as Output.
🍪 Everyday Analogy:Think of baking cookies: Flour & Sugar (Input) ➔ The Oven (Processing) ➔ Warm Delicious Cookie (Output)! 🍪
Key Exam Takeaways
- ·Data = Raw, unprocessed facts without context (e.g. 42, 'apple').
- ·Information = Structured data with meaning (e.g. 'Temperature: 42°C').
- ·Hardware is what you can touch; Software is the instructions running inside.
Instant Knowledge Check
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Which of the following represents unprocessed raw facts?
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