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Java OOPs and Basic Programs 🚀

This repository contains Java programs that demonstrate core Object-Oriented Programming (OOP) concepts along with a collection of basic utility programs for beginners. It is designed to provide hands-on examples for learning and revising Java fundamentals.

📂 Folder Structure

java-Oops/
└── java_new/
    └── src/
        └── com/
            └── java/
                ├── abstraction.java
                ├── encapsulation.java
                ├── inheritance.java
                ├── polymorphism.java
                ├── user_input.java
                └── programes.java

📘 Topics Covered

🔹 OOP Concepts

  • ✅ Abstraction: Using abstract classes and/or interfaces
  • ✅ Encapsulation: Using private fields and public getters/setters
  • ✅ Inheritance: Demonstrating base and derived classes

Each file in this section demonstrates one of the four main Object-Oriented Programming principles using Java.

🧱 Abstraction (abstraction.java)

Demonstrates:

  • Abstract classes and methods
  • Real-world examples with:
    • animal class and subclasses lion and tiger
    • shape class and subclasses circle, Triangle
    • Bank class and subclasses SavingsAccount, CurrentAccount

Key Concepts:

  • Abstract methods must be implemented by subclasses.
  • You cannot instantiate abstract classes.

🔐 Encapsulation (encapsulation.java)

Demonstrates:

  • Using private variables and public getters/setters for data hiding
  • Examples:
    • person, BankAccount, Rectangle, Employee, Car, Student, and Circle_ classes

Key Concepts:

  • Encapsulation protects internal data by exposing controlled access via getter and setter methods.
  • Promotes modularity and maintainability.

🧬 Inheritance (inheritance.java)

Demonstrates:

  • Single-level inheritance with classes father → childern
  • Method overriding with Animal and Cat classes

Key Concepts:

  • Subclasses inherit fields and methods from their parent classes.
  • Overriding allows a subclass to provide a specific implementation of a method.

🔁 Polymorphism (polymorphism.java)

Demonstrates:

  • Compile-time Polymorphism (Method Overloading) — not present directly but can be extended
  • Run-time Polymorphism (Method Overriding) using:
    • Animalfamily → bird, cat_
    • shapes → circle_shape, rectangle

Key Concepts:

  • Polymorphism allows the same method to behave differently depending on the object calling it.
  • Enhances flexibility and reusability of code.

🔹 Utility & Practice Programs (in Programes.java)

  • Coin toss simulation
  • Leap year check
  • Finding factors of a number
  • Quotient and remainder
  • Swapping numbers
  • Even or odd check
  • Vowel or consonant check
  • Finding the largest among three numbers
  • Printing squares (power of 2)
  • Harmonic number series

🔹 Input Handling (in user_input.java)

The user_input.java file demonstrates usage of the Scanner class to take various types of user input and perform basic operations like:

  • Name confirmation loop
  • Sum and product of integers
  • Rectangle area calculation
  • Printing user profile (name, roll number, interest)
  • Square of a number
  • Concatenating strings
  • Perimeter of a square
  • Equality check among three numbers
  • Condition checking using if-else
  • Marks input with validation (max 100 per subject)
  • Percentage calculation

▶️ How to Run the Programs

  1. Clone the repo:

    git clone https://github.com/your-username/java-Oops.git

  2. Navigate to the source folder:

    cd java-Oops/java_new/src

  3. Compile and run a Java file:

    javac com/java/Programs.java
java com.java.Programs

Make sure your terminal is in the src directory so the package paths resolve correctly.

🧠 Ideal For

  • Java beginners learning OOP
  • Students practicing for exams or interviews
  • Quick revision of Java fundamentals through examples