🚀 OOPS in Java (Core Concepts with Practical Programs)

This repository contains well-structured Java programs demonstrating important Object-Oriented Programming (OOP) concepts and Core Java fundamentals.

The programs are organized topic-wise to make learning and revision easier.

This repository serves as a practice space and reference for understanding Java concepts through hands-on examples.

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📚 Topics & Programs Covered

📁 Abstract Class

• AbstractExample.java
• StudentChallengeClassShape.java
• testing.java

Concepts:

• Abstract classes
• Abstract methods
• Real-life examples using abstract classes

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📁 Arrays

• BasicOfArray.java
• CopyAnArray.java
• Deletation.java
• ElementSum.java
• IncreasingSizeOfArray.java
• Insertion.java
• LeftRotate.java
• Max_Min.java
• Max_Min_3.java
• MissingNumber.java
• RightRotate.java
• SearchingElements.java
• TwoDarrayCreation.java
• TwoDarrayMultiplication.java
• TwoDarrayOperations.java

Concepts:

• Array creation
• Array insertion & deletion
• Searching elements
• Rotation operations
• 2D Arrays

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📁 Datatypes

• Datatypedetails.java
• WrapperClass.java

Concepts:

• Primitive data types
• Wrapper classes
• Type conversions

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📁 Exception Handling

• TryCatch.java
• TryCatchFinally.java

Concepts:

• try-catch blocks
• finally block
• Exception handling basics

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📁 Inheritance

• ConstInInheritance.java
• DynamicDispatch.java
• Inheritance.java
• InheritanceChallenge.java
• MethodOverridding.java
• ParameterizedConstructor.java
• ParameterizedConstructor2.java
• REvise.java
• StdentClass.java
• SuperKeyword.java
• ThisKeyword.java

Concepts:

• Inheritance
• Constructor chaining
• Dynamic method dispatch
• super & this keyword

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📁 Inner Classes

• AnonymousInnerClass.java
• LocalInnerClass.java
• NestedInnerClass.java
• StaticInnerClass.java

Concepts:

• Nested classes
• Local inner classes
• Anonymous classes

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📁 Interfaces

• CallbackMethod.java
• Interface.java
• InterfaceExample.java
• InterfacePractice.java

Concepts:

• Interface implementation
• Callback methods
• Multiple inheritance using interfaces

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📁 Java Basics

• BasicCalculator.java
• Inputs.java
• TypeCasting.java

Concepts:

• User input
• Basic calculations
• Type casting

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📁 Methods

• BasicOfMethod.java
• DiscountCalculator.java
• GCD.java
• MethodOverloading.java
• VarArgsProgram.java
• VariableArguments.java

Concepts:

• Method creation
• Method overloading
• Variable arguments (VarArgs)

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📁 OOPS

• ClassObjectExample.java
• ConstractorPractice.java
• Constructor.java
• DataHiding.java
• ProductCustomerChallenge.java
• RectangleExample.java
• SubjectStudentChallenge.java
• Swaped.java

Concepts:

• Classes & objects
• Constructors
• Encapsulation
• Data hiding

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📁 Recursion

• RecursionTree/
  • Four.java
  • One.java
  • Two.java
  • Three.java
• RecOne.java
• RecTwo.java
• Recurtion.java
• nthTermFab.java

Concepts:

• Recursive functions
• Recursion trees
• Fibonacci recursion

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📁 Static and Final

• FinalMember.java
• FinalMethod.java
• Singleton.java
• Static.java
• StaticBlock.java
• StudentChallenge.java

Concepts:

• static keyword
• static blocks
• final variables and methods
• Singleton pattern

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📁 Strings

• AnagramCheck.java
• Methods.java
• Palindrom.java
• RemoveDuplicate.java
• ReverseString.java
• StringAllClassesNotes2.java
• StringEquals.java
• StringImpBasicsNotes.java
• SubString.java
• Test.java
• VowelCount.java

Concepts:

• String operations
• String comparison
• Palindrome check
• Anagram check

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🎯 Purpose of This Repository

This repository helps to:

• Understand Object-Oriented Programming in Java
• Practice core Java concepts
• Improve problem-solving skills
• Prepare for Java interviews

It can be useful for:

• 👨‍🎓 Students learning Java
• 👨‍💻 Beginners practicing programming
• 💼 Interview preparation

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🛠 Technologies Used

• Java (Core Java)
• JDK 8+
• IDE: IntelliJ / Eclipse / VS Code

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▶️ How to Run the Programs

1️⃣ Clone the repository

git clone https://github.com/RamanVerma02/OOPS-JAVA.git

2️⃣ Navigate to project folder

cd OOPS-JAVA

3️⃣ Compile Java program

javac ProgramName.java

4️⃣ Run the program

java ProgramName

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📌 Repository Structure

OOPS-JAVA
│
├── Abstract class
├── Array
├── Datatypes
├── Exception Handling
├── Inheritance
├── InnerClass
├── Interfaces
├── Java Basics
├── Methods
├── OOPS
├── Recursion
├── Static_And_Final
├── Strings

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⭐ If you find this repository useful

Consider starring ⭐ the repository.

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👨‍💻 Author

Raman Verma

MCA Student with a strong interest in Software Development, Java, and Full Stack Development.

GitHub: https://github.com/RamanVerma02