☕ Java Core – Complete Practice Repository 📌 Overview

Welcome to Java Core – a comprehensive repository containing my structured practice and learning journey in Core Java.

This repository covers fundamental to intermediate Java concepts including object-oriented programming, control flow, collections, exception handling, file handling, and problem-solving exercises.

As a Computer Science student, I created this repository to:

Strengthen Java fundamentals

Prepare for Data Structures & Algorithms

Build a strong base for backend development

Prepare for internships and technical interviews

Maintain organized coding practice

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🎯 Objectives

Master Core Java concepts

Write clean and readable code

Practice problem-solving regularly

Understand Object-Oriented Programming deeply

Build strong foundations for advanced topics (Spring Boot, Backend, etc.)

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🧠 Topics Covered 🔹 1. Basics of Java

Introduction to Java

JVM, JRE, JDK

Data Types

Variables

Operators

Type Casting

Input & Output (Scanner class)

🔹 2. Control Statements

if / else

switch

for loop

while loop

do-while loop

break & continue

🔹 3. Methods

Method declaration

Return types

Method overloading

Recursion

🔹 4. Object-Oriented Programming (OOP)

Classes & Objects

Constructors

this keyword

Encapsulation

Inheritance

Polymorphism

Method Overriding

Abstraction

Interfaces

🔹 5. Arrays

Single-dimensional arrays

Multi-dimensional arrays

Array operations

Sorting & searching basics

🔹 6. Strings

String methods

StringBuilder

String comparison

Pattern programs

🔹 7. Exception Handling

try-catch

finally

throw & throws

Custom exceptions

🔹 8. Collections Framework

ArrayList

LinkedList

HashSet

HashMap

Iterators

🔹 9. File Handling

Reading files

Writing files

File class

BufferedReader & BufferedWriter

🔹 10. Practice Programs

Number-based problems

Pattern printing

Basic algorithmic problems

Mini console-based programs

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🗂️ Folder Structure

java-core/ │ ├── basics/ ├── control-statements/ ├── methods/ ├── oop/ ├── arrays/ ├── strings/ ├── exception-handling/ ├── collections/ ├── file-handling/ └── practice-programs/

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🛠️ Technologies Used

Java (JDK 17)

VS Code / IntelliJ IDEA

Git & GitHub

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▶️ How to Run the Programs

Install JDK (Java Development Kit)

Clone this repository:

git clone https://github.com/Ronit049/core-java

Navigate to the desired folder

Compile the file:

javac FileName.java

Run the program:

java FileName

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📈 Learning Approach

Daily practice

Writing code without copying

Focusing on logic building

Understanding concepts before implementation

Improving code readability and structure

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🚀 Future Improvements

Add Data Structures implementation in Java

Add small Java console projects

Add notes and explanations

Add problem-solving section (LeetCode style)

Add unit testing examples

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👨‍💻 About Me

I am a Computer Science Engineering student passionate about programming, backend development, and problem-solving.

Currently focusing on:

Java Development

Data Structures & Algorithms

Internship Preparation

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⭐ Why This Repository?

This repository reflects:

Consistency

Structured learning

Practical coding implementation

Strong foundation building

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📬 Connect With Me

🏆 CodeChef

💡 HackerRank

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⭐ This repository grows as I grow.