Java – Core to Advanced Topics

Welcome to the complete Java study guide. This page is designed to help beginners and intermediate learners master both Core Java and Advanced Java concepts step-by-step.

🔹 Core Java Topics

1. Getting Started

  • What is Java?
  • Setting up Java (JDK, JRE)
  • Writing your first Java program
  • Java Program Structure
  • Java IDEs (IntelliJ, Eclipse)

2. Fundamentals

  • Data Types and Variables
  • Operators and Expressions
  • Control Statements (if, switch, loops)
  • Type Casting
  • Comments and Code Structure

3. Object-Oriented Programming (OOP)

  • Classes and Objects
  • Constructors
  • Inheritance
  • Polymorphism
  • Abstraction & Interfaces
  • Encapsulation

4. Java Memory and Execution

  • Stack vs Heap Memory
  • Garbage Collection
  • Static vs Instance

5. Arrays and Strings

  • One & Multi-dimensional Arrays
  • Array Methods
  • String Class
  • StringBuilder & StringBuffer

6. Exception Handling

  • try-catch-finally
  • throw and throws
  • Custom Exceptions
  • Exception Hierarchy

7. Collections Framework

  • List, Set, Map
  • ArrayList, LinkedList, HashSet, TreeSet
  • HashMap, LinkedHashMap, TreeMap
  • Iterators and Streams

8. File Handling

  • FileReader, FileWriter
  • BufferedReader, BufferedWriter
  • Serialization & Deserialization

9. Multithreading

  • Thread Class & Runnable Interface
  • Thread Lifecycle
  • Synchronization
  • Inter-thread Communication

10. Java 8 Features

  • Lambda Expressions
  • Functional Interfaces
  • Streams API
  • Optional Class
  • Date & Time API (java.time)

🔹 Advanced Java Topics

1. Java JDBC

  • JDBC Architecture
  • Connecting to a Database
  • CRUD Operations
  • PreparedStatement vs Statement

2. Servlets and JSP

  • Servlet Lifecycle
  • Writing and Deploying Servlets
  • JSP Basics
  • JSP Tags and Directives

3. Java EE Basics

  • Overview of Java EE
  • Dependency Injection
  • JPA (Java Persistence API)
  • RESTful Web Services (JAX-RS)
  • SOAP Web Services (JAX-WS)

4. Spring Framework (Introduction)

  • Spring Core Concepts
  • Dependency Injection (DI)
  • Spring Boot Basics
  • REST API with Spring Boot
  • Spring Data JPA

5. Hibernate (ORM)

  • Hibernate Configuration
  • Mapping Classes to Tables
  • Annotations and Relationships
  • HQL (Hibernate Query Language)

6. Design Patterns

  • Singleton, Factory, Strategy
  • Observer, Builder, Adapter
  • MVC Architecture

7. Unit Testing in Java

  • JUnit Basics
  • Test Cases and Assertions
  • Mockito for Mocking

📌 Suggested Learning Path:

  1. Start with Core Java topics (1–10 above)
  2. Practice object-oriented programming with mini projects
  3. Move to Advanced Java: JDBC → Servlets → Spring Boot
  4. Build real-world projects and integrate databases
  5. Learn design patterns and testing for professional-grade coding

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