Java Full Stack Developer : Interview Oriented Master Course

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Core Java Fundamentals

Level: Beginner → Intermediate. Learn Java philosophy, JDK vs JRE vs JVM, Java Memory Model, variables, string handling, wrapper classes, final keyword, pass-by-value concept, and garbage collection basics.

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Learning objectives Understand Java Philosophy – Write Once, Run Anywhere Learn JDK vs JRE vs JVM Master Java Memory Model (Heap & Stack) Understand Variables (Local, Instance, Static) Learn == vs equals() Master String, StringBuilder, StringBuffer Understand Wrapper Classes & Autoboxing Learn final keyword Understand Pass-by-Value Concept Learn Garbage Collection Basics

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Object-Oriented Programming (OOP)

Level: Beginner → Advanced. Master the four pillars of OOP, encapsulation, inheritance vs composition, polymorphism, abstraction, method overloading vs overriding, static vs instance members, and SOLID design principles.

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Learning objectives Master Four Pillars of OOP Understand Encapsulation with real examples Learn Inheritance vs Composition (Real-world design) Master Polymorphism (Why it matters in production) Understand Abstraction – Abstract Class vs Interface Learn Method Overloading vs Overriding Understand Static vs Instance members Introduction to SOLID design thinking

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Collections Framework

Level: Intermediate → Advanced. Deep dive into Collection hierarchy, List vs Set vs Map, ArrayList vs LinkedList performance, HashMap internal working, ConcurrentHashMap, and null handling in collections.

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Learning objectives Understand Collection Hierarchy Learn List vs Set vs Map Master ArrayList vs LinkedList (Performance truth) Understand HashMap internal working Learn HashMap vs LinkedHashMap vs TreeMap Master Comparable vs Comparator Understand Iterator vs ListIterator vs Enumeration Learn ConcurrentHashMap vs HashMap vs Hashtable Understand Null handling in collections

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Exception Handling

Level: Intermediate. Learn checked vs unchecked exceptions, try-catch-finally, try-with-resources, exception propagation, custom exceptions, and exception handling best practices.

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Learning objectives Understand Checked vs Unchecked Exceptions Master try-catch-finally Learn try-with-resources Understand Exception Propagation Create Custom Exceptions Learn Exception Handling Best Practices Master Logging & rethrowing strategy

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Multithreading & Concurrency

Level: Advanced. Master thread creation, synchronized keyword limitations, volatile keyword, Java Memory Model & Happens-Before, Thread Pools, ExecutorService, CountDownLatch, CyclicBarrier, Semaphore, and deadlock prevention. High interview value for product companies.

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Learning objectives Learn Thread creation methods Understand synchronized keyword limitations Master volatile keyword Learn Java Memory Model & Happens-Before Understand Thread Pools & ExecutorService Learn ThreadPoolExecutor internals Master CountDownLatch Understand CyclicBarrier Learn Semaphore Master Deadlock & Prevention techniques

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Java 8+ Features

Level: Intermediate → Advanced. Master Lambda expressions, functional interfaces, Stream API, Map/Filter/Reduce, Optional class, parallel streams, records, pattern matching, and modern Java coding style.

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Learning objectives Master Lambda Expressions Understand Functional Interfaces Learn Stream API Master Map, Filter, Reduce Understand Optional Class Learn Parallel Streams Master Records Understand Pattern Matching Learn Modern Java coding style

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Spring Framework Core

Level: Intermediate. Understand why Spring exists, IoC & Dependency Injection, ApplicationContext, Bean Lifecycle, Bean Scopes, component annotations, constructor injection, and Spring AOP basics.

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Learning objectives Understand Why Spring exists (Problems it solves) Master IoC & Dependency Injection Learn ApplicationContext Understand Bean Lifecycle Learn Bean Scopes Master @Component vs @Service vs @Repository Understand Constructor Injection (Best practice) Learn Spring AOP basics Understand Cross-cutting concerns

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Spring Boot

Level: Intermediate. Learn why Spring Boot, auto-configuration, starter dependencies, application properties, profiles (dev/prod), actuator basics, and exception handling in Spring Boot.

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Learning objectives Understand Why Spring Boot Master Auto-configuration Learn Starter dependencies Configure Application properties Understand Profiles (dev/prod) Learn Actuator basics Master Exception handling in Spring Boot

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Spring Security

Level: Intermediate. Master authentication vs authorization, Spring Security flow, filters & security context, password encoding, and role-based access control.

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Learning objectives Understand Authentication vs Authorization Learn Spring Security flow Master Filters & Security Context Learn Password encoding Understand Role-based access control

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RESTful Web Services

Level: Intermediate. Learn REST principles, HTTP methods, REST annotations, request & response handling, exception handling in REST, and best practices.

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Learning objectives Understand REST principles Master HTTP methods Learn REST annotations Understand Request & Response handling Master Exception handling in REST Learn Best practices

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Database & JPA / Hibernate

Level: Intermediate → Advanced. Master ORM concepts, JPA vs Hibernate, entity lifecycle, fetch types, lazy vs eager loading, JPQL, N+1 problem, and transactions.

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Learning objectives Understand ORM concepts Learn JPA vs Hibernate Master Entity lifecycle Understand Fetch types Learn Lazy vs Eager loading Master JPQL Understand N+1 problem Learn Transactions

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Testing

Level: Intermediate. Learn unit testing basics, JUnit, Mockito, mocking dependencies, and testing Spring components.

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Learning objectives Understand Unit Testing basics Master JUnit Learn Mockito Understand Mocking dependencies Learn Testing Spring components

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Build Tools

Level: Beginner. Learn Maven lifecycle, pom.xml, dependencies & plugins, and Gradle basics.

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Learning objectives Understand Maven lifecycle Learn pom.xml Master Dependencies & plugins Learn Gradle basics

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Design Patterns

Level: Intermediate → Advanced. Understand why design patterns matter, and learn Singleton, Factory, Builder, Strategy, Observer, Adapter patterns with real-world usage.

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Learning objectives Understand Why Design Patterns Master Singleton Learn Factory Understand Builder Master Strategy Learn Observer Understand Adapter Learn Real-world usage

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System Design & Architecture

Level: Advanced. Master layered architecture, hexagonal architecture, event-driven architecture, CQRS, API Gateway, circuit breaker, saga pattern, caching strategies, and message queues.

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Learning objectives Understand Layered Architecture Learn Hexagonal Architecture Master Event-Driven Architecture Understand CQRS Learn API Gateway Master Circuit Breaker Understand Saga Pattern Learn Caching Strategies Master Message Queues

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Docker & Containerization

Level: Beginner. Learn what Docker is, containers vs VMs, Dockerfile basics, and Java app containerization.

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Learning objectives Understand What is Docker Learn Containers vs VMs Master Dockerfile basics Learn Java app containerization

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Practical Coding Problems

Level: Interview-Focused. Solve practical coding problems including second largest number, palindrome check, duplicate elements, thread-safe counter, reverse linked list, Two Sum, LRU Cache, Producer–Consumer, and Rate Limiter.

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Learning objectives Solve Second largest number Master Palindrome check Handle Duplicate elements Implement Thread-safe counter Learn Reverse linked list Solve Two Sum problem Implement LRU Cache Master Producer–Consumer pattern Implement Rate Limiter

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Advanced Interview Concepts

Level: Advanced. Master sync vs async decision making, production debugging, good code vs production-ready code, performance optimization, and security best practices.

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Learning objectives Understand Sync vs Async decision making Master Production debugging Learn Good code vs Production-ready code Understand Performance optimization Master Security best practices