Become Zero to Hero in Java with Koushal Jha

🚀 Java From Zero to Job-Ready — Complete Learning Path

This course is designed for absolute beginners to intermediate developers who want to master Java from scratch and build strong fundamentals for interviews, backend, and system design.

No confusion. No scattered resources. Just one clear roadmap 👇

📌 What You’ll Learn in This Course

🔹 Java Fundamentals (Beginner Level)

1. Introduction to Java & JDK/JRE/JVM
2. How Java works internally
3. Variables, Data Types & Type Casting
4. Operators & Expressions
5. Input / Output in Java
6. Control Statements (if-else, switch, loops)
7. Pattern problems (logic building)

🔹 Object-Oriented Programming (Core Java)

1. Class & Object
2. Encapsulation
3. Inheritance
4. Polymorphism (compile-time & runtime)
5. Abstraction
6. Interface vs Abstract Class
7. SOLID principles (intro)

🔹 Memory & Internals (Very Important 🔥)

1. Stack vs Heap memory
2. JVM architecture
3. ClassLoader mechanism
4. Garbage Collection
5. String constant pool
6. Shallow copy vs Deep copy

🔹 Strings & Wrapper Classes

1. String, StringBuilder, StringBuffer
2. Immutability in Java
3. Wrapper Classes & Autoboxing
4. equals() vs ==
5. hashCode() contract

🔹 Exception Handling

1. Checked vs Unchecked exceptions
2. try-catch-finally
3. throw vs throws
4. Custom exceptions
5. Best practices

🔹 Collections Framework (Deep Dive 💯)

1. List, Set, Map hierarchy
2. ArrayList vs LinkedList
3. HashSet vs TreeSet
4. HashMap vs LinkedHashMap vs TreeMap
5. Internal working of HashMap
6. Collisions & rehashing
7. Comparable vs Comparator
8. Real-world use cases

🔹 Multithreading & Concurrency

1. Thread life cycle
2. Creating threads (Thread vs Runnable)
3. Synchronization & Locks
4. volatile keyword
5. Deadlock, Starvation
6. Executor Framework
7. Concurrent Collections
8. HashMap vs ConcurrentHashMap

🔹 Java 8+ Features (Modern Java)

1. Lambda Expressions
2. Functional Interfaces
3. Stream API (map, filter, reduce)
4. Optional class
5. Method references
6. Date & Time API

🔹 File Handling & I/O

1. File class
2. BufferedReader & BufferedWriter
3. Serialization & Deserialization
4. NIO basics

🔹 Design & Best Practices

1. Coding standards
2. Clean code principles
3. Common Java anti-patterns
4. Performance tips

🔹 Interview Preparation (🔥 High Value)

1. Top Java interview questions
2. Internal workings explained clearly
3. Coding problems with solutions
4. Real interview scenarios
5. Tips to crack product-based companies

🎯 Who This Course Is For

1. Beginners starting Java from scratch
2. College students
3. Working professionals switching to backend
4. Developers preparing for Java interviews
5. Anyone who wants strong Java fundamentals

💡 Teaching Style

1. Simple language
2. Real-life examples
3. Diagram-based explanations
4. Interview-oriented approach
5. Doubt support & guidance