Java Knowledge Hub

Understand Java. Do not just memorise it.

Explore Java as a connected ecosystem, from fundamentals to modern backend engineering.

Syntax - OOP - Arrays

Strings - Exceptions - Collections

Threads - Java 8+ - JVM

Spring - Boot - JPA

APIs - Architecture - Projects

Topics

Build a stronger Java foundation.

Each topic is designed for practical explanation and interview-ready clarity.

Beginner

Syntax, variables, arrays, methods, control flow and foundations.

Basics, OOP, Arrays
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Beginner

Lists, Sets, Maps, iterators and internal working.

List, Set, Map
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Beginner

Threads, synchronization, executors and concurrency.

Threads, Concurrency, Executors
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Beginner

Lambda, functional interfaces, streams and Optional.

Lambda, Streams, Optional
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Beginner

JDK, JRE, JVM, class loading, heap and stack.

JVM, Memory, GC
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Beginner

IoC, DI, REST APIs, JPA and Hibernate.

Spring, REST, JPA
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