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HomeLearnJavaJava Core Fundamentals
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Java Core Fundamentals

The complete Java foundation — from OOP and the collections framework to generics, exceptions, and equals/hashCode. Every backend interview tests these topics; this course makes them second nature.

4 chapters 17 lessons
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Course content

1

Object-Oriented Programming

3 lessons
  • 1Classes and Objects
    Beginner8 min read
  • 2Inheritance and Polymorphism
    Beginner10 min read
  • 3Interfaces and Abstract Classes
    Intermediate10 min read
2

Collections Framework

6 lessons
  • 1List, Set, and Map
    Beginner12 min read
  • 2Generics
    Intermediate12 min read
  • 3Collections Framework Recap
    Beginner16 min read
  • 4HashMap Deep Dive
    Intermediate14 min read
  • 5TreeMap & LinkedHashMap
    Intermediate11 min read
  • 6Iterators & Modification Semantics
    Intermediate12 min read
3

Exceptions & Best Practices

3 lessons
  • 1Exception Handling
    Beginner10 min read
  • 2equals() and hashCode()
    Intermediate10 min read
  • 3String Manipulation
    Beginner7 min read
4

JVM Internals & Memory Management

5 lessons

Memory areas, garbage collection algorithms, modern collectors, memory leak patterns, and the tools to diagnose GC and memory problems in production.

  • 1JVM Memory Areas
    Advanced12 min read
  • 2Garbage Collection Fundamentals
    Intermediate9 min read
  • 3Modern Garbage Collectors
    Advanced9 min read
  • 4Memory Leaks in Java
    Advanced9 min read
  • 5GC Tuning & Diagnostics
    Advanced12 min read