Java Fundamentals

Master Java from basics to advanced concepts — 204 topics across 22 chapters covering OOP, collections, multithreading, streams, and interview preparation.

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Introduction to Java

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1What is Java?2History of Java 3JDK, JRE, and JVM 4Features of Java 5Your First Java Program 6Compilation and Execution Process

Basic Syntax

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1Keywords and Identifiers 2Data Types 3Variables 4Operators 5Type Casting and Conversion 6Input and Output 7Comments 8Literals 9Wrapper Classes

Control Flow

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1if-else Statements 2switch-case 3for Loop 4while Loop 5do-while Loop 6Enhanced for Loop 7break and continue 8Labeled Statements 9Ternary Operator

Arrays

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1One-Dimensional Arrays 2Multi-Dimensional Arrays 3Jagged Arrays 4Array Operations 5Arrays Class 6Variable Arguments (Varargs)

Strings

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1String Basics 2String Methods 3String Comparison 4String Immutability 5String Pool 6StringBuilder 7StringBuffer 8StringTokenizer 9Regular Expressions

Methods

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1Method Declaration 2Method Parameters 3Return Types 4Method Overloading 5Recursion 6Static Methods 7final Methods 8Method References

Object-Oriented Programming

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1Classes and Objects 2Constructors 3this Keyword 4Access Modifiers 5static Keyword 6final Keyword 7Instance vs Static 8Nested Classes 9Anonymous Classes 10Object Class 11equals() and hashCode()12toString() Method 13Immutable Classes

Inheritance

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1Inheritance Basics 2super Keyword 3Method Overriding 4Types of Inheritance 5Multiple Inheritance 6Constructor Chaining 7Covariant Return Type 8instanceof Operator

Abstraction

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1Abstraction Basics 2Abstract Classes 3Abstract Methods 4Interfaces 5Default Methods 6Static Methods in Interfaces 7Functional Interfaces 8Marker Interfaces 9Interface vs Abstract Class

Encapsulation

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1Encapsulation Basics 2Getters and Setters 3POJO and Java Beans 4Benefits of Encapsulation

Packages & Modules

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1Packages 2import Statement 3Static Import 4CLASSPATH 5JAR Files 6Modules (Java 9+)

Exception Handling

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1Exceptions Basics 2try-catch Block 3finally Block 4throw Keyword 5throws Keyword 6Checked vs Unchecked Exceptions 7Custom Exceptions 8Exception Hierarchy 9try-with-resources 10Multi-catch Block 11Exception Handling Best Practices

Generics

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1Generics Basics 2Generic Classes 3Generic Methods 4Bounded Type Parameters 5Wildcards 6Type Erasure 7Generic Interfaces 8Generics Best Practices

Java Memory Model

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1Heap vs Stack 2Garbage Collection 3GC Algorithms 4Memory Leaks 5Reference Types 6JVM Memory Structure 7Memory Tuning

Annotations

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1Annotations Basics 2Built-in Annotations 3Custom Annotations 4Meta Annotations 5Annotation Processing 6Common Framework Annotations

Reflection

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1Reflection Basics 2Class Object 3Inspecting Fields 4Inspecting Methods 5Inspecting Constructors 6Creating Instances 7Reflection Use Cases

Date & Time API

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1Legacy Date and Time 2New Date/Time API 3LocalDate 4LocalTime 5LocalDateTime 6ZonedDateTime 7Instant 8Period and Duration 9Date/Time Formatting

Modern Java Features

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1var Keyword 2Text Blocks 3Switch Expressions 4Record Classes 5Sealed Classes 6Pattern Matching 7Virtual Threads 8Structured Concurrency 9Stream Gatherers 10Foreign Function & Memory API 11Unnamed Patterns and Variables

Testing in Java

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1JUnit 5 Fundamentals 2Mocking with Mockito 3Integration Testing with Testcontainers 4Testing Best Practices 5Code Coverage with JaCoCo

Common Java Pitfalls

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1String Comparison Mistakes 2Concurrency Mistakes 3Collection Mistakes 4Resource Leaks

Java Fundamentals

All Modules

Introduction to Java

Basic Syntax

Control Flow

Arrays

Strings

Methods

Object-Oriented Programming

Inheritance

Abstraction

Encapsulation

Packages & Modules

Exception Handling

Collections Framework

Generics

Multithreading

Java Memory Model

Annotations

Reflection

Date & Time API

Modern Java Features

Testing in Java

Common Java Pitfalls