Engineering Atlasby Abhishek Goyal
Course contents

Module 01

Java Fundamentals

Start here. How Java runs, its type system, control flow, methods and arrays: the base every later module builds on.

Free module6 topics26 lessons & question sets26 ready

By the end of this module you can

  • Explain exactly how a .java file becomes a running program
  • Use primitives, wrappers and casting without surprises
  • Reason about pass-by-value and method calls

How Java runs

JDK, JRE and JVM, and the journey from source code to a running program.

  1. JDK, JRE and JVM explainedLesson · 11 minFree
  2. From source to bytecode to running programLesson · 11 minFree
  3. Your first Java program and the main() methodLesson · 10 minFree
  4. How Java runs: interview questions & scenariosInterview Q&AFree

Data types & variables

Primitives, wrappers, casting and the defaults that trip people up.

  1. Primitive types and their sizesLesson · 12 minFree
  2. Wrapper classes and autoboxingLesson · 11 minFree
  3. Type casting and numeric promotionLesson · 11 minFree
  4. Default values, literals and constantsLesson · 10 minFree
  5. var and local type inferenceLesson · 10 minFree
  6. Data types & variables: interview questions & scenariosInterview Q&AFree

Operators & control flow

Operators, precedence, branching and loops.

  1. Operators and precedenceLesson · 10 minFree
  2. if, switch and the switch expressionLesson · 10 minFree
  3. Loops, for-each, break, continue and labelsLesson · 9 minFree
  4. Operators & control flow: interview questions & scenariosInterview Q&AFree

Methods & arrays

How method calls really pass arguments, overloading, varargs and arrays.

  1. Methods and why Java is always pass-by-valueLesson · 11 minFree
  2. Overloading and varargsLesson · 11 minFree
  3. Arrays and multi-dimensional arraysLesson · 10 minFree
  4. Methods & arrays: interview questions & scenariosInterview Q&AFree

Strings basics

The String API you use every day and comparing strings correctly.

  1. Essential String methodsLesson · 12 minFree
  2. == vs equals() for stringsLesson · 10 minFree
  3. Reading input and formatting outputLesson · 11 minFree
  4. Strings basics: interview questions & scenariosInterview Q&AFree

Packages & access

Organising code with packages and controlling visibility.

  1. Packages and importsLesson · 13 minFree
  2. Access modifiersLesson · 13 minFree
  3. Packages & access: interview questions & scenariosInterview Q&AFree

Finish the module

Module interview question bank

Every interview question worth practising for Java Fundamentals, grouped by topic, with model answers, how to say them and what-if follow-ups.

44 questions · 23 what-if follow-ups6 topic question sets

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