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Coddy

Learn Java

via Coddy

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Overview

A free, interactive online Java course. You write Java on every lesson, with AI hints when something doesn't compile, and a free certificate when you finish.

  • Write strongly-typed Java with classes, methods, and generics
  • Apply OOP principles: encapsulation, inheritance, and polymorphism
  • Work fluently with the Java Collections framework
  • Handle exceptions and control flow the Java way

Syllabus

Fundamentals

  • Introduction
  • Variables Part 1
  • Variables Part 2
  • Operators Part 1
  • Operators Part 2
  • Decision Making
  • Basic IO
  • Calculator App
  • Loops
  • Methods (Functions)
  • Arrays Basics
  • Iterating Over Arrays
  • String Operations
  • Final Challenges

Logic & Flow

  • Multi-dimensional Arrays
  • HashMap Part 1
  • HashMap Part 2
  • HashSet Part 1
  • HashSet Part 2
  • Advanced Control Flow
  • Basic Error Handling
  • Advanced String Operations
  • Project - Unique Word Counter
  • Date and Time

Object Oriented Programming

  • Fundamentals of OOP
  • Access Modifiers & Encapsulate
  • Class Props & Static Member
  • Inheritance
  • Polymorphism
  • Interfaces & Abstract Classes
  • Special Methods & Object Class
  • Advanced OOP Concepts
  • Generics
  • Exception Handling in OOP
  • Design Patterns Part 1
  • Design Patterns Part 2
  • Project: Library Management
  • Final Challenges

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