Learn Java

Learn the basics of the popular Java language in this introductory course. ☕️

### Why Learn Java?

Java is among the most popular programming languages out there, mainly because of how versatile and compatible it is. Java can be used for a large number of things, including software development, mobile applications, and large systems development. As of 2019, 88% market share of all smartphones run on Android, the mobile operating system written in Java. Knowing Java opens a great deal of doors for you as a developer.

### Take-Away Skills

In this course you'll be exposed to fundamental programming concepts, including object-oriented programming (OOP) using Java. You'll build 7 Java projects—like a basic calculator—to help you practice along the way.

### Recently Updated

We've recently updated this course! For more information on why we did this update and how it might affect you, check out this blog post: [Learn Java Updates](https://news.codecademy.com/learn-java-updates/).

• Hello World: Welcome to the world of Java programming! Java is a popular object-oriented programming language that is used in many different industries.
• Lesson: Hello World
• Article: Java Program Structure
• Quiz: Hello World
• Project: Planting a Tree
• Article: What Is an IDE?
• Variables: Learn about datatypes in Java and how we use them. Then, practice your skills with two projects where you create and manipulate variables.
• Lesson: Learn Java: Variables
• Quiz: Java Variables Quiz
• Project: Java Variables: Mad Libs
• Lesson: Learn Java: Manipulating Variables
• Quiz: Java Variable Manipulation Quiz
• Project: Math Magic
• Object-Oriented Java: Learn about object-oriented programming in Java. Explore syntax for defining classes and creating instances.
  
  
• VideoContentItem: Classes and Objects
• Lesson: Java: Introduction to Classes
• Quiz: Intro to Java Classes
• Lesson: Learn Java: Methods
• Quiz: Java Methods Quiz
• Project: A Basic Calculator
• Project: Build A Droid
• Conditionals and Control Flow: Conditionals and control flow in Java programs.
• Lesson: Conditionals and Control Flow
• Lesson: Conditional Operators
• Quiz: Conditionals and Control Flow
• Project: A Simple Car Loan Payment Calculator
• Project: Continents and Cities
• Arrays and ArrayLists: Build lists of data with Java arrays and ArrayLists.
• Lesson: Learn Java: Arrays
• Quiz: Java Arrays Quiz
• Lesson: Learn Java: ArrayLists
• Quiz: Java ArrayList Quiz
• Project: Desert Island Playlist
• Loops: Use loops to iterate through lists and repeat code.
• Lesson: Learn Java: Loops
• Quiz: Learn Java: Loops Quiz
• Project: Fizz Buzz
• Project: The Prime Directive
• String Methods: The Java `String` class provides a lot of useful methods for performing operations on strings and data manipulation.
• Lesson: String Methods
• Quiz: String Methods
• Project: DNA Sequencing
• Access, Encapsulation, and Static Methods: Let's dive deeper into classes and learn about some of their more advanced features.
• Lesson: Access, Encapsulation, and Scope
• Quiz: Access, Encapsulation, and Scope
• Article: Static Methods of the Math Class
• Lesson: Static Variables and Methods
• Quiz: Static Variables and Methods
• Inheritance and Polymorphism: Dive deeper into object-oriented Java with inheritance and polymorphism.
• Lesson: Inheritance and Polymorphism
• Quiz: Inheritance and Polymorphism Quiz
• Project: Language Families
• Debugging: Learn about different types of errors in Java and practice finding them.
• Lesson: Debugging
• Quiz: Debugging
• Project: Bug Detective
• Two-Dimensional Arrays: Take your understanding of arrays and loops to the next dimension! Learn how to create and use two-dimensional arrays.
• Lesson: 2D Arrays: Java
• Quiz: Quiz: 2D Arrays in Java
• Project: 2D Arrays: Image Manipulation Project
• Informational: Next Steps