Java Tutorial — One-Page Cheat Sheet

Object-oriented, runs everywhere on the JVM.

Java Tutorial

• HOME
• Intro
• Get Started
• Syntax
• Variables
• Data Types
• Operators
• Strings
• Math
• if / else
• switch
• for / while
• Arrays
• Methods

OOP

• Classes & Objects
• Constructors
• Access Modifiers
• Inheritance
• Polymorphism
• Abstract Classes
• Interfaces
• Enums
• Records
• Generics

Collections & Streams

• Collections Framework
• List / ArrayList
• Map / HashMap
• Set / HashSet
• Streams API
• Optional
• Lambdas
• Date / Time

Practical Java

• Exceptions
• try-with-resources
• Files (NIO)
• Threads & Concurrency
• JDBC
• Maven / Gradle
• JUnit
• Spring Boot Intro

Examples

• Examples
• Cheatsheet
• Quiz
• Exercises
• Bootcamp
• Certificate
• Summary