Java Jump Start

A powerful language demystified.

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Java Jump Start is a comprehensive guide designed to help you quickly learn the amazing abilities of Java. This guide will provide you will all the essentials in syntax as well as the unique features of Java.

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Get Started

Easiest Option

You can create a GitHub Codespace under the green Code button. This will create an IDE for you in the browser.

Create a Codespace with Code Button

Load the Codespace Environment

bash ./init_codespace.sh

source ~/.bashrc

Most Customizable Option

Clone the repository to your local machine using the following command.

git clone https://github.com/theoliverlear/Java-Jump-Start.git

Run the Java Code

Running the Java code, with modern Java, only requires the java command.

For all files, except Script.java, run:

java ExampleFile.java

For Script.java, run:

java --enable-preview Script.java

Table of Contents

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Chapter 0: Introduction

• What is Java?
  • Java is a high-level, object-oriented programming language that is designed to run anywhere at anytime, securely.
• Why Java?
  • Java is fast, secure, and well-maintained with many libraries still used in enterprise like Spring Boot.
• What is a compiled language?
  • Java, as a compiled language, is converted into bytecode before any execution. This bytecode is then run on the Java Virtual Machine (JVM).
• Transitions to Java
  • Familiar Syntax

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Chapter 1: Syntax

• Basic Syntax
• Datatypes
• Wrappers

Chapter 2: Functions through Classes

• Functions

Chapter 3: Conditionals

• Conditions

Chapter 4: Loops

• Loops

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Exercise One: Lottery Ticket Winnings with Loops

• Exercise

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Chapter 5: Input Data

• User Input

Chapter 6: Errors

• Handling Errors
• Creating Custom Errors
• Use Errors for Hardware Protection

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Exercise Two: Read Different Software Development Jobs from a File

• Exercise
  • Input File

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Chapter 7: Data Structures

• Arrays and Lists
• Maps
• Unique Lists
• Stacks

Chapter 8: Object-Oriented Programming

• Objects and Classes
  • Base Class
    • Derived Class
    • Derived Class
  • Polymorphism
    • Creating New Forms
• Enums
• Generics
  • Generic Methods

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Exercise Three: Command Students in a Class (With a Class)

• Exercise
  • Student Model

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Chapter 9: Behavioral Programming

• Interfaces
  • Implementing Behavior
• Behavior and Data
  • Inheritor and Implementor
  • Inheritor and Implementor
• Case by Case Behavior (Lambdas)
  • Implementing Lambdas

Chapter 10: Streams

• Creating Streamable Data
• Implementing Streams

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Exercise Four: Text Validation with Lambdas

• Exercise
  • Validator

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Congrats!

You have completed the Java Jump Start guide. You are now ready to not only use and understand Java, but make use of all the features that makes Java so special.