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Scala

Programming

For Beginners

Learn Coding Fast!

Ray Yao

Copyright 2015 by Ray Yao

All Rights Reserved

Neither part of this book nor whole of this book may be reproduced or transmitted in any form or by any means electronic, photographic or mechanical, including photocopying, recording, or by any information storage or retrieval system, without prior written permission from the author . All rights reserved !

Ray Yao

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Preface

Scala Programming covers all essential Scala language knowledge . You can learn complete primary skills of Scala programming fast and easily .
The book includes more than 60 practical examples for beginners and includes tests & answers for the college exam, the engineer certification exam, and the job interview exam .

Note:

This book is only for Scala beginners, it is not suitable for experienced Scala programmers.

Source Code for Download

This book provides source code for download; you can download the source code for better study, or copy the source code to your favorite editor to test the programs .

Source Code Download Link:

https://forms . aweber . com/form/76/1081568876 . htm

Table of Contents

Hour 1

What is Scala Language?

The Scala language is a general-purpose programming language that can be executed on the JVM and . net platforms for both large-scale application development and lightweight programming . It was developed by Martin Odersk in 2001 . Scala is widely used for its elegant type-safe programming scheme .

Scala is a pure object-oriented language with OO features, but it's also a functional language that allows you to write code with functional ideas .

Scala is built on top of the JVM and interoperates seamlessly with Java .

The great advantage of Scala: The Scala language is scalable, allowing you to write both small scripts and complex server-side programs .

The Feature of Scala

Scala is a pure object-oriented programming language

• Encapsulation/information hiding .
• Inheritance .
• Polymorphism/dynamic binding .
• All predefined types are objects .
• All operations are performed by sending messages to objects .
• All user-defined types are objects .

Scala is a functional programming language

• Higher-order functions
• Closures
• Pattern matching
• Single assignment
• Lazy evaluation
• Type inference
• Tail call optimization
• Type inference

Scala is very compatible and portable

• Scala executes on the JVM
• Scala can interoperate with JAVA
• Scala has the same platform portability as JAVA

Install JDK

Before installing Scala, you must install Java JDK first .

About JDK (also called Java SE)

JDK (Java Development Kit) contains all Java class libraries, all tool building and running Java programs . JDK can create a Java development environment .

Download JDK

http://oracle . com/download

or

http://www . oracle . com/technetwork/java/javase/downloads/index . html

Please click the link to download the newest version JDK at Oracle website . (Figure 1)

(Figure 1 Download JDK at Oracle Website)

If your computer is a 32-bit operating system, download the JDK with x86; If your computer is a 64-bit operating system, download the JDK with x64 . (Figure 2)

(Figure 2)

Install the JDK

Please install the newest version of the JDK to your computer . For example, install Java SE 12.0.1.

After installing the Java SE 12 . 0 . 1, please check the directory:

C:\Program Files\Java\jdk-12 . 0 . 1

You can find the jdk-12.0.1 in there .
Please remember the installation path and jdk version .

Configure Java Environment Variables

The following chart is the configure parameters:

Variable Name	JAVA_HOME
Variable Value	C:\Program Files\Java\jdk-12 . .
Variable Name	Path
Variable Value	; %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin ;

1 . Please click Control Panel > System > Advanced System Settings > Environment Variables

2 . Click New

3 . Input JAVA_HOME .

4 . Input C:\Program Files\Java\jdk-12 . 0 . 1

As follows:

5 . Click OK

6 . Select Path .

7 . Click Edit

8 . Append ; %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin ;

As follows:

( Note: If in Windows 10, you need to add the variable values one by one as follows: )

9 . Click OK , and restart the computer .

Test Java Environment

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