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Scala installation and development environment configuration tutorial

2022-04-21 12:15:00 【smileNicky】

development environment ：

jdk1.8+
IntelliJ IDEA 2018
Scala2.11.12

1、Scala Language Overview

Scala Language Overview ：Scala Language is a language based on Java The virtual machine is the running environment , A static language that supports object-oriented and functional programming ,java Language is object-oriented , So the code will be relatively more modular when written , Functional programming language is relatively simple .

Development process ： Martin of the Federal Institute of Technology · Odysky （Martin Odersky） On 2001 Design began in Scala. Martin · Odesky is a fan of compilers and programming , After a long time of programming , Hope to invent a language , It can make the basic work of writing programs more efficient , Simple . Martin · Odersky yes JAVA This door is portable , Running on the network , And the language of garbage collection has generated great interest , So I decided to integrate the features of functional programming language into JAVA in , Two languages have been invented （Pizza & Scala）

Scala Language website ：https://scala-lang.org/
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Add ：

Static language ： Static language （ Strong type language ） Is a language that can be determined by the data type of compile time variables , Most static languages require that data types be declared before variables are used . such as Java、C、C++、C# etc. .

Dynamic language ： Dynamic language （ Weak type language ） It is the language that determines the data type at run time , There is no need to declare the type of a variable before it is used . such as Php、Asp、JavaScript、Python、Perl wait

1、Scala Download and install

Scala The program is running in java The virtual machine , So you need to install it first jdk, Be careful jdk Version and scala Compatibility , Please refer to the official document for details ：https://docs.scala-lang.org/overviews/jdk-compatibility/overview.html
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stay Scala Official website https://www.scala-lang.org/download/all.html, Find all version download pages ：
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3.x The download link of the version is placed in GitHub 了 , So go to GitHub download

GitHub releases link ：https://github.com/lampepfl/dotty/releases/tag/3.1.2, download scala3-3.1.2.tar.gz, scala3-3.1.2.zip Fine

Scala2.x The version can be downloaded directly from the official website , There is no need to GitHub download ,scala-2.11.12.msi Is the installation version ,scala-2.11.12.zip Yes. window The green version
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Environment variable configuration ： Create a new one SCALA_HOME Variable
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stay path add Scala environment variable %SCALA_HOME%\bin

cmd Window run , Input scala

3、IDEA according to Scala plug-in unit

Developing software can choose idea perhaps Eclipse Fine , This article takes idea For example , Click on File->Setting, find Plugins plug-in unit , Search for scala, Click on the install Install
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Once installed , Need to restart IDEA that will do

4、 establish Scala project

choice File->New, choice New Project, choice Scala->IDEA, Click on Next
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because jdk The version is 1.8 Of , So you can only select the corresponding Scala Sdk edition 2.x Of

After the project is created , Select project , Right click ->New->Scala class, Create a new class ：

package com.scala.sample


object ScalaSample {
    

    def main(args: Array[String]): Unit = {
    
      println("Hello, Scala developer!")
    }
}

Create a new one Application To run the Scala Program , choice main class
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5、maven Way to create scala project

Of course , You can also create a new maven Project to run Scala,File->New->New Project, choice maven project ：
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And then choose jdk and scala sdk that will do , Same as above , All are next Operate in one step

then , After the new project ,File -> Project Structure, stay Project Settings ->Libraries page , Click on + newly added , choice Scala Sdk, Find the previously downloaded scala Just follow the directory , And then it pops up ,Choose Modules page , Select the item just now
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then , This maven The project also supports scala 了 , Similarly, right click ->New->Scala Class, Create a new one Scala class ：