从零开始学Scala（一）——Scala环境搭建与第一行代码

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开发环境搭建

安装JDK
安装Scala， scala下载页面下载版本2.12.3
安装Intellij idea插件， Intellij idea Scala插件下载

环境搭建

1、Scala SDK安装与Idea插件安装，注意Idea插件与版本要匹配，前提是要装好JDK，参考百度上的帖子很容易

在Intellij idea中用Maven+plugin搭建Scala项目

参考帖子

Idea中新建项目scala-study
Maven构建，pom.xml如下

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>com.shannonAJ</groupId>    <artifactId>scala-study</artifactId>    <version>1.0-SNAPSHOT</version>    <dependencies>        <dependency>            <groupId>org.scala-lang</groupId>            <artifactId>scala-library</artifactId>            <version>2.12.3</version>        </dependency>        <dependency>            <groupId>org.scala-lang</groupId>            <artifactId>scala-compiler</artifactId>            <version>2.12.3</version>        </dependency>        <dependency>            <groupId>org.scala-lang</groupId>            <artifactId>scala-reflect</artifactId>            <version>2.12.3</version>        </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-api</artifactId>            <version>1.7.21</version>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.scala-tools</groupId>                <artifactId>maven-scala-plugin</artifactId>                <version>2.15.1</version>                <executions>                    <execution>                        <goals>                            <goal>compile</goal>                            <goal>testCompile</goal>                        </goals>                    </execution>                </executions>            </plugin>        </plugins>    </build></project>1
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main下添加Java package和 scala package
HelloScala.Scala

package com.shannonAJ.scala/**  * Created by ShannonAJ on 2017/8/13.  */class HelloScala {  def sayHello(x:String): Unit = {      print("Hello " + x);  }}1
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5.HelloDemo.java

package com.shannonAJ.task;import com.shannonAJ.scala.HelloScala;/** * Created by ShannonAJ on 2017/8/13. */public class HelloDemo {    public static void main(String[] args) {        System.out.println("use scala class");        HelloScala hello = new HelloScala();        hello.sayHello("scala");    }}1
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编译

mvn clean scala:compile compile1

运行结果

use scala classHello scalaProcess finished with exit code 01
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