What is Scala?
This article mainly explains "what is Scala". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what is Scala?"
1.1.What is Scala
Scala is a multi-paradigm programming language, which is designed to integrate the features of object-oriented programming and functional programming. Scala runs on the Java platform (Java virtual machine) and is compatible with existing Java programs.
Why do you want to learn Scala
1. Elegance: this is the first consideration for framework designers. The users of the framework are application development programmers, and the elegance of API directly affects the user experience.
two。 Speed: the Scala language is expressive, one line of code is worth Java, and the development speed is fast; Scala is statically compiled, so it is much faster than JRuby,Groovy.
3. Can integrate into the Hadoop ecosystem: Hadoop is now the de facto standard of big data, Spark is not to replace Hadoop, but to improve the Hadoop ecology. Most of the JVM language may think of Java, but the API made by Java is too ugly, or it takes too much effort to implement an elegant API.
2. Install Scala compiler 2.1and install JDK
Because Scala runs on the JVM platform, install JDK before installing Scala
2.2. install Scala2.2.1, Windows install Scala compiler
Visit the Scala official website http://www.scala-lang.org/ to download the Scala compiler installation package. The latest version is 2.12.x, but most of the frameworks are written and developed in 2.10.x, so 2.10.x is recommended here. Click next after downloading scala-2.10.6.msi.
2.2.2. Linux installs the Scala compiler
Download the Scala address http://downloads.typesafe.com/scala/2.10.6/scala-2.10.6.tgz and extract the Scala to the specified directory
Tar-zxvf scala-2.10.6.tgz-C / usr/java
Configure environment variables to add scala to PATH
Vi / etc/profile
Export JAVA_HOME=/usr/java/jdk1.7.0_45
Export PATH=$PATH:$JAVA_HOME/bin:/usr/java/scala-2.10.6/bin
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