{"id":26737,"date":"2016-12-05T03:01:36","date_gmt":"2016-12-04T17:01:36","guid":{"rendered":"http:\/\/www.rjmprogramming.com.au\/ITblog\/?p=26737"},"modified":"2022-05-04T13:27:14","modified_gmt":"2022-05-04T03:27:14","slug":"scala-hello-world-primer-tutorial","status":"publish","type":"post","link":"https:\/\/www.rjmprogramming.com.au\/ITblog\/scala-hello-world-primer-tutorial\/","title":{"rendered":"Scala Hello World Primer Tutorial"},"content":{"rendered":"
\"Scala<\/a>

Scala Hello World Primer Tutorial<\/p><\/div>\n

The Scala<\/a> programming language is a burgeoning force in Information Technology …<\/p>\n

\nObject-Oriented Meets Functional
\n 
\nHave the best of both worlds. Construct elegant class hierarchies for maximum code reuse and extensibility, implement their behavior using higher-order functions. Or anything in-between.\n<\/p><\/blockquote>\n

… and we want to find out more about it, so today we start down that long and winding road. So where else would a beginner begin, barring running a complete sample project, as to construct our own Hello World Scala application, with a lot of help from others (thanks), ourselves.<\/p>\n

Steps in getting together a Scala command line Hello World application, and to ready the NetBeans 8.0.2 IDE for Scala Sbt Project creations into the future, given our NetBeans 8.0.2 \/ No Scala \/ Java SE 1.7 starting point, involved …<\/p>\n

    \n
  1. Java SE 1.8 is needed for Scala (via sbt) work and we installed via HTTP:\/\/www.oracle.com\/technetwork\/java\/javase\/downloads\/jdk8-downloads-2133151.html<\/a>\n<\/li>\n
  2. Install Scala 2.12.0 via https:\/\/www.scala-lang.org\/download\/<\/a>\n<\/li>\n
  3. Make it work on command line in our \/usr\/local\/bin\/scala-2.12.0 base directory, on our command line (via Terminal) $PATH\n<\/li>\n
  4. Advice of https:\/\/www.macports.org\/install.php<\/a> had us reinstalling Xcode command line tools from Apple Developer Store because of recent upgrade of Mac OS X to macOS Sierra Version 10.12.1 … followed by
    \n
    \nsudo xcodebuild -license
    \n<\/code>\n<\/li>\n
  5. Reinstall base Macports via Download button of https:\/\/www.macports.org\/install.php<\/a> because of recent upgrade of Mac OS X to macOS Sierra Version 10.12.1\n<\/li>\n
  6. Install sbt version 0.13.11 via Macports …
    \n
    \nsudo port install sbt
    \n<\/code>
    \n … alternatively install via     sbt landing page<\/a> …<\/p>\n

    \nThe interactive build tool
    \n 
    \nUse Scala to define your tasks. Then run them in parallel from the shell.\n<\/p><\/blockquote>\n<\/li>\n

  7. Start up NetBeans 8.0.2\n<\/li>\n
  8. Tools -> Java Platforms show Java SE 1.8\n<\/li>\n
  9. Tools -> Scala Platforms shows no relationships\n<\/li>\n
  10. Tools -> Plugins -> Available Plugins … Sort and check all the Scala ones and -> Install … as you can see a bit of with today’s tutorial picture<\/a>\n<\/li>\n
  11. Tools -> Scala -> Sources tab -> Add JAR\/Folder… and add all the *.jar in \/usr\/local\/bin\/scala-2.12.0\/lib directory\n<\/li>\n
  12. At Terminal command line …
    \n
    \n$ cd $HOME
    \n$ pwd
    \n\/Library\/pgAgent
    \n$ mkdir scala_sbt_hello_world
    \n$ cd scala_sbt_hello_world
    \n$ echo 'object Hi { def main(args: Array[String]) = println(\"Hello World ... Scala fans!\") }' > helloworld.scala
    \n$ sbt
    \nJava HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=384m; support was removed in 8.0
    \n[info] Set current project to scala_sbt_hello_world (in build file:\/Library\/pgAgent\/scala_sbt_hello_world\/)
    \n> run
    \n[info] Updating {file:\/Library\/pgAgent\/scala_sbt_hello_world\/}scala_sbt_hello_world...
    \n[info] Resolving org.fusesource.jansi#jansi;1.4 ...
    \n[info] Done updating.
    \n[info] Compiling 1 Scala source to \/Library\/pgAgent\/scala_sbt_hello_world\/target\/scala-2.10\/classes...
    \n[info] 'compiler-interface' not yet compiled for Scala 2.10.6. Compiling...
    \n[info] Compilation completed in 24.13 s
    \n[info] Running Hi
    \nHello World ... Scala fans!
    \n[success] Total time: 44 s, completed 04\/12\/2016 3:37:10 PM
    \n> exit
    \n$
    \n<\/code>\n<\/li>\n<\/ol>\n

    Great help (thanks heaps) came from …<\/p>\n