[原創]Scala學習:編寫Scala腳本


scala支持腳本

  1)在/opt/scala-script下創建一個文件hello.scala 編輯內容如下:

   $ hello ,this is the first scala script

  2)運行腳本

    

 

scala腳本的命令行參數保存在名為args的scala數組中。scala里,數組以0開始,可以通過在括號里指定索引值來訪問數組元素。scala里數組 args 的第一個元素是:args(0),而不是像Java那樣的:args[0]。現在,把以下內容寫到新文件:

 HelloWithArgs.scala中測試一下:

//向第一個參數打問好      println("hello :"+ args(0))

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

root@scala:/opt/scala-script#scala hello.scala
java.net.UnknownHostException: scala: scala: unknown error
at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
at scala.tools.nsc.io.Socket$.localhost(Socket.scala:28)
at scala.tools.nsc.CompileSocket.getsock$1(CompileSocket.scala:175)
at scala.tools.nsc.CompileSocket.getOrCreateSocket(CompileSocket.scala:190)
at scala.tools.nsc.ScriptRunner.compileWithDaemon(ScriptRunner.scala:70)
at scala.tools.nsc.ScriptRunner.scala$tools$nsc$ScriptRunner$$compile$1(ScriptRunner.scala:113)
at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply$mcZ$sp(ScriptRunner.scala:161)
at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply(ScriptRunner.scala:129)
at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply(ScriptRunner.scala:129)
at scala.tools.nsc.util.package$.trackingThreads(package.scala:43)
at scala.tools.nsc.util.package$.waitingForThreads(package.scala:27)
at scala.tools.nsc.ScriptRunner.withCompiledScript(ScriptRunner.scala:128)
at scala.tools.nsc.ScriptRunner.runScript(ScriptRunner.scala:192)
at scala.tools.nsc.ScriptRunner.runScriptAndCatch(ScriptRunner.scala:205)
at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:67)
at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
Caused by: java.net.UnknownHostException: scala: unknown error
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getLocalHost(InetAddress.java:1500)
... 18 more


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