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documentation: http://www.scala-lang.org/documentation/
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wikipedia: https://en.wikipedia.org/wiki/Scala_(programming_language)
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scalachina: http://www.scalachina.com/portal.php
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ScalaTest: http://www.scalatest.org/
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ScalaIDE: http://scala-ide.org/
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Scala入门之高级类型:this.type: http://blog.csdn.net/pofengliuming/article/details/52163099