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sCAlA.mAtChError

一、简单例子: 1 abstract class Expr 2 case class Var(name:String) extends Expr 3 case class Number(num:Double) extends Expr 4 case class UnOp(operator : String , arg : Expr) extends Expr 5 case class BinOp(operator : String , ...

object MatchTest extends App { val weekString = Vector("星期一","星期二","星期三","星期四","星期五","星期六","星期日") import scala.io.StdIn while(true){ val line = StdIn.readLine("please input a number to get week day name, -1...

Object不能直接转化成Integer 你首先需要把它转化成String list.get(i).toString(); 再使用 Integer.valueOf(list.get(i).toString()); 有很多转化都...

val s1="100"val r1=scala.util.Try(s1.toInt)val result = r1 match { case Success(_) => "Int" ; case _ => "NotInt" }

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