exception.scala

##例外処理
scala> val n = try{"99".toInt} catch {case e:Exception => -99}
n: Int = 99

scala> val n = try{"999".toInt} catch {case e:Exception => -99}
n: Int = 999

scala> val n = try{ "momo".toInt } catch { case e:Exception => -99 }
n: Int = -99


##例外処理2
scala> val n = try{ "momo".toInt } catch {
     | case e:Exception => -1 } finally { println("finally"); }
finally
n: Int = -1

##例外処理1
scala> def toIntOption(s: String):Option[Int] = try{Some(s.toInt)} catch{case _ => None}
toIntOption: (s: String)Option[Int]

scala> val n = toIntOption( "foo" ) getOrElse( -1 )
n: Int = -1

scala> val n = toIntOption( "100" ) getOrElse( -1 )
n: Int = 100

scala> val n = toIntOption( "-100" ) getOrElse( -1 )
n: Int = -100