java.lang.Boolean to scala.Boolean question
georgii@gleontiev:~$ scala
Welcome to Scala version 2.8.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_24).
Type in expressions to have them evaluated.
Type :help for more information.
scala> val jbool = java.lang.Boolean.TRUE
jbool: java.lang.Boolean = true
scala> val sbool = true
sbool: Boolean = true
scala> def sboolMethod(sbool: Boolean) = print("got scala.Boolean " + sbool)
sboolMethod: (sbool: Boolean)Unit
scala> sboolMethod(sbool)
got scala.Boolean true
scala> sboolMethod(jbool)
<console>:9: error: type mismatch;
found : java.lang.Boolean
required: scala.Boolean
sboolMethod(jbool)
^
scala> implicit def jbool2sbool(bool: java.lang.Boolean): scala.Boolean = bool.booleanValue
jbool2sbool: (bool: java.lang.Boolean)Boolean
scala> sboolMethod(jbool)
got scala.Boolean true
A questão é: por que não há uma conversão implícita padrão dejava.lang.Boolean
parascala.Boolean
? A pergunta também significajava.lang.Long
vsscala.Long
e provavelmente outros tipos padrão (ainda não tentei todos