我有一个实现一种方法的抽象类。
我如何访问参数internalValue（由抽象类构造函数设置？）
abstract class Value(internalValue:Int) {
def equal( v:Value ): Boolean
def notEqual( v:Value ): Boolean = {
//here I get an error on v.internalValue:
//"value internalValue is not a member of Value"
(internalValue != v.internalValue)
}
}
case class Value1(internalValue:Int) extends Value(internalValue){
def equal( v:Value1 ): Boolean = {
//this works correctly
(internalValue == v.internalValue)
}
}
谢谢。
Define internalValue to be val:
abstract class Value(val internalValue: Int)
或者如果您担心封装（名称internalValue建议）你可以使用private val:
abstract class Value(private val internalValue: Int)
Not declaring any modified at all is effectively equivalent (?) similar to private[this] which means: only this particular instance of Value can access this private field.
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