经过很多玩这个,我想出了一个非常简单的解决方案。 以下是完整的程序
package manytypes
abstract class Field {
type T
val data: List[T]
def add (a: T, b: T): T
}
abstract class FieldInt extends Field {
type T = Int
def add (a: T, b: T): T = a + b
}
abstract class FieldDouble extends Field {
type T = Double
def add (a: T, b: T): T = a + b
}
abstract class FieldString extends Field {
type T = String
def add (a: T, b: T): T = a + b
}
object A extends App {
val ints: Field = new FieldInt { val data = List(1, 2, 3)}
val doubles: Field = new FieldDouble { val data = List(1.2, 2.3, 3.4) }
val strings: Field = new FieldString { val data = List("hello ", "this is ", "a list ")}
val fields: List[Field] = List(ints, doubles, strings)
for (field <- fields) println(field.data.reduceLeft(field.add(_, _)))
}
我该如何使它与Ints,浮动和字符串一起工作? –
@CodeChords man:检查编辑。 – missingfaktor