小编Bus*_*Bee的帖子

在典型的 Scala 上限示例中

abstract class Animal {
  def name: String
}

abstract class Pet extends Animal {}

class Cat extends Pet {
  override def name: String = "Cat"
}

class Dog extends Pet {
  override def name: String = "Dog"
}

class Lion extends Animal {
  override def name: String = "Lion"
}

这有什么区别

class PetContainer[P <: Pet](p: P) {
      def pet: P = p
    }

val dogContainer = new PetContainer[Dog](new Dog)
val catContainer = new PetContainer[Cat](new Cat)

和这个？

class …