也许productIterator就是您想要的：

scala> case class C(x: Int, y: String, z: Char)
defined class C

scala> val c1 = C(1, "2", 'c')
c1: C = C(1,2,c)

scala> c1.productIterator.toList
res1: List[Any] = List(1, 2, c)

扩展@Malte_Schwerhoff的答案，您可能会创建一个递归的diff方法，该方法不仅生成差异的索引，而且将它们Map到该索引处的新值-或者在嵌套的Product类型的情况下，Map到子Product差异的Map：

def diff(orig: Product, update: Product): Map[Int, Any] = {
  assert(orig != null && update != null, "Both products must be non-null")
  assert(orig.getClass == update.getClass, "Both products must be of the same class")

  val diffs = for (ix <- 0 until orig.productArity) yield {
    (orig.productElement(ix), update.productElement(ix)) match {
      case (s1: String, s2: String) if (!s1.equalsIgnoreCase(s2)) => Some((ix -> s2))
      case (s1: String, s2: String) => None
      case (p1: Product, p2: Product) if (p1 != p2) => Some((ix -> diff(p1, p2)))
      case (x, y) if (x != y) => Some((ix -> y))
      case _ => None
    }
  }

  diffs.flatten.toMap
}

对该答案中的用例进行扩展：

case class A(x: Int, y: String)
case class B(a: A, b: AnyRef, c: Any)

val a1 = A(4, "four")
val a2 = A(4, "Four")
val a3 = A(4, "quatre")
val a4 = A(5, "five")
val b1 = B(a1, null, 6)
val b2 = B(a1, null, 7)
val b3 = B(a2, a2, a2)
val b4 = B(a4, null, 8)

println(diff(a1, a2)) // Map()
println(diff(a1, a3)) // Map(0 -> 5)
println(diff(a1, a4)) // Map(0 -> 5, 1 -> five)

println(diff(b1, b2)) // Map(2 -> 7)
println(diff(b1, b3)) // Map(1 -> A(4,four), 2 -> A(4,four))
println(diff(b1, b4)) // Map(0 -> Map(0 -> 5, 1 -> five), 2 -> 8l

如果要使用非标准相等(如String.equalsIgnoreCase)，则可以使用乘积迭代器，并对元素进行匹配。

def compare(p1: Product, p2: Product): List[Int] = {
  assert(p1 != null && p2 != null, "Both products must be non-null")
  assert(p1.getClass == p2.getClass, "Both products must be of the same class")

  var idx = List[Int]()

  for (i <- 0 until p1.productArity) {
    val equal = (p1.productElement(i), p2.productElement(i)) match {
      case (s1: String, s2: String) => s1.equalsIgnoreCase(s2)
      case (x, y) => x == y
    }

    if (!equal) idx ::= i
  }

  idx.reverse
}

使用案例：

case class A(x: Int, y: String)
case class B(a: A, b: AnyRef, c: Any)

val a1 = A(4, "four")
val a2 = A(4, "Four")
val a3 = A(5, "five")
val b1 = B(a1, null, 6)
val b2 = B(a1, null, 7)
val b3 = B(a2, a2, a2)

println(compare(a1, a2)) // List()
println(compare(a1, a3)) // List(0, 1)

println(compare(b1, b2)) // List(2)
println(compare(b2, b3)) // List(0, 1, 2)

// println(compare(a1, b1)) // assertion failed

如果您想访问字段名，可以使用Java的反射API。在本例中，您可以使用getDeclaredFields方法访问声明的字段并迭代这些字段。如果您随后想要访问字段的值更改，则需要将其设置为可访问(setAccessible方法)，因为默认情况下，所有类参数都实现为具有公共访问器的私有字段。

val c = C(1, "C", 'c'))
for(field <- c.getClass.getDeclaredFields) {
  println(field.getName)
  field.get(c)
}