小编ton*_*057的帖子

我有一个简单的类和一个伴随对象的应用方法重载:

case class A(val s: String,
         val x: Int,
         val y: Int,
         val z: Int,
         val foo: Int => Int,
         val l: Option[List[String]])

object A {
    def apply(s: String, x: Int, y: Int, z: Int, foo: Int => Int) =
        new A(s, x, y, z, foo, None)

    def apply(s: String, x: Int, y: Int, z: Int, foo: Int => Int, l: List[String]) =
        new A(s, x, y, z, foo, Some(l))
}

我们还定义一个函数:

def foo(x: Int): Int = x + 1 …