Object(1) 等于 Object.apply(1)
Object(1) = 2 等于 Object.update(1,2)

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object A{
    def apply(){println("object A apply")}
    def update(value: String){println("object A update")}
}

object ApplyAndUpdate extends App {
    val a = A
    a() // = A.apply()
    a() = "" // = A.update("")
}