如果我理解你的話，你已經通過覆蓋 equals 完成了大部分的努力 - 當然你 MUST 也相應地覆蓋 hashCode 例如：

case class Thing(id:Long, foo:String, bar:Int) {

override def equals(that:Any):Boolean = {

that match {

case Thing(_, f, b) => (f == this.foo) && (b == this.bar)

case _ => false

}

}

override def hashCode:Int = {

// A quick hack. You probably shouldn't do this for real;

// set id to 0 and use the default hashing algorithm:

ScalaRunTime._hashCode(this.copy(id = 0))

}

}

現在我們定義一些 Thing 實例：

val t1 = Thing(111, "t1", 1)

val t1c = Thing(112, "t1", 1) // Same as t1 but with a new ID

val t2 = Thing(222, "t2", 2)

val t3 = Thing(333, "t3", 3)

val t4 = Thing(444, "t4", 4)

val t4m = Thing(444, "t4m", 4) // Same as t4 but with a modified "foo"

讓我們做幾個序列：

val orig = Seq(t1, t2, t3, t4)

val mod = Seq(t1c, t2, t3, t4m)

現在diff告訴我們我們需要知道的一切：

mod.diff(orig)

// => returns Seq(t4m) - just what we wanted

總結

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