惠水网站建设,简单的网页设计作品下载,谁能帮我做网站,开平设计网站如果我理解你的话#xff0c;你已经通过覆盖 equals 完成了大部分的努力 - 当然你 MUST 也相应地覆盖 hashCode 例如#xff1a;case class Thing(id:Long, foo:String, bar:Int) {override def equals(that:Any):Boolean {that match {case Thing(_, f, b) (f this.f…如果我理解你的话你已经通过覆盖 equals 完成了大部分的努力 - 当然你 MUST 也相应地覆盖 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 shouldnt do this for real;// set id to 0 and use the default hashing algorithm:ScalaRunTime._hashCode(this.copy(id 0))}}现在我们定义一些 Thing 实例val t1 Thing(111, t1, 1)val t1c Thing(112, t1, 1) // Same as t1 but with a new IDval 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让我们做几个序列val orig Seq(t1, t2, t3, t4)val mod Seq(t1c, t2, t3, t4m)现在diff告诉我们我们需要知道的一切mod.diff(orig)// returns Seq(t4m) - just what we wanted
