Scala之上界

//上界 <:class Pair[T <: Comparable[T]] {   def shuishuai(first:T,second:T):T={     if(first.compareTo(second)<0) first else second   }}object  Test{  def main(args: Array[String]): Unit = {    val pair = new Pair[Boy]();    val first = new Boy("wyf",99)    val second = new Boy("xiaoli",88)    var shuaige = pair.shuishuai(first, second)    println(shuaige)  }}