Scala 中 Any 类源码

package scala
abstract class Any {
  def equals(that: Any): Boolean  //值比较
  def hashCode(): Int  //hash值
  def toString(): String  
  final def getClass(): Class[_] = sys.error("getClass")  
  final def ==(that: Any): Boolean = this equals that  // 值比较，支持 null
  final def != (that: Any): Boolean = !(this == that)  // 值比较
  final def ## : Int = sys.error("##")  // hash值，支持 null
  final def isInstanceOf[T0]: Boolean = sys.error("isInstanceOf") //是否为 T0 实例
  final def asInstanceOf[T0]: T0 = sys.error("asInstanceOf") //强转为 T0
}