抽象类、抽象字段、抽象方法

abstract class SuperTeacher(val name : String){
  var id : Int //抽象字段，不需要初始化
  var age : Int 
  def teach //抽象方法
}

class TeacherForMaths(name : String) extends SuperTeacher(name){
  override var id = name.hashCode()
  override var age = 29
  override def teach{
    println("Teaching!!!")
  }
}

object AbstractClassOps{
  def main(args: Array[String]) {
     val teacher = new TeacherForMaths("Spark")
     teacher.teach
     println("teacher.id" + ":" + teacher.id)
     println(teacher.name + ":" + teacher.age)
  }
}

结果：
Teaching!!!
teacher.id:80085693
Spark:29