scala构造器实战

父类

abstract class Event(val name:String) {
  var time:Long
  var content:String
}

 子类

private[spark] class BaseEvent(name: String) extends Event(name) {
  var id: String = _ 
  override var time: Long = _
  override var content: String = _
  //从构造器
  def this(id:String,name:String,time:Long,content:String){
    this(name)//主构造器
    this.id = id
    this.time = time
    this.content = content
  }
  //重写toString
  override def toString():String ={
    id+","+name+","+time+","+content
  }

}

 再子类

private[spark] class AlarmEvent(name: String) extends BaseEvent(name) {

  var event_type: String = _
  var event_level: String = _
  var event_src_ip: String = _
  var event_src_port: String = _
  var event_tar_ip: String = _
  var event_tar_port: String = _
  var event_src_server_name: String = _
  var event_tar_server_name: String = _
  var event_group_count: Long = _
  var event_group_start_time: String = _
  var event_group_end_time: String = _
  var event_server_name: String = _

  def this(id: String, name: String, time: Long, content: String) {
    this(name)
    this.id = id
    this.time = time
    this.content = content
  }
  //构造器的继承与重载
  def this(id: String,
           name: String,
           time: Long,
           content: String,
           event_type: String,
           event_level: String,
           event_src_ip: String,
           event_src_port: String,
           event_tar_ip: String,
           event_tar_port: String,
           event_src_server_name: String,
           event_tar_server_name: String
          ) {
    this(name, id, time, content)
    this.event_type = event_type
    this.event_level = event_level
    this.event_src_ip = event_src_ip
    this.event_src_port = event_src_port
    this.event_src_server_name = event_src_server_name
    this.event_tar_ip = event_tar_ip
    this.event_tar_port = event_tar_port
    this.event_tar_server_name = event_tar_server_name
  }
  //重载
  def this(id: String,
           name: String,
           time: Long,
           content: String,
           event_type: String,
           event_level: String,
           event_src_ip: String,
           event_src_port: String,
           event_tar_ip: String,
           event_tar_port: String,
           event_src_server_name: String,
           event_tar_server_name: String,
           event_group_count: Long,
           event_group_start_time: String,
           event_group_end_time: String,
           event_server_name: String
          ) {
    this(name, id, time, content, event_type, event_level,event_src_ip,event_src_port,event_tar_ip,event_tar_port,event_src_server_name,event_tar_server_name)
    this.event_group_count=event_group_count
    this.event_group_start_time=event_group_start_time
    this.event_group_end_time=event_group_end_time
    this.event_server_name=event_server_name
  }
  //toString的继承重载
  override def toString():String= {
  super.toString() +","+ event_type + "," + event_level + "," + event_src_ip + "," + event_src_port +","+ event_src_server_name + "," + event_tar_ip + "," + event_tar_port + "," + event_tar_server_name
  }

}

 执行结果：

2,1,0,3,4,5,6,7,9,80,8,00

   scala语言的父类继承和重载，toString的继承重载，靠super

   子类中的构造器不能够super，报错