override case class method in scala

问题

I am trying to override a method of trait in my case class which want to display all the members of case class. I am using it for debugging purpose.

trait A{
   def myMethod(employee:Emp):Unit
}

case class Emp(id:String,name:String) extends A {
   override def myMethod(employee: Emp): Unit = 
              emp.productIterator.toList.foreach(println)
}

other possible way to do this is

    emp.productIterator.toList.mkString("\n")

to declare Emp("10","abc"). I am new to Scala, not sure how to call the override method of trait.

I am not sure if any other generic way to achieve this functionality to get string form of case class members.
Efficient way to use trait and case class to achieve this functionality.I want to understand how apply method and companion objects can be implemented .
I want to implement logging instead of using println. Can anyone suggest a tutorial for it?

回答1:

Previous answer was because i didn't understood your question right. This should answer your question:

If you want this only for debugging purposes you can use it like that:

trait A{
  def myMethod(employee:Emp):Unit
}

case class Emp(id:String,name:String) extends A {
  override def myMethod(employee: Emp): Unit =
    this.productIterator.toList.foreach(println)
}

Emp("1", "2").myMethod(None.orNull)

But more logical would be to use object with this nonGeneric method:

case class Emp(id:String,name:String)

object A{
  def myMethod(employee: Emp):Unit = {
    employee.productIterator.toList.foreach(println)
  }
}

A.myMethod(Emp("1", "2"))

For logging purposes you can use just apache log4j

来源：https://stackoverflow.com/questions/45566851/override-case-class-method-in-scala

标签

scala

case-class