How to properly extend and implement method sendEmail from Person trait (interface) inside Employee object bellow in order for main to execute:
trait Person {
var name:String
var gender:Char
def sendEmail(subject:String, body:String)
}
object Employee extends Person {
def main(args: Array[String]): Unit = {
println("Hello")
sendEmail("a", "b")
def sendEmail(subject:String, body:String): Unit = {
println("subject" + body)
}
}
}
You'll need to implement all members and methods declared in trait Person. Also, assuming you have multiple employees, class (or case class) might be more suitable than object:
trait Person {
val name: String
val gender: Char
def sendEmail(subject: String, body: String): Unit
}
class Employee(val name: String, val gender: Char) extends Person {
def sendEmail(subject: String, body: String): Unit =
println(s"subject: $subject\n body: $body")
}
object ListEmployees {
def main(args: Array[String]) {
val emp1 = new Employee("Dave", 'M')
val emp2 = new Employee("Jenn", 'F')
emp1.sendEmail("yo", "yo yo yo")
emp2.sendEmail("boo", "boo boo boo")
}
}
ListEmployees.main(Array())
// subject: yo
// body: yo yo yo
// subject: boo
// body: boo boo boo
ListEmployees.main(Array())? (it works without it)
ListEmployees.main() on Scala REPL.The method needs to be a member of the object rather than a function inside another function (main). Try:
object Employee extends Person {
def sendEmail(subject:String, body:String): Unit = {
println("subject" + body)
}
def main(args: Array[String]): Unit = {
println("Hello")
sendEmail("a", "b")
}
}
Error:(10, 8) object creation impossible, since: it has 2 unimplemented members. /** As seen from object Employee, the missing signatures are as follows. * For convenience, these are usable as stub implementations. */ def gender_=(x$1: Char): Unit = ??? def name_=(x$1: String): Unit = ??? object Employee extends Person {
name and gender, something like var name = "Joe" and something similar for gender should suffice