example1.scala #daimonscala 21

gistfile1.scala

object Person {
  val DEFAULT_NAME = "anonymous"
}

class Person(var name: String) {
  def this() {
    this(Person.DEFAULT_NAME)
  }
  def canWriteCode = false
}

class Programmer1(name: String) extends Person(name) {
  override def canWriteCode = true
}

trait ProgrammingSkill { _: Person =>
  override def canWriteCode = true
}

class Programmer2(name: String) extends Person(name) with ProgrammingSkill

val person = new Person
println(person.name) // anonymous
person.name = "foo"
println(person.name) // foo
println(person.canWriteCode) // false

val brian = new Person("Brian") with ProgrammingSkill
println(brian.name) // Brian
println(brian.canWriteCode) // true

val andy = new Programmer1("Andy")
println(andy.name) // Andy
println(andy.canWriteCode) // true

val kaz = new Programmer2("Kaz")
println(kaz.name) // Kaz
println(kaz.canWriteCode) // true

// compatible with JavaBean
import reflect.BeanProperty
class Person(@BeanProperty var name: String) {
  def this() {
    this(Person.DEFAULT_NAME)
  }
  def canWriteCode = false
}

val person = new Person
println(person.name) // anonymous
println(person.getName()) // anonymous
person.setName("renamed")
println(person.getName()) // renamed
println(person.canWriteCode) // false