Example
A trait is a reusable set of methods and fields that can be added to one or more classes.
trait BarkingAbility {
String bark(){ "I'm barking!!" }
}
They can be used like normal interfaces, using implements keyword:
class Dog implements BarkingAbility {}
def d = new Dog()
assert d.bark() = "I'm barking!!"
Also they can be used to implement multiple inheritance (avoiding diamond issue).
Dogs can scratch his head, so:
trait ScratchingAbility {
String scratch() { "I'm scratching my head!!" }
}
class Dog implements BarkingAbility, ScratchingAbility {}
def d = new Dog()
assert d.bark() = "I'm barking!!"
assert d.scratch() = "I'm scratching my head!!"
