Inheritance Basics

Inheritance Basics

A class inherits from another with class Dog(name: String) extends Animal(name), gaining all of the parent's non-private members. This models an "is-a" relationship, like a Dog being a kind of Animal. Scala only supports single inheritance for classes -- a class can extend just one direct superclass, though traits (covered later) offer another way to share behavior.

Note: Scala supports single class inheritance only -- use traits when you need to combine behavior from multiple sources.

Example: Inheritance Basics

class Animal(val name: String) {
  def eat(): Unit = println(s"$name is eating")
}

class Dog(name: String) extends Animal(name) {
  def bark(): Unit = println(s"$name says Woof!")
}

object Main extends App {
  val rex = new Dog("Rex")
  rex.eat()
  rex.bark()
}