Method Overriding in Scala

class Dog {
    def bark(): Unit = { println("Woof!") }
}
class Puppy extends Dog {
    override def bark(): Unit = { println("Yip!") }
}

Full lesson:

You've seen that a child class inherits the parent's methods. Overriding is what happens when the child wants to change one of those inherited methods.

Why override?

Subclasses are usually special cases of the parent. A Puppy is a Dog, but it sounds different — "Yip!" instead of "Woof!". Instead of inventing a new method name, you redefine bark() on the Puppy. Callers don't need to know which subclass they're holding — they just call bark() and the right version runs.

How it works in Scala

• Every method can be overridden by default, unless it is marked final. The parent needs no special keyword.
• The child must mark its replacement with the override keyword. Leaving it out is a compile error.

Your task

The Dog class already defines bark. Inside the Puppy subclass, override bark with override def so it prints "Yip! I am " followed by the puppy's name. The harness creates a Puppy named "Buddy" and calls bark() on it.

Expected output:

Yip! I am Buddy