Scala Final

Final is a keyword, which is used to prevent inheritance of super class members into derived class. You can declare final variables, methods and classes also.

Scala Final Variable Example

You can’t override final variables in subclass. Let’s see an example.

Output:

Error - value speed cannot override final member   

Scala Final Method

Final method declare in the parent class can’t be override. You can make any method to final if you don’t want to get it overridden. Attempt to override final method will cause to a compile time error.

Scala Final Method Example

Output:

method show cannot override final member      override def show(){                   ^  one error found  

Scala Final Class Example

You can also make final class. Final class can’t be inherited. If you make a class final, it can’t be extended further.

Output:

error: illegal inheritance from final class Vehicle  class Bike extends Vehicle{                     ^  one error found