Differences between Any, Unit and Nothing

Differences between Any, Unit and Nothing

Any

• 
  Any is by default the superclass of all the classes and has 3 functions: equals, hashCode and toString. This is equal to Object class in Java.
• We can create an object of Any class directly or even override these functions in any other class.

Unit

• Unit class is a singleton class, we can’t extend or even create an object of it.
• Unit class in equal to void type in Java.
• The superclass of Unit is Any and it has overridden toString method.

Nothing

• Nothing is non-open (final class) which can’t be extended and its constructor is also private that means we can’t create the object also.
• This is usually used to represent the return type of function which will always throw an exception.
• The superclass of Nothing is Any.