Inner class
Inner class
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Object Object Object
What is object
Nested class
Nested Class
Sealed class in Kotlin
To constrain a class hierarchy, we have to declare the superclass sealed. Without the constraint, our code will look like this:
Downcasting
Downcasting is to discover the specific type of a previously upcast object. Upcast is always safe because the base class cannot have a bigger interface than ...
Another choice for middle ground (Composition Vs Inheritance)
Both composition and inheritance place sub objects inside the new class. With composition, the sub object is explicit whereas the sub object with inheritance...
Composition
One of most compelling arguments for object oriented programming is code reuse.