Object Object Object
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The object keyword in Kotlin defines something like class. But you cannot create instance of an object, as there is only one. Remember [Singleton pattern][singleton].
#kotlin
62 posts · page 3 of 8
Nested class
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A nested class enables us to group more logically, hence it makes it more readable and refined structure. A nested class is simply a class within the namespace of outer class.
Sealed class in Kotlin
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To constrain a class hierarchy, we have to declare the superclass sealed. Without the constraint, our code will look like this:
Downcasting
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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 the derived class. Every base class member…
Another choice for middle ground (Composition Vs Inheritance)
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Both composition and inheritance place sub objects inside the new class. With composition, the sub object is explicit whereas the sub object with inheritance is implicit.
Another look in Inheritance
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We touched a bit on Inheritance concept. Inheritance is sometimes used to add functions to a class as a way of reuse for a new purpose.
Composition
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One of most compelling arguments for object oriented programming is code reuse.
Polymorphism
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One of the Object Oriented Programming concept is the ability of polymorphism. The word, polymorphism is an ancient Greek term. It means many forms. In programming context, polymorphism means an obje…