Thread: Polymorphism and encapsulation questions (teaching myself OOP through reading about Java)

1. In Java, can you use polymorphism without the keyword extends?

2. In Java, is an encapsulated entity necessarily an object?

3. In Java can you use polymorphism with functions that require the same number of arguments?

4.a. Is it true that the three pillars of object-oriented programming are encapsulation, inheritance and polymorphism? 4.b. If so, how much overlap is there among these three concepts?
I don't think you could use polymorphism without inheritance. 4.c. Right?

5. If I have a class that includes a function and there is data manipulation with the function returning data, did I use encapsulation?

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