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The private methods of a class in Java are visible to its subclasses.? What implementation of...

The private methods of a class in Java are visible to its subclasses.?

What implementation of Set would you use to get the objects in the order they were inserted?

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Answer #1

Answer 1 :

There are 3 access modifiers in Object-Oriented Programming :

1. Private: Private methods and variables can only be used by the members which are present within the class and cannot be inherited.

2. Protected: Protected methods and variables can be used by members within the class and by the members of the subclass. Hence, Can be inherited.

3. Public: Methods and data members that are declared public can be accessed from anywhere.

So, to answer the question,

No, the private methods of a class in Java are not visible to its subclasses. To make it visible for the subclasses, the user needs to declare the method as 'Protected'.



Answer 2 : LinkedHashSet

The implementation needed for a Set is to add Hash Table and Linked List with predictable iteration order. A normal HashSet iterator is very random but with the help of a linked list, it solves the problem. The linked list defines the order of the iteration i.e. the order in which the elements were inserted to the set.

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