In Java   Demonstrate proper use of access modifiers with instance variables and methods in classes

Can abstract classes also contain abstract properties?

In order to qualify as a subclass of an abstract class, a class must offer concrete implementations for all of the abstract methods defined in the abstract parent class. Exactly how do you feel about this?

A subclass of an abstract class must provide concrete implementations for each of the parent class's abstract methods in order to be considered a subclass. What are your thoughts on this?

What is the role of abstract classes and interfaces in achieving polymorphism?

The main differences between method overloading and method overriding should be clarified.

In java, can a polymorphic reference invoke a method that is only declared at the object's class level? If "yes", explain how.

Write the definition of classes and interfaces in the given diagram using following details: a) Interface shape has a method draw(). b) Override the method draw() in all subclasses. c) Define a non-abstract method fillColor() in Circle class. (I want the complete solution using the codes in bluej program also diagram) bluej java cood

State a circumstance in which you would prefer an interface over an abstract class. Also, State a circumstance in which you would prefer an abstract class over an interface.

Laguage: C++   Explain youre answer. True or False? - For class inheritance, field initializer is just an efficient opinion for the constructor of the derived class, but we dont necessarily need it.