Q #3) Can we define a Parameterized Constructor in an Abstract class in Java?

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Q #1) Can Constructors be Private?

Answer: Yes. Constructors in Java can be private. All classes including abstract classes can have private constructors. Using private constructors we can prevent the class from being instantiated or we can limit the number of objects of that class.

Q #2) What is the use of Abstract Class Constructor in Java?

Answer: An abstract class constructor is invoked when we create an object of the derived class that inherits the abstract class. Besides if the abstract class has some member variables, we can initialize them in the abstract class constructor.

Q #3) Can we define a Parameterized Constructor in an Abstract class in Java?

Answer: Yes, we can have a parameterized constructor in an abstract class. Then we can call this constructor from the derived class that inherited the abstract class using super () call.

Q #4) Do you know why there is no Destructor in Java?

Answer: Java need not have a specific destructor as it has its garbage collector. This garbage collector destroys the objects that are unreachable and releases the memory. A method named finalize is also a part of the garbage collector that executes non-deterministically and performs the function of destructor like freeing the resources etc.

Q #5) Can Abstract Class have a body?

Answer: No. An abstract class can only have method declarations and constructors. Its methods are not implemented. The class that inherits this abstract class implements the methods. Apart from prototype or declarations, it can also have visibility or access specifiers.

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