Abstract Class Program Questions In Java

It cannot be instantiated.

Abstract class program questions in java. Abstract method in java. A a new b. B b new a. Which of the following is correct.

Points to remember an abstract class must be declared with an abstract keyword. Which of the following is false about abstract classes in java a if we derive an abstract class and do not implement all the abstract methods then the derived class should also be marked as abstract using abstract keyword b abstract classes can have constructors c a class can be made abstract without any abstract method d a class can inherit from multiple abstract classes. It can have final methods which will force the subclass not to change the body of the method. If a regular class extends an abstract class then the class must have to implement all the abstract methods of that class or it has to be declared abstract as well.

It can have abstract and non abstract methods. Yes abstract class can declare and define constructor in java. Do take a look. Check out the example program to understand how abstraction is achieved using abstract classes and abstract methods.

Suppose a is an abstract class b is a concrete subclass of a and both a and b have a default constructor. Can abstract class have constructors in java. Since you can not create instance of abstract class constructor can only be called during constructor chaining ie. Solve question related to java abstract class.

When you create instance of concrete implementation class. A a new a.