Can i have constructor in abstract class in java

You can either explicitly provide a constructor to the abstract class or if you don't, the compiler will add a default constructor of no argument in the abstract class. This is true for all classes and it also applies to an abstract class. For those who want to recall what is an abstract class in Java, it's a class that can not be instantiated with the new operator or any other way. In order to use an abstract class in Java, You need to extend it and provide a concrete class. An abstract class is commonly used to define a base class for a type hierarchy with default implementation, which is applicable to all child classes.

By the way, the difference between interface and abstract class in Java is also one of the popular and tricky Java questions and should be prepared well for Java interviews.

Can we declare constructor on abstract class in Java is a follow-up of other similar Java interview questions e. Can we override static method in Java?. Why does the interviewer ask these questions? Mainly because, trying to confuse programmer with the fact that since an abstract class can not be instantiated, why abstract class needs a constructor.

Conclusion In this article, we learned. What is the purpose of the constructor inside an abstract class? What is constructor chaining? How to utilize constructors of abstract classes. With that being said, I wish you all the very best. Code with clear knowledge. Basic has to be strong to become efficient in coding.

And as always, Happy Coding! Wish to connect? View All. Rikam Palkar Updated date Jun 20, Ever heard about Constructor chaining. Constructor Chaining is a concept when a constructor calls another constructor in the same class or its base class. The derived class: MacBook. Now if I create an object of MacBook.

Let us execute this in the Main method. Twitter LinkedIn GitHub. C object-oriented programming OOPS. Next Recommended Reading. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. Properties of an abstract class: An abstract can have an abstract and a non-abstract method. It must be declared with an abstract keyword. It can have a constructor, static method.

We can define an abstract method inside the derived class of its abstract class. Skip to content. Change Language. Related Articles. Table of Contents. Save Article.