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  • INTERVIEW QUESTIONS J2EE CORE JAVA DETAILS
    Question :
    What is similarities between an Abstract class and Interface?
    Category Core Java Interview Questions
    Rating (0.4) By 2132 users
    Added on 8/24/2009
    Views 1720
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    Answers:

    Neither Abstract classes or Interface can be instantiated.



    We can't create a object of both Interface and Abstract class.
    We create object of the class who inherit either abstract class of interface.



    Posted by: Ajay Kumar Sharma    

    Contact Ajay Kumar Sharma Contact Ajay Kumar Sharma

    abstract methods are contained in both interface and abstract classes.
    Neither abstract classes nor interface can be instantiated
    and
    we create object for the class which implements abstract class or interface



    Posted by: Efzel    

    Contact Efzel Contact Efzel

    In java abstract class can have abstract methods and non abstract methods.But if we have atleast one abstract method in a class then the compiler will force the user to make the class as abstract. We can just make an class having all concrete methods as abstract also ( kind of privacy setting ) so no one will instantiate an object of that class. An interface in java is like a contract between the interface and the class which implements it . In an interface all the methods are public abstract and all the variable are public static final . An interface can never have a concrete method. An interface basically acts as a design pattern also ( like factory design pattern) best example is the JDBC api's Connection , statement , resultset all are interfaces so decoupled architecture is created and helps the application to be saclable and maintainable.



    Posted by: Mahanth Hiremath    

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