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Implement Interface using Abstract Class in Java

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Interface contains only abstract methods that can't be instantiated and it is declared by keyword interface. A class that is declared with t ...read more

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Are All Methods in a Java Interface are Abstract?

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Constructor in Java Abstract Class

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Constructor is always called by its class name in a class itself. A constructor is used to initialize an object not to build the object. As ...read more

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Can We Instantiate an Abstract Class in Java?

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Abstract class, we have heard that abstract class are classes which can have abstract methods and it can't be instantiated. We cannot instan ...read more

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Why Java Interfaces Cannot Have Constructor But Abstract Classes Can Have?

Last Updated: 29 August 2021

Prerequisite: Interface and Abstract class in Java.A Constructor is a special member function used to initialize the newly created object. I ...read more

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Abstract Class: An abstract class is a type of class in Java that is declared by the abstract keyword. An abstract class cannot be instantia ...read more

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Java | Abstract Class and Interface | Question 3

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Predict the output of the following program.[sourcecode language="Java"]abstract class demo{ public int a; demo() { a = 10; ...read more

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Java | Abstract Class and Interface | Question 2

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Which of the following is true about interfaces in java.1) An interface can contain following type of members.....public, static, final fiel ...read more

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Java | Abstract Class and Interface | Question 1

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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 metho ...read more

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Abstract Class in Java

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In Java, abstract class is declared with the abstract keyword. It may have both abstract and non-abstract methods(methods with bodies). An a...read more

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