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October 7, at am. October 7, at pm. Your question boils down to this: Should abstract class A be of type I which is the interface. As an example: If any implementation of some abstract class should be closeable, it should implement java. Otherwise it should not. Add a comment. Active Oldest Votes. You either implement them in the abstract class or you leave them abstract , but then some of your more concrete children need to implement it. Improve this answer.
Zabuzard Zabuzard Do you know by chance if this same rule applies for C? Azazel I am not a C developer but the languages are very similar. That said, which particular rule are you talking about - the answer covers a lot of aspects. In Java, a class can only inherit from one class, but can implements multiple interfaces. Kerry Gougeon Kerry Gougeon 1, 9 9 silver badges 17 17 bronze badges. Niraj Kulal Niraj Kulal 89 1 1 silver badge 5 5 bronze badges.
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Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Related All the methods of an interface are abstract methods. An interface cannot be instantiated. However, classes that implement interfaces can be instantiated. Interfaces never contain instance variables but, they can contain public static final variables i.
A class which has the abstract keyword in its declaration is called abstract class. Abstract classes should have at least one abstract method.
It can have multiple concrete methods. Abstract classes allow you to create blueprints for concrete classes. But the inheriting class should implement the abstract method. An abstract class permits you to make functionality that subclasses can implement or override whereas an interface only permits you to state functionality but not to implement it.
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