[PDF] abstract class vs interface javarevisited

1) Interface in Java can only contains declaration. You can not declare any concrete methods inside interface. On the other hand abstract class may contain both abstract and concrete methods, which makes abstract class an ideal place to provide common or default functionality.
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  • What is the difference between an abstract class and an interface?

    In summary, abstract classes are used to provide a base class for concrete subclasses to inherit from, while interfaces are used to define a set of methods that a class must implement. Abstract classes can have implemented and abstract methods, while interfaces can only have abstract methods.5 avr. 2023

  • What is difference between interface and abstract class in Java?

    Interface: Explore the Difference between Abstract Class and Interface in Java. The Abstract class and Interface both are used to have abstraction. An abstract class contains an abstract keyword on the declaration whereas an Interface is a sketch that is used to implement a class.

  • Why use abstract class instead of interface?

    Abstract classes provide you the flexibility to have certain concrete methods and some other methods that the derived classes should implement. By contrast, if you use interfaces, you would need to implement all the methods in the class that extends the interface.
  • As a general rule, you should use an abstract class when creating a base class that needs to be inherited by other classes in a class hierarchy. If you need to define a behavior that can be implemented by multiple unrelated classes, you should use an interface.
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