[PDF] abstract class vs interface in java

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. A class can extend only one abstract class while a class can implement multiple interfaces.
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  • What is the 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.

  • When should you use abstract class vs interface Java?

    Interfaces are also good when we want to have something similar to multiple inheritances since we can implement multiple interfaces. If we are designing small, concise bits of functionality, use interfaces. If we are designing large functional units, use an abstract class.

  • Which is better abstract class or interface?

    You should use an interface if you want a contract on some behavior or functionality. You should not use an interface if you need to write the same code for the interface methods. In this case, you should use an abstract class, define the method once, and reuse it as needed.
  • The differences it highlights are the accessibility of data members and methods: abstract classes allow non-static and non-final fields and allow methods to be public, private, or protected while interfaces' fields are inherently public, static, and final, and all interface methods are inherently public.
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