Why an abstract class implementing an interface can miss the declaration/implementation of one of the interface’s methods?

by

That’s because if a class is abstract, then by definition you are required to create subclasses of it to instantiate. The subclasses will be required (by the compiler) to implement any interface methods that the abstract class left out.

Following your example code, try making a subclass of AbstractThing without implementing the m2 method and see what errors the compiler gives you. It will force you to implement this method.

More Related Contents:

  1. When to use: Java 8+ interface default method, vs. abstract method
  2. Abstract class in Java
  3. When to use abstract class or interface? [closed]
  4. Abstract class vs Interface in Java
  5. How should I have explained the difference between an Interface and an Abstract class?
  6. What are the differences between abstract classes and interfaces in Java 8?
  7. Use of Java [Interfaces / Abstract classes] [duplicate]
  8. not implementing all of the methods of interface. is it possible?
  9. Do/can abstract classes replace interfaces? [duplicate]
  10. When do I have to use interfaces instead of abstract classes? [duplicate]
  11. what is the actual use of interface in java? [duplicate]
  12. Type List vs type ArrayList in Java [duplicate]
  13. Java Pass Method as Parameter
  14. Can an abstract class have a constructor?
  15. Custom fonts and XML layouts (Android)
  16. What is the use of interface constants?
  17. Why would a static nested interface be used in Java?
  18. Polymorphism: Why use “List list = new ArrayList” instead of “ArrayList list = new ArrayList”? [duplicate]
  19. Java – declaring from Interface type instead of Class
  20. List versus ArrayList as reference type?
  21. How to unit test abstract classes: extend with stubs?
  22. How to create an instance of anonymous class of abstract class in Kotlin?
  23. NotSerializableException on anonymous class
  24. Call method not defined in interface from implemented interface in Java
  25. Why would both a parent and child class implement the same interface?
  26. Can an interface method have a body?
  27. static initialization in interface
  28. What is a static interface in java?
  29. Does invoking a constructor mean creating object?
  30. Using Gson and Abstract Classes

Leave a Comment