Why does it compile when casting to an unrelated interface? [duplicate]

by

The compiler does not know that this won’t work: You could have a subclass of BlackInk that implements Printable. Then the cast would be fine.

In situations where the compiler knows it won’t work, you will get an error.

For example, if you make BlackInk final (so that there can be no subclasses) you get an error.

More Related Contents:

  1. my app keeps stopping in android emulator [closed]
  2. Type List vs type ArrayList in Java [duplicate]
  3. Java Pass Method as Parameter
  4. How do you find all subclasses of a given class in Java?
  5. Custom fonts and XML layouts (Android)
  6. Find Java classes implementing an interface [duplicate]
  7. Why would a static nested interface be used in Java?
  8. Polymorphism: Why use “List list = new ArrayList” instead of “ArrayList list = new ArrayList”? [duplicate]
  9. Abstract class vs Interface in Java
  10. Protected in Interfaces
  11. Should we @Override an interface’s method implementation?
  12. Java – declaring from Interface type instead of Class
  13. When should I use an interface in java? [closed]
  14. List versus ArrayList as reference type?
  15. Why an abstract class implementing an interface can miss the declaration/implementation of one of the interface’s methods?
  16. Why are class static methods inherited but not interface static methods?
  17. Do/can abstract classes replace interfaces? [duplicate]
  18. Generics, arrays, and the ClassCastException
  19. NotSerializableException on anonymous class
  20. Java generics – Make Generic to extends 2 interfaces
  21. Should you always Code To Interfaces In Java [closed]
  22. Getting class cast exception where both classes are exactly the same
  23. Why would both a parent and child class implement the same interface?
  24. Are defaults in JDK 8 a form of multiple inheritance in Java?
  25. interface as a method parameter in Java
  26. static initialization in interface
  27. Lambda implementation of interface in kotlin
  28. How much interfaces a class file can implement [closed]
  29. what is the actual use of interface in java? [duplicate]
  30. This appears to create an object from an interface; how does it work?

Leave a Comment