Enthuware

I would have thought the answer is "TestClass.java will not compile", because TestClass.java is in a different package than Donkey.java.

Therefore "System.out.println(m.location)" in TestClass.java causes a compilation error.

TesClass has appropriate imports.

TestClass has correct imports, but the member variable "location" hasa default access modifier, so "m.location" in TestClass is an error?

Gotcha
m.location does not have default access modifier. Observe that the type of m is Movable. Not Donkey. Accessibility check is done by the compiler based on the type of the variable and not on the type of object referred to by the variable.

Ah, I see! Gotcha

Hi!

Interface fields are static final so can they be shadowed or they are inherited? Because if they are inherited then my doubt it's why don't throw a error when Donkey is instantiated since location got a new value?

Thanks!

Inheritance applies to instance members only.

The question should probably mention something along the lines of "assume the files are placed in the right directory structure and are compiled using the appropriate classpath", otherwise both Donkey.java and TestClass.java will not compile.

scranen wrote:The question should probably mention something along the lines of "assume the files are placed in the right directory structure and are compiled using the appropriate classpath", otherwise both Donkey.java and TestClass.java will not compile.

Anything that is not specified in the question should be assumed to be in order. This practice is followed by the real exam as well.
You cannot expect every question to specify that jdk is installed and javac is in path, can you?

int location = 0 in the interface is final. Not possible to change the value. In the class Donkey there is a value change with int location = 200. Is this ok because the variable location is declared in class Donkey and had no relation with the interface?

Yes, it is ok. You might want to try compiling and running it.

It would be good to add "public" into the second sentence. And m.moveBank(20) should be m.moveBack(20)


P.S. By the way, it is a very good question

Fixed.
thank you for your feedback!