question about Dan's mock exam (interfaces)

[Andres Gonzalez]

taken from Dans Exam

interface Z {void m1();}  // 1
class D implements Z {public final void m1() {}} // 2
class E implements Z {public synchronized void m1() {}} // 3
class F implements Z {public strictfp void m1() {}} // 4
class G implements Z {public native void m1();} // 5

Compile-time errors are generated at which lines?
a. 1
b. 2
c. 3
d. 4
e. 5
f. None of the above.
I selected E, because that method (public native void m1();) is not implementing anything (notice it doesn't have curly brackets).It should be declared abstract and so the class.
all other methods have implementations (even though they only have {} ).
But Dan's answer is F (none of the above).

[Ryan Wilson]

native methods are like abstract (they end in ; without any {})
public native void m1();
Native uses platform specific language, therefore the code cannot be implemented in the Java method.
The code that native implements is loaded from a library somewhere on the system.

[Robbie kyodo]

hey
interface can't be final .

[Thomas Paul]

Originally posted by Robbie kyodo:
interface can't be final .

But there is no final interface in the question.