Java Tutorial 20.02: Static member classes
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If class Test extends Top.Nest1, does it also inherit all of class Top members?
I'm looking at the line "int x = (new Top()).j;", and I have trouble understanding it, the only explanation would be that the it does inherit all of the above.
I ask this because "j" is marked as private in class Top, and it is being accessed from outside the Top class.
Thank you!
liva236 1 year ago
You're right both tp.j and (new Top()).j will fail - I'm trying to show too much on one diagram. If j wasn't private it would work. I made it private so I could show access to private fields in Nest1.
Zantorc 1 year ago
Thank you!
So, the conclusion would be that when class Test extends Top.Nest1, it doesn't inherit all of class Top members, only Nest1's?
liva236 1 year ago
Yes. When you're in a class there are 2 direction you can go to look for a member. Up through the inheritance tree or outwards through enclosing classes. (You can't go up a bit and then out).
Originally I had static int k; in Top, but I took it out so I could put in more text and changed k in Test to be j :-( The thing I really wanted to show in Test, was the use of a null reference to get a static field doesn't give a null pointer exception - that's surprising.
Zantorc 1 year ago