that is nothing but access specifiers only

public
private
default
and one im not getting

public
private
protected
default

public accsess specifier means it can publically accessed 
by the class whether it's subclass of that class or present 
in same packege or diffrent classes.

private access specifier is private to that class i.e. it 
cant access out side the class

procted -it's accesesed by the sub class of the ckass 
whether that present in the sane package or diffrent but it 
must be a subclass

noacces accessed with in the same package

i feel with interface we can use public and default.and 
with abstract we can use all except private

This question leads to two things 
1. modifier for abstract class or interface
2. modifier for members of abstarct class or interface

For first in abstract class and interface we can have 
public , protected and default and not private if it is top 
level otherwise private also if it is nested

for point 2 
in an interface every member variable is public and final
in an abstract class you can assign any modifier to member 
variables

I guess if members of interface are declared final then 
they can't be overridden & hence this hampers the logic 
behind having interfaces...

Interface can only be Public/Default or abstract.In any 
other case it can't be overridden & hence of no use.

MemberFunctions also behave similarly.

Interface: Public or default
Abstract Class (Anything ) : public , private or Default


Iam sure about these answears
-uday