(a) abstract
This is the only modifier other than visibility modifiers, which can be used with interface.
Interfaces just specify the method prototypes and not any implementation: they are, by their nature, implicitly abstract (i.e. they cannot be instantiated). We can declare an interface as abstract but it is redundant as interface is always abstract.
This is the only modifier other than visibility modifiers, which can be used with interface.
Interfaces just specify the method prototypes and not any implementation: they are, by their nature, implicitly abstract (i.e. they cannot be instantiated). We can declare an interface as abstract but it is redundant as interface is always abstract.
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