Matakuliah
Tahun
Versi
: M0074/PROGRAMMING II
: 2005
: 1/0
MATERI PENDUKUNG
CLASS ABSTRACT
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• An abstract class is a class that is
incomplete, or to be considered incomplete.
Only abstract classes may have abstract
methods, that is, methods that are declared
but not yet implemented. If a class that is not
abstract contains an abstract method, then a
compile-time error occurs. A class has
abstract methods if any of the following is
true:
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– It explicitly contains a declaration of
an abstract method.
– It inherits an abstract method from its
direct superclass.
– A direct superinterface of the class
declares or inherits a method (which
is therefore necessarily abstract) and
the class neither declares nor
inherits a method that implements it.
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