Question

20. An interface may extend an abstract class. True False 21. An abstract class may implement an interface. True False 22. Abstract methods may exist only in abstract classes but not in concrete classes or interfaces. True False 23. The constructor of an abstract class may only be called via super in a class that extends it. True False 24. If an abstract class implements an interface, then a subclass that extends the abstract class must override all abstract methods in the abstract class and interface. True

          20. An interface may extend an abstract class.
True
False
21. An abstract class may implement an interface.
True
False
22. Abstract methods may exist only in abstract classes but not in concrete classes or
interfaces.
True
False
23. The constructor of an abstract class may only be called via super in a class that
extends it.
True
False
24. If an abstract class implements an interface, then a subclass that extends the
abstract class must override all abstract methods in the abstract class and interface.
True

20. An interface may extend an abstract class.
True
False
21. An abstract class may implement an interface.
True
False
22. Abstract methods may exist only in abstract classes but not in concrete classes or
interfaces.
True
False
23. The constructor of an abstract class may only be called via super in a class that
extends it.
True
False
24. If an abstract class implements an interface, then a subclass that extends the
abstract class must override all abstract methods in the abstract class and interface.
True

Added by Tiffany L.

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