Zusammenfassung der Ressource
Frage 1
Frage
An abstract class is a superclass
Frage 2
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An abstract class can be instantiated
Frage 3
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Abstract methods are not implemented.
Frage 4
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A concrete class can contain abstract methods.
Frage 5
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An abstract class is declared with keyword abstract.
Frage 6
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A subclass will always be concrete even it if doesn't implement all of the abstract methods of its superclass.
Frage 7
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An abstract class can have instance variables.
Frage 8
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An abstract class can have no abstract methods.
Frage 9
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An abstract class cannot have concrete methods.