[PDF] a subclass of a non abstract superclass can be abstract

A subclass of a non-abstract superclass can be abstract. (d) A subclass can override a concrete method in a superclass to define it as abstract. (e) An abstract  Questions d'autres utilisateurs
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  • Can a subclass of a non-abstract superclass be abstract?

    A subclass of a non-abstract superclass can be abstract. A subclass can override a concrete method in a superclass to define it as abstract. An abstract method cannot be static.

  • Can a subclass of a non-abstract superclass be abstract * True False?

    An abstract class can be used just like a non-abstract class except that you cannot use the new operator to create an instance from the abstract class. An abstract class can be extended. A subclass of a non-abstract superclass cannot be abstract.

  • Can a subclass of an abstract class be abstract?

    Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, then the subclass must also be declared abstract .
  • No you cannot add abstract method to non-abstract class. The reason is , when we have an abstract method, we need a subclass to provide the implementation for the abstract method. Hence the abstract class will always be extended by the sub-class.
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