h (if any) of the following conditions are necessary for using polymorphism? Select all correct answers. The classes involved are in the same hierarchy. None of the classes can be abstract. All of the subclasses involved override the same method. The object reference cannot be of an interface type. An object reference of the superclass is used to call any methods. A superclass object
Which (if any) of the following conditions are necessary for using polymorphism? Select all correct answers.
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The classes involved are in the same hierarchy. |
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None of the classes can be abstract. |
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All of the subclasses involved override the same method. |
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The object reference cannot be of an interface type. |
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An object reference of the superclass is used to call any methods. |
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A superclass object is referenced by a subclass reference. |
Which of the following (if any) are true of abstract methods? Select all correct answers.
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Abstract methods must have a method body. | |
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Abstract methods cannot be declared in a class that isn't abstract itself. |
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Abstract methods cannot be private or static. |
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Abstract methods can only be declared in an interface. |
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Abstract methods cannot be called. |
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Constructor methods can be abstract. |
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