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Creating References Using Inheritance Hierarchies

AP Computer Science A· difficulty 4/5

Continuing: <code>obj.someBMethod()</code> where someBMethod is only in B

  • A

    Returns null

  • B

    Compile error (reference type is A; method not in A)

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  • C

    Throws exception

  • D

    Works at runtime

Explanation

Compile-time check uses reference type A; B-only method not visible.

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