To use polymorphism, the classes must be in a different hierarchy.
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Q18: Why does using the protected access modifier
Q19: Typically, an abstract class is a class
Q20: Several classes implement an interface, but all
Q21: The following code will run without errors:
//
Q22: Which of the following is true of
Q24: Which of the following cannot be an
Q25: An interface can contain one or more
Q26: Which Java keyword do we use in
Q27: Which of the following is correct regarding
Q28: An abstract method:
A) has a "do-nothing" body.
B)
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