What is an abstract class, and why might it be useful in an inheritance hierarchy?
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Q19: When a variable is declared in a
Q20: Java supports multiple inheritance.
Q21: What is a shadow variable?
Q22: What does it mean for a class
Q23: Explain what it means for a child
Q25: Inheritance should not be considered in the
Q26: Explain how a subclass can can access
Q27: An abstract class must contain abstract methods.
Q28: Explain the relevance of the Object class
Q29: It is possible to derive a class
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