If a class has an abstract method, then that class must be declared abstract.
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Q49: Protected fields and methods are inherited.
Q50: When calling the constructor of a superclass
Q51: Typically, an abstract class is a class
Q52: Usually, an abstract class contains at least
Q53: We can instantiate an object from an
Q55: Abstract methods can be called.
Q56: Inheritance helps organize related classes into _.
Q57: An abstract class is declared to be
Q58: The interface concept is Java's way of
Q59: Because the private instance variables of a
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