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Questions and Answers
What is a key constraint on a subclass when overriding a protected method from its superclass?
What is a key constraint on a subclass when overriding a protected method from its superclass?
- The subclass must weaken the accessibility of the method.
- The subclass cannot change the accessibility of the method.
- The subclass can strengthen the accessibility of the method. (correct)
- The subclass must keep the same accessibility of the method.
Which of the following is a possible outcome when a subclass overrides a method from its superclass?
Which of the following is a possible outcome when a subclass overrides a method from its superclass?
- The subclass must have the same method signature and accessibility. (correct)
- The subclass can only narrow the accessibility of the method.
- The subclass must have a different method signature.
- The subclass can change the method's return type.
What happens when a subclass overrides a protected method from its superclass and changes its visibility to public?
What happens when a subclass overrides a protected method from its superclass and changes its visibility to public?
- The subclass is strengthening the accessibility of the method. (correct)
- The subclass is hiding the method from the superclass.
- The subclass is weakening the accessibility of the method.
- The subclass is keeping the same accessibility of the method.
What is the term for when a subclass provides a different implementation of a method that is already defined in its superclass?
What is the term for when a subclass provides a different implementation of a method that is already defined in its superclass?
What is the main goal of using access modifiers (private, default, protected, public) in object-oriented programming?
What is the main goal of using access modifiers (private, default, protected, public) in object-oriented programming?
What is the primary benefit of specifying a concrete type when creating an ArrayList?
What is the primary benefit of specifying a concrete type when creating an ArrayList?
What is the purpose of specifying a concrete type when creating an ArrayList, in terms of type safety?
What is the purpose of specifying a concrete type when creating an ArrayList, in terms of type safety?
What is an implication of not specifying a concrete type when creating an ArrayList?
What is an implication of not specifying a concrete type when creating an ArrayList?
What is the effect of assigning the reference of an ArrayList to a variable?
What is the effect of assigning the reference of an ArrayList to a variable?
What is the purpose of using generic types in creating an ArrayList?
What is the purpose of using generic types in creating an ArrayList?
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