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Java Inheritance Rules

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Questions and Answers

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?

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?

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?

Method overriding Signup and view all the answers

What is the main goal of using access modifiers (private, default, protected, public) in object-oriented programming?

To restrict access to certain methods or variables. Signup and view all the answers

What is the primary benefit of specifying a concrete type when creating an ArrayList?

To reduce the risk of ClassCastException Signup and view all the answers

What is the purpose of specifying a concrete type when creating an ArrayList, in terms of type safety?

To enforce type safety at compile time Signup and view all the answers

What is an implication of not specifying a concrete type when creating an ArrayList?

The ArrayList can store objects of any type Signup and view all the answers

What is the effect of assigning the reference of an ArrayList to a variable?

It assigns the reference to the variable Signup and view all the answers

What is the purpose of using generic types in creating an ArrayList?

To reduce the risk of runtime errors Signup and view all the answers