1z0-819 Exam - Question 97

Question

Given:Which three classes successfully override showFirst()? (Choose three. ).

Examice · Accepted Answer

To successfully override the showFirst() method from the AdaptorFirst interface, the method must match the signature provided in the interface, which includes the method name and return type. Option A provides a concrete implementation of the showFirst() method, matching the signature. Option B, although abstract, correctly declares the showFirst() method, requiring any concrete subclass to implement it. Option E also provides a concrete implementation matching the interface's method signature. Therefore, options A, B, and E are correct answers.

Stavok · Answer

The three classes that successfully override the showFirst() method are A, B, and E.

Option A is correct because it provides a concrete implementation of the showFirst() method as required by the AdaptorFirst interface.

Option B is correct because it declares the showFirst() method as abstract, which means that any concrete subclass of MainClass must provide an implementation of the showFirst() method.
Option E is correct because it provides a concrete implementation of the showFirst() method as required by the AdaptorFirst interface.

ASPushkin · Answer

Implementation and overriding are not the same thing.
overriding (redefining the behavior of a method) and implementing (satisfying specific type constraints of a method)
In fact, only case A is the overriding.
--------
C Failed
Failed
it will not work for "void"
it will work if
interface AdapterFirst {
   Object showFirst();
}
-------
B,E - ok
it is possible to mark the class without an abstract methods as abstract
-------
F   Failed
method overriding access must not make more restrictive (can be less restrictive)

1z0-819 Exam - Question 97

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