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Question about jsp:useBean

 
Botez Nicolae
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I am preapring for web component certification and I have a question from a mock exam which confused me. This is the question with the answer:


Given:
<jsp:useBean id="baz" class="com.test.Test" type="com.test.Bar" />

Which two are true? (Choose two)

A. An object of type com.test.Test is instantiated and assigned to a variable baz of type com.test.Bar.
B. An object of type com.test.Bar is instantiated and assigned to a variable baz of type com.test.Test.
C. To avoid error, com.test.Bar must be superclass of com.test.Test or an interface implemented by com.test.Test.
D. To avoid error, com.test.Test must be a superclass of com.test.Bar or an interface implemented by com.test.Bar.

Answer: B, D

In my opinion the correct answers are A and C not B, D as it is written in the mock exam. Am I right ? Please help me!
 
Ashwin Sridhar
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Flex Oracle Spring
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Yes you are right. Correct answer is A,C.
We try to create object for the Test Class and reference it to Bar class/interface variable baz. OO Concept - Dynamic Polymorphism.
So, Bar can be either abstract class which is extended by Test Class or Interface implemented by Test Class or simply any class or interface higher up in the inheritance hierachy of Test Class.
 
Botez Nicolae
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Thanks a lot!
 
Avinash Ga
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Eclipse IDE Java Spring
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Yes nicolae, you are right. The correct answers are A and C. Some times authors will make mistakes and some times that is intentional it seems, don't get confused and stick to your basics.
 
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