Given:
Which three statements concerning the OO concepts “is-a” and “has-a” are true?
A.
Flimmer is-a Plinkable
B.
Flommer has-a Tagget
C.
Flommer is-a Glommer
D.
Tagget has-a String
E.
Flommer is-a Plinkable
F.
Flimmer is-a Flommer
G.
Tagget is-a Plinkable
Explanation:
A: Flimmer implements Plinkable.
Flimmer is-a plinkable.
D:The relationship modeled by composition is often referred to as the “has-a” relationship.
HereTaggethasaString.
F: Flommer extends Flimmer
So there is an “is-a relationship between Flommer and Flimmer .
Note: Thehas-a relationship has anencapsulation feature (like private or protected modifier used
before eachmember field or method).
Answer is A,D,E
No, it is ABE. Current answer is correct.
why answer is ABE
Tagget doesn’t have-a String. There’s only a String object in the body of a method. It’s not a field.
Answer is only A & D
B is incorrect. Flommer has list of Tagget.
A
D
F
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A,B,E
A,B,E
B. Flommer has-a Tagget:
OCA/OCP Java SE 7 Programmer I & II Study Guide (Kathy Sierra, Bert Bates)
93 Inheritance and Polymorphism (OCA Objectives 7.1, 7.2, and 7.3)
Class A HAS-A B if code in class A has a REFERENCE to an instance of class B.
A. True : Flimmer implements Plinkable -> Flimmer is-a plinkable
E. True : Flommer extends Flimmer and Flimmer implements Plinkable -> Flommer is-a Plinkable