A exam sub. Can you help me?

[ge yinglong]

Hi,my friend
Is it right?

70．Which two demonstrate an �is a � relationship?(choose two.)again 2
A.public interface Person {}
public class Employee extends Person{}
B.public interface Shape {}
public interface Rectangle extends shape{}
C.public interface Color {}
public class Shape { private Color color; }
D.public class Species {}
public class Animal { private Species species; }
E.interface Component {}
class container implements Component {
private Component[] children;
}
answer: A, D
[e-mail]

[Jamal Hasanov]

Answers are : B and E
Explanation:
A. public interface Person {}
public class Employee extends Person{}
FALSE - wrong declaration - class can implement interface, not extend
B. public interface Shape {}
public interface Rectangle extends shape{}
TRUE - Rectangle is a Shape
C. public interface Color {}
public class Shape { private Color color; }
FALSE - sample of "has a" relationship - "Shape has a Color"
D. public class Species {}
public class Animal { private Species species; }
FALSE - sample of "has a" relationship - "Animal has a Species"
E. interface Component {}
class container implements Component {
private Component[] children;
}
TRUE - Container is a Component.
BTW, there's a "has a" relationship,too - "Container has a Component"
I can suggest you RHE preparation book for this topic.
Jamal Hasanov
www.j-think.com

[Jessica Sant]

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[ge yinglong]

Thanks a lot.