Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have default no-argument constructors: abstract class A() class B extends A () Which of the following is correct? O Aa= new A(): O Aa = new B(): Bb= new A(): Ba= new A(O:

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have default no-argument constructors:
abstract class A 0
class B extends ÃO
Which of the following is correct?
O Aa- new A();
Aa = new B():
Bb= new A(O:
Ba= new A();
Transcribed Image Text:Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have default no-argument constructors: abstract class A 0 class B extends ÃO Which of the following is correct? O Aa- new A(); Aa = new B(): Bb= new A(O: Ba= new A();
Which of the following statements regarding abstract classes is true?
An abstract class can have instances created using the constructor of the abstract class.
O An abstract class can be extended.
A subclass of a non-abstract superclass cannot be abstract.
An abstract class cannot be used as a data type.
Transcribed Image Text:Which of the following statements regarding abstract classes is true? An abstract class can have instances created using the constructor of the abstract class. O An abstract class can be extended. A subclass of a non-abstract superclass cannot be abstract. An abstract class cannot be used as a data type.
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