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Consider classes A, B and C, where A is an abstract superclass, в is a concrete class that inherits from A and c is a concrete class that inherits from B. Class A declares abstract met hod original Method, implemented in class B. Which of the following statements is true of class c?

Consider classes A, B and C, where A is an abstract superclass, в is a concrete class that inherits from A and c is a concrete class that inherits from B. Class A declares abstract met hod original Method, implemented in class B. Which of the following statements is true of class c?

Computer Networking: A Top-Down Approach (7th Edition)
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
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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5. Consider classes A, B and C, where A is an abstract superclass, B is a concrete class that inherits from A and C is a concrete class that inherits from B. Class A declares abstract met hod original Method, implemented in class B. Which of the following statements is true of class c? a. Method original Method cannot be overridden in class c-once it has been implemented in concrete class B, it is implicitly final. b. Method original Method must be overridden in class c, or a syntax error will occur. c. If method original Method is not overridden in class c but is called by an object of class c, an error occurs. d. None of the above. Consider the abstract superclass below: public abstract class Foo { private int a; public int b; public Foo(int aVal, int bVal ) { a = aval: b = bVal; } // end Foo constructor public abstract int calculate(); } // end class Foo Any concrete subclass that extends class Foo: a. Must implement a method called calculate. b. Will not be able to access the instance variable a. c. Will not be able to instantiate an object of class Foo. d. All of the above. 6.
Transcribed Image Text:5. Consider classes A, B and C, where A is an abstract superclass, B is a concrete class that inherits from A and C is a concrete class that inherits from B. Class A declares abstract met hod original Method, implemented in class B. Which of the following statements is true of class c? a. Method original Method cannot be overridden in class c-once it has been implemented in concrete class B, it is implicitly final. b. Method original Method must be overridden in class c, or a syntax error will occur. c. If method original Method is not overridden in class c but is called by an object of class c, an error occurs. d. None of the above. Consider the abstract superclass below: public abstract class Foo { private int a; public int b; public Foo(int aVal, int bVal ) { a = aval: b = bVal; } // end Foo constructor public abstract int calculate(); } // end class Foo Any concrete subclass that extends class Foo: a. Must implement a method called calculate. b. Will not be able to access the instance variable a. c. Will not be able to instantiate an object of class Foo. d. All of the above. 6.
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