a) Write the declaration for class B. The members of the class should be as follows:m, an integer. This variable should not be accessible to code outside the class or to any class that extends class B.n, an integer. This variable should be accessible only to classes that extends class B or are in the same package as class B.setM, getM,setN, getN. These are the mutator aand accessor methods for the member variables m and n. These methods should be accessible to code outside the class.calc. This is a public abstract method.b) Write a declaration for class D, which extends class B. The members of the class are as follows:q, a double. This variable should not be accessible to code outside the class.r, a double. This variable should be accessible to any class that extends class D or is in the same package.setQ, getQ,setR, getR. These are the mutator aand accessor methods for the member variables q and r. These methods should be accessible to code outside the class.Calc, a public method that overrides the abstract method calc of the super. This value should return the value of q times r.

The objective of the question is to declare two classes B and D in Java. Class B has two integer…

Answered: a) Write the declaration for class B.…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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a) Write the declaration for class B. The members of the class should be as follows:

m, an integer. This variable should not be accessible to code outside the class or to any class that extends class B.
n, an integer. This variable should be accessible only to classes that extends class B or are in the same package as class B.
setM, getM,setN, getN. These are the mutator aand accessor methods for the member variables m and n. These methods should be accessible to code outside the class.
calc. This is a public abstract method.

b) Write a declaration for class D, which extends class B. The members of the class are as follows:

q, a double. This variable should not be accessible to code outside the class.
r, a double. This variable should be accessible to any class that extends class D or is in the same package.
setQ, getQ,setR, getR. These are the mutator aand accessor methods for the member variables q and r. These methods should be accessible to code outside the class.
Calc, a public method that overrides the abstract method calc of the super. This value should return the value of q times r.

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