Write the declaration for class B. The classs members 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 extend class B or are in the same

package as class B.

setM, getM, setN, and getN. These are the mutator and 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.

Next, write the declaration for class D, which extends class B. The classs members should be 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, and getR. These are the mutator and 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 superclasss abstract calc method. This method should return

the value of q times r.

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