Defining Classes II - Absolute Java - page 341

5. Part One: Define a class named Money whose objects represent amounts of U.S.
money. The class should have two instance variables of type int for the dollars and
cents in the amount of money. Include a constructor with two parameters of type
int for the dollars and cents, one with one constructor of type int for an amount of
dollars with zero cents, and a no-argument constructor. Include the methods add and
minus for addition and subtraction of amounts of money. These methods should be
static methods, should each have two parameters of type Money , and return a value
of type Money . Include a reasonable set of accessor and mutator methods as well as
the methods equals and toString . Write a test program for your class.

Part Two: Add a second version of the methods for addition and subtraction.
These methods should have the same names as the static version but should use a
calling object and a single argument. For example, this version of the add method
(for addition) has a calling object and one argument. So m1.add(m2) returns the
result of adding the Money objects m1 and m2 . Note that your class should have all
these methods; for example, there should be two methods named add .

Alternate Part Two: Add a second version of the methods for addition and subtrac-
tion. These methods should have the same names as the static version but should
use a calling object and a single argument. The methods should be void methods.
The result should be given as the changed value of the calling object. For example,
this version of the add method (for addition) has a calling object and one argu-
ment. Therefore,

m1.add(m2);

changes the values of the instance variables of m1 so they represent the result of
adding m2 to the original version of m1 . Note that your class should have all these
methods; for example, there should be two methods named add .
(If you want to do both Part Two and Alternate Part Two, they must be two
classes. You cannot include the methods from both Part Two and Alternate Part
Two in a single class. Do you know why?)
6. Part One: Define a class for rational numbers. A rational number is a number that
can be represented as the quotient of two integers. For example, 1 > 2, 3 > 4, 64 > 2,

and so forth are all rational numbers. (By 1 2 and so forth, we mean the everyday

meaning of the fraction, not the integer division this expression would produce in
a Java program.) Represent rational numbers as two values of type int , one for
the numerator and one for the denominator. Your class should have two instance
variables of type int . Call the class Rational . Include a constructor with two
arguments that can be used to set the instance variables of an object to any values.
Also include a constructor that has only a single parameter of type int ; call this
single parameter wholeNumber and define the constructor so that the object will
be initialized to the rational number wholeNumber/1 . Also include a no-argument
constructor that initializes an object to 0 (that is, to 0

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> 1). Note that the numerator,