Inheritance - Java Concepts - page 677

account with the interest rate and the number of months to maturity. In the
addInterest method, decrement the count of months. If the count is
positive during a withdrawal, charge the withdrawal penalty.
΢ Exercise P10.3. Implement a subclass Square that extends the
Rectangle class. In the constructor, accept the x- and y-positions of the
center and the side length of the square. Call the setLocation and
setSize methods of the Rectangle class. Look up these methods in
the documentation for the Rectangle class. Also supply a method
getArea that computes and returns the area of the square. Write a sample
program that asks for the center and side length, then prints out the square
(using the toString method that you inherit from Rectangle ) and the
area of the square.
΢ Exercise P10.4. Implement a superclass Person . Make two classes,
Student and Instructor , that inherit from Person . A person has a
name and a year of birth. A student has a major, and an instructor has a
salary. Write the class definitions, the constructors, and the methods
toString for all classes. Supply a test program that tests these classes
and methods.
΢΢Exercise P10.5. Make a class Employee with a name and salary. Make a
class Manager inherit from Employee . Add an instance field, named
department , of type String . Supply a method toString that prints
the manager's name, department, and salary. Make a class Executive
inherit from Manager . Supply appropriate toString methods for all
classes. Supply a test program that tests these classes and methods.
΢ Exercise P10.6. Write a superclass Worker and subclasses
HourlyWorker and Salaried-Worker . Every worker has a name
and a salary rate. Write a method computePay(int hours) that
computes the weekly pay for every worker. An hourly worker gets paid the
hourly wage for the actual number of hours worked, if hours is at most
40. If the hourly worker worked more than 40 hours, the excess is paid at
time and a half. The salaried worker gets paid the hourly wage for 40
hours, no matter what the actual number of hours is. Supply a test program
that uses polymorphism to test these classes and methods.