Cloneableand Comparable

Part I: Short answer questions (75 points)

1.       You can always add a compareTo() method to a class without making it implementthe Comparable interface, so why do you need the Comparable interface? What are theadvantages of making your classes implement the Comparable interface when you want them toprovide a compareTo() method?

2.      What are your suggestion of features you think IDE should have that will improve userexperience, coding easiness, and program quality. Suggestions can be both java specificor in general for program development.

3.      To write a Java FX application (think a very simple one, like the ones youdid), what are the essential key things you need in your code?

4.      In both Java and Java FX, there are classes for graphics, such as font, color,and shapes. Are they the same? What are the differences?

5.       Why do we say that “mobile strategy” is more than developing a version ofyour website for smaller screen?

Part II: Programming task (25 points)

First International Resource Management, Inc. (aka. FIRM) asks you to develop programs to solve the following problem.

FIRM pays its employees on a weekly basis. FIRM has four types of employees: salaried employees, who are paid a fixed weekly salary regardless of the number of hours worked; hourly employees, who are paid by the hour and receive overtime pay; commission employees, who are paid a percentage of their sales; and salaried-commission employees, who receive a base salary plus a percentage of their sales. FIRM wants to implement a java application that performs its payroll calculations polymorphically. Of course each employ belongs to a department.

Based on the description of the problem and several discussions with the client, a class diagram is agreed upon and the class hierarchy is shown in the diagram. At first, the management wants to implement three employee types: HourlyEmployee, SalariedEmployee, and CommissionEmployee.

Development of Classes and an Interface

Employee: abstract super class

Attributes:

· Employee name: String

Methods:

· Constructor: with one parameter of employee name

· Get and set methods for the attribute

· earnings(): Abstract method that will return a double value

SalariedEmployee: subclassof Employee

Additional Attribute:

· weeklySalary: double

Methods:

· Constructor: with two parameters of employee name and weekly salary

· Constructor: with one parameter of employee name, and default salary is $800.

· Get and set methods for weeklySalary

· earnings(): return weekly salary

HourlyEmployee: subclass of Employee

Addition Attributes:

· wage: double

· hours: double

Methods:

· Constructor: with three parameters of employee name, wage, and hours

· Constructor: with two parameters of employee name and hours, default wage is $8.

· Get and set methods for wage and hours

· earnings(): if the employee worked overtime (hours>40), the overtime portion is paid half timemore than regular wage.

CommissionEmployee: subclass of Employee

Additional Attribute:

· grossSales: double

· commissionRate: double

Methods:

· Constructor: with three parameters of employee name, gross sales, and commission rate.

· Constructor: with two parameters of employee name and gross sales, and default rate is 0.05.

· Get and set for grossSales and commissionRate

· earnings(): commission is calculated as gross sales times commission rate.

BasePlusCommissionEmployee: subclass of CommissionEmployee.

All the classes also need to have a method to print out pay check, which will show company name, basic information of the employee, and earnings of the current week. An interface class Company is used for the purpose and all the employee types will implement this interface.

Company: interface

Attribute:

· Company name: First International Resource Management, Inc.

Methods:

· toString(): return a string including the key information about the employee

Programming Tasks

1. Please revise Employee class that it also implements Cloneableand Comparable. Two persons are the same if they have the same name. The compareTo() method should return 0 if the two names are the same. Return -1 (or a negative number) if this employee name precedes the argument string. Otherwise return a +1 (or a positive number). Clone() will create an object with the same information.

2. Use the class OrderArrayListto keep track of the employees. Maximum number is 500. When printing the list, sort data alphabetically. So, when adding employees into the list, it is sorted by employee name. You may need to examine the methods in OrderArrayListto make sure items are added in alphabetically. In the program, you can use fake data (like the ones in the following table) to populate the list and print the list out to see whether it works.

A sample run may look like this:

Ï «Ï ----jGRASP exec: java LastAssignment

ÏϧÏ

ÏϧÏFirst International Resource Management, Inc.

ÏϧÏSalary-based employee

ÏϧÏName: Avery Tolar

ÏϧÏEarnings: $1,000.00

ÏϧÏFirst International Resource Management, Inc.

ÏϧÏCommission employee

ÏϧÏName: Tammy Hemphill

ÏϧÏEarnings: $725.00

ÏϧÏFirst International Resource Management, Inc.

ÏϧÏHourly employee

ÏϧÏName: Wayne Tarrance

ÏϧÏEarnings: $500.00

ÏϧÏ

ÏϧÏ

ÏÏ©Ï ----jGRASP: operation complete.

Other requirements:

· JAVA programs:

oUse comments in your java program. It is also a good idea to use comments at the beginning of your code indicating programmer and project information.

oPractice good programming habits.

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