In this assignment, you will develop a small Java application with a GUI to help a business owner

record the personal and salary information of the employees in his$/$her organization. We assume that

there are at most $10$ employees. Each employee has the following personal information: first name,

last name, and social security number. In addition, each employee has an employment grade, basic

salary, and allowances. There are three employment grades: A$,$ B$,$ and C$.$ Your application should

help the business owner to determine the total payment for each employee based on the following

table:

When your application is run, it should prompt the business owner to enter the information of all

employees. Use the following form as a guide:

All information must be validated. For example, names cannot be empty. Also, salary and allowances

must be positive numbers. When the user clicks the Add button, your program should display an error

message listing all problems in the entered information and should ask the user to re$-$fill the form's

information. A Reset button exists in the form to clear all the form's input fields.