Create a purchase class netbean

 a. Create a class named Purchase. Each Purchase contains an invoice
number, amount of sale, and amount of sales tax. Include set methods for the
invoice number and sale amount. Within the set() method for the sale amount,
calculate the sales tax as 5% of the sale amount. Also include a display method
that displays a purchase’s details. Save the file as b. Create
an application that declares a Purchase object and prompts the user for
purchase details. When you prompt for an invoice number, do not let the user
proceed until a number between 1,000 and 8,000 has been entered. When you
prompt for a sale amount, do not proceed until the user has entered a
nonnegative value. After a valid Purchase object has been created, display the
object’s invoice number, sale amount, and sales tax. Save the file as 
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