You need to have a Customer class to store this information. When users click on the Reset button, the text area above will be cleared. You should have a label to indicate this list. When users submit a customer information, the name of the customer should be added to the list. They are First Name, Middle Name, Last Name, Street 1, Street 2, City, State, Zip and Phone in order.
Users can make changes in the information in the text fields.
Before updating the information in the customer database you need to check if the first name, last name, street1, city, state, zip code, phone text fields are blank. If any one of them is blank throw an exception and let the user know about it. Also check if the zip code is 5 characters long and the phone number is in the right format. If not, throw an exception and let the user know. All text fields should be cleared.