Customer class that contains:
• firstName: String data field.
• lastName: String data field
• address: String data field
• age: int data field
• The accessor and mutator methods for firstName, lastName, age,
and address.
• id: int data field. The first Customer should have an id of 32000 and
for any new Customer add 10.
• Constructor that creates a Customer with the specified first name,
last name, address, and age. Also, it should generate the Customer's
id.
• Override toString method. This method should return all details
about this account (firstName, lastName, address, id, and age)
• Override equals method. This method should return true if the
calling object is equal to the other object.
