Please, I need some help completing the Chapter 13, Exercise 9A, 9B, and 9C. Any help would be appreciated, thank you.

Chapter 13, Exercise 9...

9a. The Rochester Bank maintains customer records in a random access file. Write an application that creates 10,000 blank records and then allows the user to enter customer account information, including an account number that is 9999 or less, a last name, and a balance. Insert each new record into a data file at a location that is equal to the account number. Assume that the user will not enter invalid account numbers. Force each name to eight characters, padding it with spaces or truncating if necessary. Also assume that the user will not enter a bank balance greater than 99,000.00. Save the file as CreateBankFile.java.

9b. Create an application that uses the file created by the user in Exercise 9a and displays all existing accounts in account-number order. Save the file as ReadBankAccountsSequentially.java

9c. Create an application that uses the file created by the user in Exercise 9a and allows the user to enter an account number to view the account balance. Allow the user to view additional account balances until entering an application-terminating value. Save the file as ReadBankAccountsRandomly.java.