Java Employee Database

Dear Java Specialists,

I need your expertise to help me on a Java program that i'm developing.
Its based on an Employee Records database that allows a person to
1. Add a new Employee Record
2. Delete an existing Employee Record
3. Modifying an existing Employee Record
4. Display of an Employee Record

The Employee class would have:
1. Name
2. Address
3. Employee ID(key)
4. Salary
5. Designation
6. Grade

A Manager class would extends from Employee with
1. Department
2. A group of Employees under his charge

I'm working towards having it developed with an GUI using packages from Awt/Swing.
The most challenging issues pertaining to coding was getting all the data from the file that was stored to be loaded into a data structure when the program starts.
(i.e. an Array of records of Vectors)
So, when the program terminates, the contents of the data structure should re-write the original.

Hence,I'm looking to the guidance and source examples that someone could provide through this channel.
Appreciate your time and have a nice day.
James.