Before you begin, look at the Java: Text file - Input and Java Text file Output notes and sample code. You job will to create a class that will contain the basics of these two examples to allow the user to read and write the data from a text file.
After you have created this class, on the workbench you should be able to:
HAS-A
no instance variables currently required.
RESPONDS-TO
The constructor is empty
readList(String fileName; UserList ulist)
this method will read from fileName and add the user to the ulist
writeList(String fileName;UserList ulist)
for each user in the ulist, this method will write the userData to the file fileName