Using an array to read from and write to files

my problem is, I do not know how to do this program, it's like an inventory warehouse program that uses an array to store the items, then I have to use a keyboard input to run through the program the first time, using a write method to save the file, and a read method to go through the program a second time and resave it to a different file with the write method, I've asked countless times for help, but the instructor just won't help, so I was hoping I could get some help here, and if I don't get this done, I'm going to end up failing the class.
also, the requirements are listed here as well, so it can be better understood.
Write a program that:
1. allows the user to choose whether the inventory data comes from a file or from the keyboard
2. allows for up to 20 inventory items
3. if the data comes from the keyboard, asks for all inventory information (item name, number in stock,
initial warehouse, and value of one item)
4. if the data comes from a file, displays the inventory information for the item.
5. for each item, asks the user how many items to add or delete from inventory
6. determines whether an item must be moved to a different warehouse and changes the location if
necessary (note, it may be necessary to move an item to a smaller warehouse)
7. once all inventory changes have been made, for each warehouse displays the items in the warehouse, the
total number of items in the warehouse, and the total value of the items in the warehouse.
8. once all inventory changes have been made, stores the item information in a file (which can be used for
the next program run)
9. asks the user for the names of the input file (if data is coming from a file) and the output file (always).
p.s. I can post the source code for it if it's required for the help.
Thanks,
Xandler

my specific question is how I would go about using the scanner utility to tell it to input from the file or keyboard, if from keyboard it's manually item information is done manually, if from file it asks the user for the file name and the user selects it, then it saves it to a file, can't really post what I've tried because that's the problem, I don't know how to go about doing it and the instructor won't help me, I know though that it requires a file read method for the 2nd run, and a keyboard input for the first and a write for the saving of the file(s).
Thanks,
Xandler

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