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If want to use the number of items in a list to control how many times to go around a loop, you should use a for loop.
What will the code inside the loop do?

The loop does not need to be in the...

What is to be done in the while loop? What will control when the loop starts and end?

see the tutorial for interfaces:
http://docs.oracle.com/javase/tutorial/java/concepts/interface.html...

Start by making a list of the steps the program must do to do the task. Start at the first step in the list, code it, compile and test the program. When it works move to the second step.
The first...