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Lines you have commented (declaration and assignment of ProdName/quantity) are not bad or unuseful. They serve as the base for the rest you still need to do.

You have asked for other things:

1)...

Yes, sorry, I have not told you to change

StringTokenizer line;

to

String line;

Remember: readLine() returns a String ... not a StringTokenizer!

line is a String ... not a StringTokenizer.


while (line != null) {
StringTokenizer tokenizer = new StringTokenizer(line);
ProdName = tokenizer.nextToken();
quantity =...