Long vs Integer, long vs int, what to use and when?

Question

Sometimes I see API\'s using long or Long or int or Integer, and I can\'t figure how the decision is made for that?

Answer 1

• By default use an int, when holding numbers.
• If the range of int is too small, use a long
• If the range of long is too small, use BigInteger
• If you need to handle your numbers as object (for example when putting them into a Collection, handling null, ...) use Integer/Long instead