Comparing Performance of int and Integer

Question

Which one is best in programming - int or Integer? Especially whenever both are doing the same task?

I am writing an appli

Answer 1

Use int wherever possible. Use Integer only if:

• You need a way to represent "no value" or "uninitialized". Integer can be null, an int always has an int value.
• You want to use collections like List (though you can use int externally and have autoboxing hide the fact that the collection internally stores Integer instances).
• You're using an API, framework or tool that requires you to use Integer or Object, or doesn't work with primitive types.
• You need to be able to synchronize on the object (very unlikely).