Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial


TC Ooi
TC Ooi
5,858 Points

Object data type vs Primitive data type

I was learning collection and I saw the type declared are object data type e.g. Integer and Character instead of int or char. Can I know when to use the correct data type?

1 Answer

Simon Coates
Simon Coates
28,694 Points

With collections, you typically want the object type. So a collection of characters might be List<Character>. The Character class is a 'wrapper' class. It's a class that exists to allow a primitive char to fit into places that need an object. Auto boxing and unboxing is a process where a primitive converts to a object wrapper type or back again. ( see https://docs.oracle.com/javase/tutorial/java/data/autoboxing.html )