Integer v/s int

Posted by Siddhartha on Stack Overflow See other posts from Stack Overflow or by Siddhartha
Published on 2012-09-01T03:13:07Z Indexed on 2012/09/01 3:38 UTC
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java

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wrapper

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primitive

Read this on the oracle docs java.lang page:

Frequently it is necessary to represent a value of primitive type as if it were an object. The wrapper classes Boolean, Character, Integer, Long, Float, and Double serve this purpose.

I'm not sure I understand why these are needed. It says they have useful functions such as equals(). But if I can do (a==b), why would I ever want to declare them as Integer, use more memory and use equals()? How does the memory usage differ for the 2?

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