ArrarList holds objects, not primitives...

[iti garg]

Hello everyone,
please tell me what does this statement mean...

ArrarList holds objects, not primitives.

please explian me with suitable example.

[Paul Sturrock]

An Object:

Integer foo = new Integer(1);

A primitive:

int bar = 1;

What the statement means is you can only put the first one in to an ArrayList. The difference would be more noticable if you tried to put a primitive into an array list pre-Java 5 (you'd get a compilation error). But now if you do this:

ArrayList list = new ArrayList();
list.add(bar);

autoboxing will convert bar into an Integer and add that.
[ November 07, 2008: Message edited by: Paul Sturrock ]