Im not sure how serialization works. This is just a newbie question.

Lets say I have 25 objects...can they easily be individually written and read from a single file? I can only have one of these classes instantiated at a time, so I need to save the previous one before I create another. But im not sure how the file 'looks'. for example can I just say

Save(object1);
then just as easily (I know these functions dont exist...just theory)
Load(object1);
Load(object2);
...etc

Any info would be appreciated,
Thanks,
Steve