Memory Graphs and GC

When looking at the amount of memory in use how should it's graph look like?

should it be slow steady rise?:
http://i.imgur.com/2LuWz.png

Rise->big drop:
http://i.imgur.com/0Mg2S.png

Trig function like patterns:
http://i.imgur.com/wjBlt.png

I'm in the process of making a java program and when i first start out it looks like the steady/no increase flat line, but then once i start using some of my other objects i get the rise-drop due to the allocation of new stuff per frame.

I've also tried start caching a lot of things that i feel will eventually repeat (like texts drawn) that why it doesn't have to keep allocating/deallocating them per frame.

When looking at the amount of memory in use how should it's graph look like?
A good program allocates all required memory at the start.