"XP SHOP" on bukkit?

Hello guys, i'm trying to developer a pvp system/xp:

When someone kill a player, the killer win 1 experiencie, and they can swap this for enchantments/armor etc
I finished the give xp system, but i can't developer the buy. Per example

Command: /diamond
if (player.getExperience().WHAT I PUT HERE?)
If player has 10 experience, he can buy a item, per example?
HELP ?

Sorry for my english, i'm brazilian :c

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

It should be player.getLevel().

 

I think too, but i cant get another variables with . after player.getLevel() o_o

 

&& for and comparisons, || for or comparisons.

 

Oh thanks man, saved my life