Uses of Class
org.bukkit.inventory.ItemStack

Packages that use ItemStack 
Package Description
org.bukkit
The root package of the Bukkit API, contains generalized API classes.
org.bukkit.block
Classes used to manipulate the voxels in a world, including special states.
org.bukkit.configuration
Classes dedicated to handling a plugin's runtime configuration.
org.bukkit.enchantments
Classes relating to the specialized enhancements to item stacks, as part of the meta data.
org.bukkit.entity
Interfaces for non-voxel objects that can exist in a world, including all players, monsters, projectiles, etc.
org.bukkit.event.block
Events relating to when a block is changed or interacts with the world.
org.bukkit.event.enchantment
Events triggered from an enchantment table.
org.bukkit.event.entity
Events relating to entities, excluding some directly referencing some more specific entity types.
org.bukkit.event.inventory
Events relating to inventory manipulation.
org.bukkit.event.player
Events relating to players.
org.bukkit.event.world
Events triggered by various world states or changes.
org.bukkit.inventory
Classes involved in manipulating player inventories and item interactions.
org.bukkit.inventory.meta
The interfaces used when manipulating extra data can can be stored inside item stacks.
org.bukkit.loot
Classes relevant to loot table manipulation and generation.
org.bukkit.material
Classes that represents various voxel types and states.
org.bukkit.potion
Classes to represent various potion properties and manipulation.