Uses of Class

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