Uses of Class
org.bukkit.Material

Packages that use Material 
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.block.data
Generalized BlockData classes.
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.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.generator
Classes to facilitate world generation implementation.
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.material
Classes that represents various voxel types and states.