Uses of Class
org.bukkit.material.MaterialData

Packages that use MaterialData 
Package Description
org.bukkit
More generalized classes in the API.
org.bukkit.block
Classes used to manipulate the voxels in a world, including special states.
org.bukkit.entity
Interfaces for non-voxel objects that can exist in a world, including all players, monsters, projectiles, etc.
org.bukkit.generator
Classes to facilitate world generation implementation.
org.bukkit.inventory
Classes involved in manipulating player inventories and item interactions.
org.bukkit.material
Classes that represents various voxel types and states.