Uses of Interface
org.bukkit.block.data.BlockData

Packages that use BlockData 
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.block.data.type
Specific BlockData classes relevant to only a given block or set of blocks.
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.generator
Classes to facilitate world generation implementation.
org.bukkit.inventory.meta
The interfaces used when manipulating extra data can can be stored inside item stacks.