Uses of Interface
org.bukkit.block.BlockState

Packages that use BlockState 
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.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.world
Events triggered by various world states or changes.
org.bukkit.inventory.meta
The interfaces used when manipulating extra data can can be stored inside item stacks.