Uses of Class
org.bukkit.block.BlockFace

Packages that use BlockFace 
Package Description
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.event.hanging
org.bukkit.event.player
Events relating to players.
org.bukkit.material
Classes that represents various voxel types and states.
org.bukkit.material.types
Classes relevant to specific material types.
org.bukkit.util
Multi and single purpose classes to facilitate various programmatic concepts.