Uses of Interface
org.bukkit.block.Block

Packages that use Block 
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.command
Classes relating to handling specialized non-chat player input.
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.enchantment
Events triggered from an enchantment table.
org.bukkit.event.entity
Events relating to entities, excluding some directly referencing some more specific entity types.
org.bukkit.event.hanging
org.bukkit.event.inventory
Events relating to inventory manipulation.
org.bukkit.event.player
Events relating to players.
org.bukkit.event.vehicle
org.bukkit.inventory
Classes involved in manipulating player inventories and item interactions.
org.bukkit.projectiles
Classes to represent the source of a projectile
org.bukkit.util
Multi and single purpose classes to facilitate various programmatic concepts.