Uses of Interface
org.bukkit.entity.Entity

Packages that use Entity 
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.entity
Interfaces for non-voxel objects that can exist in a world, including all players, monsters, projectiles, etc.
org.bukkit.entity.minecart
Interfaces for various Minecart types.
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.event.vehicle
org.bukkit.event.world
Events triggered by various world states or changes.
org.bukkit.inventory
Classes involved in manipulating player inventories and item interactions.
org.bukkit.loot
Classes relevant to loot table manipulation and generation.
org.bukkit.util
Multi and single purpose classes to facilitate various programmatic concepts.
org.spigotmc.event.entity
Spigot-specific entity events.