The universally unique identifier(UUID) of this object
What to do after hit.
Test if the object collide with another object o.
Actions invoked after the entity is dead.
If the entity is dead.
How the entity move.
Render the object.
Get the firepower of the player
Reinitialize the player's state.
Set the player's firepower to the given float number.
The shape of the entity, used for collide test.
Check the state of the object, and if this need to be removed, true should be returned.
Get the X coordinate of the player in Double.
Set the X coordinate of the player.
the X coordinate of the player in Integer.
Get the Y coordinate of the player in Double.
Set the Y coordinate of the player.
the Y coordinate of the player in Integer.