get Objective
Gets an Objective on this Scoreboard by name
Return
the Objective or null if it does not exist
Parameters
name
Name of the Objective
Throws
if name is null
Gets the Objective currently displayed in getClassById DisplaySlot on this Scoreboard
Return
the Objective currently displayed or null if nothing is displayed in that DisplaySlot
Parameters
slot
The DisplaySlot
Throws
if slot is null