[Resolved | 1.8.9] How to check if an itemstack in a slot is a certain item.

[noahc3]

Simple (hopefully) question. How can I compare the itemstack in a slot with an itemstack that I am checking for.

 

Eg. I am trying to check if slot index 0 has a diamond.

 

I've tried just comparing the itemstack in the slot with new ItemStack(items.whatever) however that does not work presumably because certain data such as how long the item has existed for is different from a newly generated itemstack.

 

Any help would be appreciated!

[noahc3]

Minecraft does not like me using getItem on the itemstack returned from the slot check ( this.getStackInSlot(0).getItem() ), crashes and throws a NullPointerException, even though I'm making sure to check that it isn't null before executing any code using it.

 

Crash report: http://paste.ee/p/CnMhU

 

Tile Entity Class where the error is thrown: http://paste.ee/p/tyuNv (getItem checks around line 204)

 

Help would be appreciated, and sorry for any hassle.

 

EDIT: Whoops! Needed to make sure the ItemStack itself wasn't null before setting a variable to Itemstack.getItem()

 

[Draco18s]

What happens when the player does not have an item in that slot?