Left hand support?

Hello everyone, i'm back because no one has made a tutorial on this yet...
Recently, as you probably know, Mojang has added the left hand. This got me thinking.
First, plugins such as CustomJoinItems do not really support 1.9, which means the
join items can be held in the left hand, and in some cases players can even clone the
items. I want to prevent this. And, i would also like to expand my java programming
knowledge, by being able to control the left hand using a custom plugin. Can someone explain this to me?

 

@Pikkachhu Raaicchu
The left hand can be accessed using

Code:java

Inventory.getItemInOffHand()

. It is also slot number 40 and can be accessed just like any other inventory slot.

 

So, someInventory.setItem(40, new ItemStack(Material.STONE, 1)); would do it?

 

@Pikkachhu Raaicchu
Correct.

 

@Pikkachhu Raaicchu
Actually, no. Slot "40", is the 41 slot, since slots start at 0. What you are looking for is actually slot 39. Also make sure that "someInventory" is an instanceof PlayerInventory first, or else the index may be out of bounds.

 

@Pikkachhu Raaicchu @AlvinB
Using PlayerInventory#setItemInOffHand(ItemStack item) is probably a bit safer and cleaner.

 

K thanks everyone

 

@Pikkachhu Raaicchu
If you have solved your problem, mark this thread as solved.