Method readFromNBT

src/main/java/net/minecraft/item/ItemStack.java:201–229

Read the stack fields from a NBT object.

(NBTTagCompound nbt)

     * Read the stack fields from a NBT object.
     */
    public void readFromNBT(NBTTagCompound nbt)
    {
        if (nbt.hasKey("id", 8))
        {
            this.item = Item.getByNameOrId(nbt.getString("id"));
        }
        else
        {
            this.item = Item.getItemById(nbt.getShort("id"));
        }

        this.stackSize = nbt.getByte("Count");
        this.itemDamage = nbt.getShort("Damage");

        if (this.itemDamage < 0)
        {
            this.itemDamage = 0;
        }

        if (nbt.hasKey("tag", 10))
        {
            this.stackTagCompound = nbt.getCompoundTag("tag");

            if (this.item != null)
            {
                this.item.updateItemStackNBT(this.stackTagCompound);
            }
        }
    }

    /**
     * Returns maximum size of the stack.