Method addEnchantment

src/main/java/net/minecraft/item/ItemStack.java:887–904

Adds an enchantment with a desired level on the ItemStack.

(Enchantment ench, int level)

     * Adds an enchantment with a desired level on the ItemStack.
     */
    public void addEnchantment(Enchantment ench, int level)
    {
        if (this.stackTagCompound == null)
        {
            this.setTagCompound(new NBTTagCompound());
        }

        if (!this.stackTagCompound.hasKey("ench", 9))
        {
            this.stackTagCompound.setTag("ench", new NBTTagList());
        }

        NBTTagList nbttaglist = this.stackTagCompound.getTagList("ench", 10);
        NBTTagCompound nbttagcompound = new NBTTagCompound();
        nbttagcompound.setShort("id", (short)ench.effectId);
        nbttagcompound.setShort("lvl", (byte)level);
        nbttaglist.appendTag(nbttagcompound);
    }

    /**
     * True if the item has enchantment data