Method hasDisplayName

src/main/java/net/minecraft/item/ItemStack.java:646–649

Returns true if the itemstack has a display name

()

     * Returns true if the itemstack has a display name
     */
    public boolean hasDisplayName()
    {
        return this.stackTagCompound == null ? false : (!this.stackTagCompound.hasKey("display", 10) ? false : this.stackTagCompound.getCompoundTag("display").hasKey("Name", 8));
    }

    public List<String> getTooltip(EntityPlayer playerIn, boolean advanced)
    {