Method getData

src/main/java/org/bukkit/inventory/ItemStack.java:121–127

Gets the MaterialData for this stack of items @return MaterialData for this item

()

     * @return MaterialData for this item
     */
    public MaterialData getData() {
        if (Material.getMaterial(getTypeId()).getData() != null) {
            data = Material.getMaterial(getTypeId()).getNewData((byte) this.durability);
        }

        return data;
    }

    /**
     * Sets the MaterialData for this stack of items