Method setType

src/main/java/org/bukkit/inventory/ItemStack.java:73–75

Sets the type of this item Note that in doing so you will reset the MaterialData for this stack @param type New type to set the items in this stack to

(Material type)

     * @param type New type to set the items in this stack to
     */
    public void setType(Material type) {
        setTypeId(type.getId());
    }

    /**
     * Gets the type id of this item