I tryed out to add an enchantment when i am clicking on something but how to add enchantments?

i found that code but it seems outdated in my version, there is nothing with Enchantment.blablabla i dont  know what to fill there

addEnchantment(Enchantment.sharpness, 4);

In 1.12.2 you can add enchantments to an ItemStack like this.

ItemStack stack = new ItemStack(Items.DIAMOND_SWORD);
stack.addEnchantment(Enchantments.SHARPNESS,4);