Minecraft plug in Java?

How do you make an if query for an item display name?

So who the display name of the item "test" is, should this and that happen?

And I would also like to know how you can lure the Durabilitity to a certain state, eg Item xy Holtz sword should only have 40 of 59 and not go down, so it just stays at 40 :?

Minecraft version 1.8-1.8.9

Since you are apparently still at the very beginning, I recommend you to watch detailed tutorials on YouTube. If you ask for everything, you will not be able to move forward because it takes a long time and you will not take much with you.

ItemStack i =…;
ItemMeta i'm = i.getItemMeta ();
if (i'm.getDisplayName ()! = null) {
if (i'm.getDisplayName (). EqualsIgnore ("test")) {

Thank you 👍