More efficient way of assigning values to items, rather than tons of if branches?

[SpectralGerbil]

Hiya. I have quite a Java-y question for you today that I'm hoping I can recieve some help with although I still feel it is related enough to Minecraft Forge to warrant posting here. I do apologise for the unclear title.

I'm somewhat experienced in Java; no expert, but I have a lot of time with it under my belt. I know a lot about it but still also have a lot to learn.

Essentially, I'm writing a new gameplay mechanic/system, and as part of this I pass an ItemStack to a custom function. I then need to  return different values, based on what ItemStack it is.

The immediate thought on how to do this is with multiple if branches. However, I worry this may have a performance impact. Since the function may well be called every single tick, or at least several times a second, I don't want to force the program to run through 100 if branches each tick, which I imagine would cause slowdown.

An example of what I would do is below. This is pseudocode, so ignore any errors. It's just to give an idea of the concept of what the code should do.

if (itemType == Items.LEATHER_HELMET) {
	defense += 4
    agility += 4
}
if (itemType == Items.IRON_HELMET) {
	defense += 7
}
if (itemType == Items.GOLD_HELMET) {
	defense += 3
    wisdom += 6
}

Unlike the above example however, I would likely have this iterating over anywhere from 50-200 items.
Is there a more efficient mechanism within Java (or Minecraft Forge) that would achieve the same result, without requiring so many iterations over if statements?

Edited April 9, 2022 by SpectralGerbil
Edits for clarity

[SpectralGerbil]

Just took a look at them, seems perfect! Thanks for the quick response and the help! Problem solved.