Hey guys, I don't know why, but Minecraft sets the NBTTags of two ItemStacks equal. So I mean, I wrote this code:

slots[2].stackTagCompound = slots[1].stackTagCompound

But my problem is, every time I change the NBt from slots[2], it also changes slots[1], I think the solution is really simple and I'm also not new in Java, but sometimes even a good java programer gets stick in something easy java, sorry for that

 

public void updateEntity(){ 
	if(slots[2] == null && rh.getWorkingItemGroupBasedRecipe(slots) != -1 && System.currentTimeMillis() -10 > lastCrafted && !(System.currentTimeMillis()-50 > lastCrafted)){
		System.out.println("Gecraftet");
	}

	this.slots[2] = rh.addOutputSlotManagerforItemBase(slots, 2);
	if(rh.getWorkingItemGroupBasedRecipe(slots) != -1){
		lastCrafted = System.currentTimeMillis();
	}
	if(ItemStack.areItemStacksEqual(slots[1], slots[2])){
		System.out.println("Gleich");
	}
	craftingSystem();
	this.openInventory();
}

private void craftingSystem() {

	if(slots[0] != null && slots[1] != null){
		if((slots[0].getItem() == Extrashoes.SingleJetBoot || slots[0].getItem() == Extrashoes.JetBoots) && ItemGroup.isItemPartofItemGroup(slots[1].getItem(), Extrashoes.ModifiableShoesGroup)){
			handleJetStuff();
		}
	}


}

private void handleJetStuff(){

	if(slots[0].getItem() == Extrashoes.SingleJetBoot){
		if(!slots[1].stackTagCompound.getBoolean("Jetboots")){
			if(slots[1] != slots[2]){
				slots[2] = null;
				slots[2] = new ItemStack(Extrashoes.ModifiableShoe[Extrashoes.ModifiableShoesGroup.getNumberofIteminItemGroup(slots[1].getItem(), Extrashoes.ModifiableShoesGroup)]);
				slots[2].stackTagCompound = slots[1].stackTagCompound;
				slots[2].stackTagCompound.setString("TypeofBoot", "golden_boots");
				if(slots[2].stackTagCompound.getBoolean("SingleJetBoot")){

					if(slots[2].stackTagCompound.getDouble("Remaining Weight") > 5){
						slots[2].stackTagCompound.setBoolean("JetBoots", true);
						slots[2].stackTagCompound.setBoolean("SingleJetBoot", false);
						double rw = slots[2].stackTagCompound.getDouble("Remaining Weight");
						slots[2].stackTagCompound.setDouble("Remaining Weight", rw - 5);
					}
				}else{
					if(slots[2].stackTagCompound.getDouble("Remaining Weight") > 5){
						slots[2].stackTagCompound.setBoolean("SingleJetBoot", true);
						double rw = slots[2].stackTagCompound.getDouble("Remaining Weight");
						slots[2].stackTagCompound.setDouble("Remaining Weight", rw - 5);
					}
				}
			}
		}
	}
}

Take this code:

Object a = new Object();
Object b = a;

 

Both variables point to the same object! Variables are just pointers that point to an Object. If you change that object, all the variables stay the same, they still point to the same object. But of course the contents of the object then has changed in all the variables, because they point to the same thing.

You probably want to create a copy of the NBT, use .copy().

OMG thank you, I really forgot that, now it works thank you