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NBT, CompoundTag, Tag, ListTag of floats


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Describing what I want to do is fairly simple. I want to use this command but in code:

/data modify entity @e[type=minecraft:zombie,sort=nearest,limit=1] HandDropChances set value [0.0f, 0.0f]

The entity and the fact that it contains HandDropChances are already known, so ignore those parts of the issue

the specific part I am struggling with is making it accept [0.0f, 0.0f]

the following is part Java and part psuedocode of what I am looking to do.

void someVoid(Entity ent) {
  CompoundTag compTag = ent.saveWithoutId(new CompoundTag());
  String name = "HandDropChances";
  if (compTag.contains(name)) {
    //.setTag doesn't exist of course,
    //and [0.0f, 0.0f] is nonsense,
    //but I don't know how I ought to declare it in order to get it into the form I need to actually achieve this.
    compTag.setTag(name, [0.0f, 0.0f]);
    // What I've been trying to do to make this happen is below
    ListTag tagList = (ListTag) compTag.get(name);
    //or something like that, anyway. but floats aren't Tags so this, of course, doesn't work


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There's a TagParser class if you want to explore what gets created for some SNBT.

But I think what you are looking for is FloatTag?



If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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Thanks! I think I'd been in such a headache over it all day that I just missed the fact that I'd already found that part of the answer, your stating the obvious is what finally pushed me up onto the ledge. I appreciate it.

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