This tutorial is set by the author's setting without permission.

Use enumeration registered items:

 Public Enum Modites {

Test (Item :: NEW),
;;
Public Final Identifier ID;
Public final item item;
ModITEMS (Function  function) {{
Item = function.apply (new item.settings ());
Id = new Identifier ($ {modid}, name (). TOLOWERCASE (Locale.root));
}
Public static registry () {
For (moditedms value: valueS ()) {{
Registry.register (registries.Item, value.id, value.Item);
}
}
} 

Use enumeration registered blocks

 Public Enum Modblocks {

Test (block :: NEW);
Public Final Block Block;
Public final identifier id;
MODBLOCKS (Function  Function) {{
Block = function.apply (abstractBlock.settings.create ());
Id = new Identifier (modid, name (). TOLOWERCASE (Locale.root)+"_block");
} Public Static void registry () {) {)
For (modblocks value: values ​​()) {
Registry.register (registries.block, value.id, value.block);
}
}
} 

Use an enumeration creation model item bar

{pblic connection modmgRlets {

Test (stack-> fabricitemgroup.builder ());

Public final itemgroup itemgroup;

Public final identifier id;

MODITEMGROUPS (FUNCTION Function) {{

Id = new Identifier (modid, name (). TOLOWERCASE (Locale.root));

itemGroup = function.apply(ItemStack.EMPTY).displayName(Text.translatable("itemGroup.%s.%s".formatted(modid, id.getPath()))).build();

}

Public static void registry () {

For (moditedmgroups value: valueS ()) {{) {

Registry.register (registries.item_group, value.id, value.Itemgroup);

}

}

}

at last:

Add the registry method in the main class to register