RegistryHandler

public class RegistryHandler {

    public static DeferredRegister<Item> ITEMS = new DeferredRegister<>(ForgeRegistries.ITEMS, FirstMod.MOD_ID);
    public static DeferredRegister<Block> BLOCKS = new DeferredRegister<>(ForgeRegistries.BLOCKS, FirstMod.MOD_ID);
    public static DeferredRegister<TileEntityType<?>> TILE_ENTITY_TYPES = new DeferredRegister<>(ForgeRegistries.TILE_ENTITIES, FirstMod.MOD_ID);

    public static void init() {
        ITEMS.register(FMLJavaModLoadingContext.get().getModEventBus());
        BLOCKS.register(FMLJavaModLoadingContext.get().getModEventBus());
        TILE_ENTITY_TYPES.register(FMLJavaModLoadingContext.get().getModEventBus());
    }

    // Items
    public static final RegistryObject<Item> RUBY = ITEMS.register("ruby", ItemBase::new);

    // Blocks
    public static final RegistryObject<Block> RUBY_BLOCK = BLOCKS.register("ruby_block", RubyBlock::new);
    public static final RegistryObject<Block> DARK_FURNACE = BLOCKS.register("dark_furnace", DarkFurnace::new);

    // Block Items
    public static final RegistryObject<Item> RUBY_BLOCK_ITEM = ITEMS.register("ruby_block", () -> new BlockItemBase(RUBY_BLOCK.get()));
    public static final RegistryObject<Item> DARK_FURNACE_ITEM = ITEMS.register("dark_furnace", () -> new BlockItemBase(DARK_FURNACE.get()));

    // Tile Entities
    public static final RegistryObject<TileEntityType<DarkFurnaceTileEntity>> DARK_FURNACE_TILE_ENTITY = TILE_ENTITY_TYPES.register(
            "dark_furnace_tile_entity", () -> TileEntityType.Builder.create(DarkFurnaceTileEntity::new, DARK_FURNACE).build(null));

}