ModCap Class

public class ModCap implements ICapabilitySerializable<FloatNBT> {

    @CapabilityInject(IModCap.class)
    public static final Capability<IModCap> MOD_CAP = null;

    private final LazyOptional<IModCap> instance = LazyOptional.of(MOD_CAP::getDefaultInstance);

    //method to register the capability in main class without having too much text.
    public static void register() {
        CapabilityManager.INSTANCE.register(IModCap.class, new ModCapStorage(), ModCapMethods::new);
    }

    @Nonnull
    @Override
    public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> tag, @Nullable Direction side) {
        return MOD_CAP.orEmpty(tag, instance);
    }

    @Override
    public FloatNBT serializeNBT() {
        return (FloatNBT) MOD_CAP.getStorage().writeNBT(
                MOD_CAP,
                instance.orElseThrow(
                        () -> new IllegalArgumentException("LazyOptional cannot be empty!")),
                null);
    }

    @Override
    public void deserializeNBT(FloatNBT nbt) {
        MOD_CAP.getStorage().readNBT(
                MOD_CAP,
                instance.orElseThrow(
                        () -> new IllegalArgumentException("LazyOptional cannot be empty!")),
                null, nbt);
    }
}