Method setAmount

src/main/java/net/minecraftforge/fluids/FluidStack.java:189–194

(int amount)

    }

    public void setAmount(int amount)
    {
        if (getRawFluid() == Fluids.EMPTY) throw new IllegalStateException("Can't modify the empty stack.");
        this.amount = amount;
        updateEmpty();
    }

    public void grow(int amount) {
        setAmount(this.amount + amount);