Why am I getting “Local variables referenced from an inner class must be final”?

Question

I\'m not even sure if this code will do anything even if it works, but I don\'t know what to do to get rid of the \"Local variables referenced from an inner class must be final

Answer 1

You haven't shown all the code, but I suspect that adding:

final int i0 = i;

inside your loop and using i0 instead of i as the index for your arrays should fix the error.

Alternatively, as commented by @James_D, you can also add Sprite sprite = fireballRight[i]; before the anonymous class and use sprite inside the handle method.

Note that the final modifier is optional in this case with Java 8+.

Answer 2

As it says, the var i needs to have the final prefix. Change the code to something like this:-

    for(int i = 0; i < 50; i++) {
        final int i2 = i;
        new AnimationTimer()
        {
            public void handle()
            {      
                fireballRight[i2].setImage("puercosloco/fireballright.png"); // Use i2 instead of i.

Answer 3

You can do the field private and static.