The left-hand side of an assignment must be a variable

Question

Why doesn\'t this work?

private List xShot = new ArrayList();
     ...codes
     ...codes
     ...codes
     ...codes
     xSho         


        

Answer 1

xShot.get(0) returns an object; it isn't a variable, so you can't assign to it.

Also, Integer is immutable (you can't change its value), so you would have to replace the object at position 0 with a new Integer that has the calculated value.

You can achieve the intention of that line like this:

xShot.set(0, xShot.get(0) + 5);