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

If you just want to increment by 5 and aren't limited to List specifically, you could avoid arguably verbose xShot.set(0, xShot.get(0) + 5) and do this instead:

List xShot = new ArrayList();
xShot.get(0).addAndGet(5);

This will increment the value of the AtomicInteger in xShot.get(0) by 5 in-place without further ado.