How do I trace this error..?

Newbie & Debugging Questions
#21

thanks for the tip. changed it to:


        if (showInfo.size() > 5) {
            int sz = showInfo.size();
            for (int i = 0; i < sz-5; i++) {
				showInfo.remove(i);
			}
        }
#22

That is almost certainly not what you want.

for (int i = 0; i < N; i++) showInfo.remove(i);

this ‘unrolls’ to:
showInfo.remove(0); showInfo.remove(1); showInfo.remove(2); showInfo.remove(3); ...

Started with: A,B,C,D,E,F,G,H,I
Remove index 0 => B,C,D,E,F,G,H,I
Remove index 1 => B,D,E,F,G,H,I
Remove index 2 => B,D,F,G,H,I
Remove index 3 => B,D,F,H,I

While you want:
for (int i = 0; i < N; i++) showInfo.remove(0);

Started with: A,B,C,D,E,F,G,H,I
Remove index 0 => B,C,D,E,F,G,H,I
Remove index 0 => C,D,E,F,G,H,I
Remove index 0 => D,E,F,G,H,I
Remove index 0 => E,F,G,H,I

Which is why I advised you to use removeFirst()