ConcurrentModificationException使用迭代器循环时

Question

I'm using an iterator but I still seem to get the modification exception when calling iterator.next()

public void render(Graphics g) {
    if(consoleShown) {

        int boxHeight = 0;

        Iterator<String> iterator = output.iterator();
        while(iterator.hasNext()) {
            boxHeight += ((int)writefont.getStringBounds(iterator.next(), frc).getHeight());
        }

        if(boxHeight > 225) {
            boxHeight = 225;
        }

        for(int i = offset; i < offset + 25; i++) { //Offset being the line from the list being displayed.
            if(i < output.size()) {
                //Inverse the range to reverse the order of the list being displayed.
                //The irriterator adds the new value to the beginning of the list and not the end to avoid exceptions.
                g.drawString(output.get((int)(Utils.inverseRange(i, output.size())) - 1), 10, (i - offset + 1) * (int)writefont.getStringBounds(output.get(i), frc).getHeight());
            }
        }

        g.drawLine(0, boxHeight + 3, game.getWidth(), boxHeight + 3);
        g.drawString(input, 10, boxHeight + 12);
    }
}

My assumption is that I'm accessing the list using output.get(i) further down but I don't think there's a possible way I could add an iterator in that scenario.

Basically I have a list of strings, each string has the font height measured and added to an integer.

Answer 1

Are you sure the modification exception is related to the iterator? There is a lot going on in that line, there are several other possible things that could be going wrong, not related to your iterator.

I would recommend breaking that line up into several lines of code and assigning the results of iterator.next() to a variable.