java - 如何同时迭代这些列表？

Question

这就是我想要实现的目标:

    public ArrayList<Point> startPoints = new ArrayList<Point>();
    public ArrayList<Point> endPoints = new ArrayList<Point>();

            for (Point startPoint : startPoints) { // <-- How do I do I do 2 at the same time?
                 g.fillOval(startPoint .x, startPoint.y, 10, 10);
                 g.drawLine(startPoint .x, startPoint.y, endPoint.x, endPoint.y);
            }

Answer 1

使用带有索引i的“普通”for。

// if list1 and list2 have the same length
for(int i = 0;i<list1.size();i++){
   list1.get(i); // do something with that
   list2.get(i); // do something else with that
}