将输入的ArrayList更改为三个点

ArrayList<Point> points = new ArrayList<>();

for (int i = 0; i < originalList.size(); i += 2) {
    double x = originalList.get(i);
    double y = originalList.get(i + 1);
    Point point = new Point(x, y);
    points.add(point);
}

class Point {
    double x;
    double y;

    public Point(double x, double y) {
        this.x = x;
        this.y = y;
    }
}