java list遍历三种方法

        JSONArray jsonArray = new JSONArray();
        jsonArray.add("1");
        jsonArray.add("2");
        jsonArray.add("3");
        String jString = JSON.toJSONString(jsonArray);
        List<Integer> list = JSON.parseArray(jString, Integer.class);
        for (Integer a : list) {
            System.out.println(a);
        }
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }
        Iterator<Integer> iterator = list.iterator();
        while (iterator.hasNext()) {
            if (iterator.next() == 1) {
                iterator.remove();
            }
        }
        Iterator<Integer> iterator1 = list.iterator();
        while (iterator1.hasNext()) {
            System.out.println(iterator1.next());
        }