JAVA遍历list是对其操作

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@Test    public void remove(){        ArrayList<String> list = new ArrayList<>();        list.add("php");        list.add("java");        list.add("php");        list.add("php");        list.add("php");        list.add("php");        list.add("php");        list.add("vue");        list.add("js");          // 正常顺序循环会导致重复元素无法删除        for (int i = 0; i < list.size(); i++) {            if (list.get(i).equals("php")){                list.remove(list.get(i));            }        }          list.forEach(System.out::println);          System.out.println("------------");          // 使用倒叙循环        for (int i = list.size() - 1; i > -1 ; i--) {            if (list.get(i).equals("php")){                list.remove(list.get(i));            }        }          list.forEach(System.out::println);          System.out.println("============");          // 直接使用迭代器        Iterator<String> iterator = list.iterator();        while (iterator.hasNext()) {            String next =  iterator.next();            if (next.equals("php")){                list.remove(next);            }        }        list.forEach(System.out::println);      }