Reception pass json array, receiving and processing the background

Here the front desk pass over the json data format like this

[{
		"type": 0,
		"stem": "123",
		"deletionFlag": 1,
		"choice": ["A"],
		"postId": "123",
		"solution":["A", "B"],
		"score": 12.12,
		"materialIds": "123"
	},
	{
		"type": 1,
		"stem": "234",
		"deletionFlag": 1,
		"choice": ["A", "B", "C"],
		"postId": "234",
		"solution": ["A", "B"],
		"score": 12.23,
		"materialIds": "234"
	},
	{
		"type": 2,
		"stem": "345",
		"deletionFlag": 1,
		"choice": ["A", "B"],
		"postId": "345",
		"solution":["A", "B"],
		"score": 12.34,
		"materialIds": "345"
	}
]

Here, if the background by directly receiving List is not enough, since the choice of solution and still a data array, direct access being given
Thinking: Because json format is the key / value, you can use ListTo install, after removing key corresponding to the value by type

  // Save
    @RequestMapping(value = "/submit", method = RequestMethod.POST)
    public APIResponseBean saveHomeWork(@RequestBody List<Map<String, Object>> homeworklist) {

        if (homeworklist == null) {
                         throw new GlobalException (Constants.HTTP_UNPROCESSABLE_ENTITY, "Submissions parameter error.");
        }

        List<HomeworkBean> saveList = new ArrayList<>();

        for (Map<String, Object> homeworkBeanMap : homeworklist) {
                         // test
//            System.out.println(homeworkBean);

                         // Get the id id be judged according to whether to add or modify
            String id = (String) homeworkBeanMap.get("id");
            
                         / * Submit answer * /
            ArrayList solutionList = (ArrayList) homeworkBeanMap.get("solution");
            String solution = String.valueOf(solutionList);
                         ............................. omitted

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