假設我們有以下類：public abstract class Investment {   private String investmentType;   // getters & setters}public class Equity extends Investment {}public class Bond extends Investment {}public class InvestmentFactory {    public static Investment getTypeFromString(String investmentType) {        Investment investment = null;        if ("Bond".equals(investmentType)) {            investment = new Bond();        } else if ("Equity".equals(investmentType)) {            investment = new Equity();        } else {            // throw exception        }        return investment;    }}以及以下內容@RestController：@RestControllerpublic class InvestmentsRestController {    private InvestmentRepository investmentRepository;    @Autowired    public InvestmentsRestController(InvestmentRepository investmentRepository) {        this.investmentRepository = investmentRepository;    }    @RequestMapping(RequestMethod.POST)    public List<Investment> update(@RequestBody List<Investment> investments) {       return investmentRepository.update(investments);    }}以及請求正文中的以下 json：[  {"investmentType":"Bond"},  {"investmentType":"Equity"}]如何在List<Investment> 不使用 Jackson 的@JsonSubTypes抽象類的情況下將 json 綁定或轉換為請求正文Investment，而是使用InvestmentFactory?