ResponseEntity的回答不正确<String>

@Controller
@RequestMapping("/logout")
public class AuthenticationController
{
    public static final String LOGOUTED = "logouted";

    @Resource(name = "requireHardLoginEvaluator")
    private RequireHardLoginEvaluator requireHardLoginEvaluator;

    @RequestMapping(value = "/status", method = RequestMethod.GET)
    public ResponseEntity<String> status(final HttpServletRequest request, final HttpServletResponse response)
    {
        if (!requireHardLoginEvaluator.evaluate(request, response))
        {
            return new ResponseEntity<String>(LOGOUTED, HttpStatus.OK);
        }

        return new ResponseEntity<String>(HttpStatus.UNAUTHORIZED);
    }

当我调试它时,变量 new ResponseEntity<String>(AUTHENTICATED, HttpStatus.OK) <200 OK,authenticated,{}>

我的问题是:这是什么原因 authenticated 转换为带有双引号的字符串,如 "authenticated" 在内部 ResponseEntity 例子