Java determines whether list contains a certain value

contains(Object o)；

try {
    List list = new ArrayList();
    List equipmentLocationList = locationService.getUserTrajectoryList();
    List list2 = new ArrayList();
    for (Location location : equipmentLocationList) {
        // 过滤时间相同的数据
        if (list2.contains(location.getDeviceTime().getTime())) {
            continue;
        }
        EcgUser user = new EcgUser();
        user.setLatitude(location.getLatitude());
        user.setLongitude(location.getLongitude());
        list.add(user);
        list2.add(location.getDeviceTime().getTime());
    }
    System.out.println(list2);
    return getResponse(list);
} catch (Exception e) {
    logger.error("", e);
    return getResponse(ErrorCodeConstant.FAIL.getCode());
}