Java determines whether list contains a certain value

contains method is used to determine whether the specified element is included in the list. Returns true if the specified element is contained in the list, false otherwise.

Syntax:

contains(Object o)；

o: To determine whether an element exists in the list.

Specific usage examples: traverse list data and filter out data with the same time

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());
}

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