java - 如果满足该语句，则中断 while 语句及其后面的代码

Question

如果距离小于 15，我会尝试返回 routeList，并且如果是这种情况，请勿在 while 语句之后运行代码。目前，routelist 正在 if 语句中被覆盖。我怎样才能达到这个目标？

感谢任何帮助。

    public ArrayList<Integer> detectRoute(double latD, double longD) {

        ArrayList<Integer> routeList = new ArrayList<Integer>();
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    PreparedStatement preparedLatLongName = con
                            .prepareStatement("SELECT lat, longi, name from stops");
                    ResultSet rsLLN = preparedLatLongName.executeQuery();

                    // ArrayList<Double> distanceHistory = new ArrayList<Double>();
                    List<StopItem> distanceHistory = new ArrayList<>();

                    while (rsLLN.next()) {
                        double latStop = rsLLN.getDouble("lat");
                        double lonStop = rsLLN.getDouble("longi");
                        String nameStop = rsLLN.getString("name");
                        double distStop = haversineDistance(latD, longD, latStop,
                                lonStop);
                        StopItem newItem = new StopItem(nameStop, distStop );
                        distanceHistory.add(newItem);


                        // TODO add the speed here.
                        if (distStop <= 15) {
                            routeList = getByStop(con, calendar, WDay, rsLLN);
                            break;
                        }

                    }
                    //Find the shortest distance and its related longi and lati
                    Collections.sort(distanceHistory);
                    double shortestDistance = distanceHistory.get(0).getStopDist();
                    String nameShortestDistance = distanceHistory.get(0).getNameStop();
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        return routeList;
}

Answer 1

您甚至不必打破循环。只需将 break 替换为 returnrouteList 即可。