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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I have a Unit class which has lots of fields in it as shown below:
Unit
public class Unit { private final int id; private final int beds; private final String city; private final double lat; private final double lon; // constructors and getters here // toString method }
I now have a List of Unit which is a List object which contains lots of Units. Now I need to find the nearest Units from List object to Unit x. Cap the results by limit.
List
Unit x
private List<Unit> nearestUnits(List<Unit> lists, Unit x, int limit) { List<Unit> output = new ArrayList<>(); // how do I sort lists object in such a way so that I can get nearest units here to "x"? return output; }
We have lat/long present in the Unit class so we can use that to calculate euclidean distance and do the comparison. I am confused on how to sort the list of units by shortest distance and get the nearest units. I am working with Java 7 as of now so I can't use Java 8.
public static double distance(double lat1, double lat2, double lon1, double lon2) { final int R = 6371; // Radius of the earth double latDistance = Math.toRadians(lat2 - lat1); double lonDistance = Math.toRadians(lon2 - lon1); double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2) + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * Math.sin(lonDistance / 2) * Math.sin(lonDistance / 2); double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)); double distance = R * c * 1000; // convert to meters distance = Math.pow(distance, 2); return Math.sqrt(distance); } private List<Unit> nearestUnits(List<Unit> lists, Unit x, int limit) { lists.sort(new Comparator<Unit>() { @Override public int compare(Unit o1, Unit o2) { double flagLat = x.getLat(); double flagLon = x.getLon(); double o1DistanceFromFlag = distance(flagLat, o1.getLat(), flagLon, o1.getLon()); double o2DistanceFromFlag = distance REPLY 0 views 0 likes 0 shares Facebook Twitter Linked In WhatsApp
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