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javasplit
Maram Al-Zu'bi
Maram Al-Zu'bi

Reputation: 41

Java String Split issue for latitude and longitude

I'm writing a constructor for class LatLong that should take a string representation such as "3430E 5256N" ,and convert that to two double numbers, latitude and longitude.

How should I do that?

I wrote this so far but don't know how to remove the E and N when splitting:

public LatLong(String latlong) { 
    String[] parts = latlong.split(" ");
    String latitude = parts[0];
    String longitude = parts[1];
}

Also, if a user entered 34.5, it it will take 34 and multiply 0.5*60 to get the minutes which is 30, which would look like 3430, and depending on the number, it should determine what cardinality it is - North, South, East, or West.

Upvotes: 2

Views: 1111

Answers (4)

Andrei Amarfii
Andrei Amarfii

Reputation: 725

String coordinates = "3430E 5256N";

    String[] split = coordinates.split(" ");
    String latitude = split[0];
    String longitude = split[1];

    int indexOfPoint = latitude.indexOf(".");
    if (indexOfPoint != -1) {
        //we don't have point in string representations, so just remove the letter
        latitude = latitude.replace("E", "");
        latitude = latitude.replace("W", "");
    } else {
        //the string representation contains a point
        String valueAfterPoint = latitude.substring(indexOfPoint);
        valueAfterPoint = valueAfterPoint.replace("E", "");
        valueAfterPoint = valueAfterPoint.replace("W", "");
        double minutes = Double.parseDouble(valueAfterPoint);
        minutes*=60;
        latitude+=minutes;
    }

    //the samething with longitude, just remove letters N and S in replace statements.

Upvotes: 0

Kore
Kore

Reputation: 436

You can do this to remove any last letter of a string, use:

String latitude = parts[0].substring(0,parts[0].length()-1); 
String longitude = parts[1].substring(0,parts[1].length()-1);

Upvotes: 0

jso
jso

Reputation: 564

You can simply retrieve the double values from the input string using Scanner.

Double lat, long;

Scanner scanner = new Scanner(latlong);
scanner.useDelimiter("[^\\d,]");

while (scanner.hasNextDouble() || scanner.hasNext()) {
    if (scanner.hasNextDouble()) {
        if (lat == null) {
            lat = scanner.nextDouble(); // First setting the latitude
        } else {
            long = scanner.nextDouble(); // Then longitude and stopping
            break;
        }
    } else {
        scanner.next();
    }
}

scanner.close(); // Edit: forgot the close in original answer

Any other conversions (as you mentioned 34.5 as input) can be done easily afterwards once you have the doubles themselves.

Note that the E and N letters are part of the latitude and longitude definitions. Regardless your question, I believe that you should eventually save them also.

Upvotes: 0

sam
sam

Reputation: 2033

Use substring

String latitude = parts[0].substring(0,4);
String longitude = parts[1].substring(0,4);

Upvotes: 1

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