How to Sum String double Value

Question

I have a string like 24.5 km10.1 km30.9 km.

I want to compute the sum of all the distances in the string but I'm not able to do it. I'm getting a NumberFormatException.

Here is my code

String stringValue = getDistanceOnRoad(lat, long, lat2, long2);
double sumValue = 0.0;

Log.d("my string is", stringValue);
try {
    sumValue = Double.parseDouble(stringValue);
    Log.d("distance there plus", String.valueOf(sumValue));
} catch (NumberFormatException e){
    System.out.println("not a number");
}

I'm getting the distance from this method, everything is working fine but I'm not able to compute the sum of all distances.

How to calculate distance between two locations using their longitude and latitude value

private String getDistanceOnRoad(double latitude, double longitude,
        double prelatitute, double prelongitude) {
    String result_in_kms = "";
    String url = "http://maps.google.com/maps/api/directions/xml?origin="
            + latitude + "," + longitude + "&destination=" + prelatitute
            + "," + prelongitude + "&sensor=false&units=metric";
    String tag[] = { "text" };
    HttpResponse response = null;
    try {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost httpPost = new HttpPost(url);
        response = httpClient.execute(httpPost, localContext);
        InputStream is = response.getEntity().getContent();
        DocumentBuilder builder = DocumentBuilderFactory.newInstance()
                .newDocumentBuilder();
        Document doc = builder.parse(is);
        if (doc != null) {
            NodeList nl;
            ArrayList args = new ArrayList();
            for (String s : tag) {
                nl = doc.getElementsByTagName(s);
                if (nl.getLength() > 0) {
                    Node node = nl.item(nl.getLength() - 1);
                    args.add(node.getTextContent());
                } else {
                    args.add(" - ");
                }
            }
            result_in_kms = String.format("%s", args.get(0));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result_in_kms;
}

Since when is `24.5 km10.1 km30.9 km` a number? I guess the exception is deserved. — Henry, Jan 04 '18 at 11:35
SO is not a free code writing service, please show your code/effort and what the actual problem is. In particular, you did not even make a try to calculate the sum. — Henry, Jan 04 '18 at 11:38
Do some research before directly postion a question here. Regex will be easy solution, Have look into [This](https://stackoverflow.com/questions/12234963/java-searching-float-number-in-string) . — ADM, Jan 04 '18 at 11:40
@VictorHerasmePerez, if you want to answer. Please post an actual answer — Nick Cardoso, Jan 04 '18 at 11:47
@SunilKumar Code for you: public class KmCalculator { public static void main(String[]args) { String distanceToBeSummed = "24.5 km10.1 km30.9 km"; String [] distanceArray = distanceToBeSummed.split(" km"); double totalDistance = 0; for (int index=0; index < distanceArray.length; index++) { totalDistance = totalDistance + Double.parseDouble(distanceArray[index]); } System.out.println(totalDistance); } } — Vishwa Dany, Jan 04 '18 at 11:50

score 1 · Answer 1 · edited Oct 20 '20 at 04:21

If your string is like 24.5 km10.1 km30.9 km, then before converting it to double you should parse the string.

String stringValue = getDistanceOnRoad(lat, long, lat2, long2);
double sumValue = 0.0;

Log.d("my string is", stringValue);
try {
  String[] distances = stringValue.split(" km");
  for (String distance: distances) {
    sumValue = sumValue + Double.parseDouble(distance);
  }
  Log.d("distance there plus", String.valueOf(sumValue));
} catch (NumberFormatException e) {
  System.out.println("not a number");
}

score 0 · Answer 2 · answered Jan 04 '18 at 11:41

Okay, the problem there is that you're trying to parse String S = "10.1 km"; to a double variable. However, the "km" part of the String isn't a number, so the java compiler isn't able to parse it. Instead define a double variable for the number of km: double km = 10.1 and a String variable for "km". Then (when you want to get It as an String) redefine the variable for km with the answer of the operation.

score 0 · Answer 3 · answered Jan 04 '18 at 11:43

0

Try this

String test = "24.5 km10.1 km30.9 km";
String[] parsedString = test.split("(km)");
double sum = 0;
for(String s : parsedString) {
    sum += Double.parseDouble(s.trim());
}

answered Jan 04 '18 at 11:43

Truong Giang Dam

500
3
9

java.lang.NumberFormatException: Invalid double: "" – Sunil Kumar Jan 04 '18 at 11:46
Oh. I have tested on my computer and everything is ok. Can you give me the string you wanna sum? I'll check again – Truong Giang Dam Jan 04 '18 at 11:49

score 0 · Answer 4 · edited Apr 18 '18 at 22:09

0

try this

String s = "24.5 km10.1 km30.9 km";

String[] items = s.split("km");
double result = 0;

for (int i = 0 ; i < items.length ; i++) {   
    result = result + Double.parseDouble(items[i]); 
}

System.out.print("result = " + result);

edited Apr 18 '18 at 22:09

Daniel Puiu

962
6
21
29

answered Jan 04 '18 at 11:43

S.Ali

29
7

java.lang.NumberFormatException: Invalid double: "" – Sunil Kumar Jan 04 '18 at 11:46
what is your exact string ? because its working fine in above string – S.Ali Jan 04 '18 at 11:48
My Log.d String => D/my string is: 24.5 km10.1 km30.9 km – Sunil Kumar Jan 04 '18 at 11:54
@S.Ali still with me, my solution is working fine with above string. – Truong Giang Dam Jan 04 '18 at 11:55

Bilal Halayqa · Answer 5 · 2018-01-04T12:17:45.017

0

You should split by km, then sum the values, here is the method :

private static double parseAndSum(String string) {

    double sumValue = 0.0;
    String[] nums = string.split("km");

    int i=0;
    for(i=0;i<nums.length;i++) {
        sumValue += Double.parseDouble(nums[i].trim());
    }
    return sumValue;
}

And here how you call it :

String string = getDistanceOnRoad(latitude, longitude, prelatitute, prelongitude);    
double result = parseAndSum(string);
System.out.println("Total is : " + result + "km");

edited Jan 04 '18 at 12:17

answered Jan 04 '18 at 11:44

Bilal Halayqa

932
1
6
25

java.lang.NumberFormatException: Invalid double: "" – – Sunil Kumar Jan 04 '18 at 11:48
I just ran it, check the screenshot attached. – Bilal Halayqa Jan 04 '18 at 11:51
My Log.d String => D/my string is: 24.5 km10.1 km30.9 km – Sunil Kumar Jan 04 '18 at 11:52
hmm. I have seen your's screenshot it's working but i don't know why i'm getting Invalid double: "" error. – Sunil Kumar Jan 04 '18 at 12:02
so the method getDistanceOnRoad returnes the string "24.5 km10.1 km30.9 km" ? – Bilal Halayqa Jan 04 '18 at 12:10
replace latitude, longitude, prelatitute, prelongitude with your values and try – Bilal Halayqa Jan 04 '18 at 12:18
Dear sir, I'm getting correct km of my distance.. But i'm not able to sum of all km – Sunil Kumar Jan 04 '18 at 12:19
well, assuming you are sure about the returned string, the method must work as I tested it. – Bilal Halayqa Jan 04 '18 at 12:20
yes sir, method is working fine -> I had get it https://stackoverflow.com/questions/6981916/how-to-calculate-distance-between-two-locations-using-their-longitude-and-latitu – Sunil Kumar Jan 04 '18 at 12:21
print the string returned from the method, is it the same as the one you mentioned in the question? – Bilal Halayqa Jan 04 '18 at 12:21
Ok, give me 1 min. i'll give u log.d – Sunil Kumar Jan 04 '18 at 12:22
D/distance there: 24.5 km D/distance there: 10.1 km D/distance there: 30.9 km – Sunil Kumar Jan 04 '18 at 12:24
these results are coming in different values, not in the same string, you see D/. While your original question's string is "24.5 km10.1 km30.9 km" – Bilal Halayqa Jan 04 '18 at 12:30
hmm, i understood. thank u so much for your answer i'll try. Thanks a lot :) – Sunil Kumar Jan 04 '18 at 15:02
java.lang.NumberFormatException: Invalid double: "" – Sunil Kumar Jan 05 '18 at 05:21
hi, I have used your method in getdistanceonroad(), I'm not getting any error but i'm not able to get sum value of it. double sumVaue = 0.0; sumVaue+=parseAndSum(result_in_kms); //sumVaue+=sumDigits(test); Log.d("distance there", String.valueOf(sumVaue)); – Sunil Kumar Jan 05 '18 at 05:36
My Log D: is D/distance there: 24.5 D/distance there: 10.1 D/distance there: 30.9 how to sum it – Sunil Kumar Jan 05 '18 at 05:37
did you go solution? – Sunil Kumar Jan 13 '18 at 06:01

How to Sum String double Value

5 Answers5