拆分CSV并存储在Java中的不同数组中

Question

My input string is of the format

12.8478746,77.6632938,5:20:38 PM
12.8478746,77.6632938,5:20:49 PM
12.8478746,77.6632938,5:40:05 PM
................................
12.8478746,77.6632938,5:40:14 PM

Number of rows is unknown. I need to parse the string and store it like (double lat,double long,string time). Also, I need to make a function call, with (lat,long,time) as arguments, 'n' times where n depends on number of rows of input string . How do I do this.

This is what I tried:

    String[] lines = result.split("\\s+"); // split on new lines

    for (int i = 0; i < lines.length; i++) {
        String[] temp = lines[i].split("\\s*,\\s*");
            double lat = Double.parseDouble(temp[0]);
            double lo = Double.parseDouble(temp[1]);
            AddMarker(lat,lo,temp[2]);
    }

This wont work because in "5:20:38 PM" there is a space between 5:20:38 and PM and in my input each row is separated by a space. So, I'm getting the error: Invalid double "PM"

Answer 1

What you need to do is to work differently with split , it should accept the the separator character, don't treat it as a regular expression:

String[] lines = result.split("\n");  // split on new lines

Or possibly:

String[] lines = result.split("\r\n");

And also:

String[] temp = lines[i].split(",");

If you want to store the date & time ("5:20:38 PM") as string, then just pass temp[2] as you already do. If you want to parse as DateTime or something like that, see this link .

Answer 2

You should use a regex. Example :

    final String regex = "(.*),(.*),(.*)";
    final String string = "12.8478746,77.6632938,5:20:38 PM";

    final Pattern pattern = Pattern.compile(regex);
    final Matcher matcher = pattern.matcher(string);

    matcher.find();

    double lat = Double.valueOf(matcher.group(1));
    double lo = Double.valueOf(matcher.group(2));
    String time = matcher.group(3);

    System.out.println("LAT: "+lat);
    System.out.println("LO: "+lo);
    System.out.println("TIME: "+time);

Result :

LAT: 12.8478746
LO: 77.6632938
TIME: 5:20:38 PM