java - Detect an array from text file -

i have files containing text, have extract information, among have 2-dimensional double array(sometimes might missing - therefore you'll find "if" clause).

this way file formatted:

name=filename

groups={ group1=groupname group2=groupname minage= maxage= ages=[[18.0,21.0,14.7],[17.3,13.0,12.0]] }

i using java.nio.file.files, java.nio.file.path , java.io.bufferedreader read these files, having problems while trying convert strings representing arrays real java arrays:

    path p = paths.get(filename);     try(bufferedreader br = files.newbufferedreader(p)) {     string line = br.readline();     string filename = line.split("=")[1];      line = br.readline();      string[] arr = line.split("=");     string group1 = arr[2].split(" ")[0];      string group2 = arr[3].split(" ")[0];      integer minage = integer.parseint(arr[4].split(" ")[0]);     integer maxage = integer.parseint(arr[5].split(" ")[0]);      double[][] ag = null;     if (line.contains("ages")) {         string age = arr[6].trim().replace("}", "").replace("[[", "").replace("]]", "").trim();         string[] arrage = weights.split(",");         //don't know here on, since number of arrays inside          //the first 1 may vary 1 2 (e.g might find: [[3.0, 4.0]] or [[3.0, 7.0],[4.0,5.0]])         //this trying         ag = new double[1][arrage.length];         (int = 0; < arrage.length; i++)             ag[0][i] = double.parsedouble(arrage[i]);     } } catch (exception e) {     e.printstacktrace(); } 

is there way detect array text without doing trying in code or there way extract correct 2-dimensional array reading file formatted way?

one more question: there way print 2-dimensional array that? if yes, how? (by using arrays.tostring this: [[d@69222c14])

you can use regex extract 2 dimensional array string.

string groups="{ group1=groupname group2=groupname minage= maxage= ages=[[18.0,21.0,14.7],[17.3,13.0,12.0]] }";     string pattern = "(\\[\\[.+\\]\\])";     pattern r = pattern.compile(pattern);     matcher m = r.matcher(groups);     if (m.find( ))          system.out.println(m.group());   

the output above code is:

[[18.0,21.0,14.7],[17.3,13.0,12.0]]