java - Take values from a text file and put them in a array -

for in program using hard-coded values, want user can use text file , same result.

import java.io.ioexception; import java.io.bufferedreader; import java.io.filereader; import java.io.file;  public class a1_12177903  { public static void main(string [] args) throws ioexception {     if (args[0] == null)     {         system.out.println("file not found");     }     else     {            file file = new file(args[0]);     filereader fr = new filereader(file);     bufferedreader br = new bufferedreader(fr);     string line = "";      while (br.ready())     {         line += br.readline();     }      string[] work = line.split(",");      double[] doublearr = new double[work.length];      (int =0; < doublearr.length; i++)     {         doublearr[i] = double.parsedouble(work[i]);     }       double maxstartindex=0;     double maxendindex=0;     double maxsum = 0;      double total = 0;     double maxstartindexuntilnow = 0;      (int currentindex = 0; currentindex < doublearr.length; currentindex++)     {          double eacharrayitem = doublearr[currentindex];          total += eacharrayitem;          if(total > maxsum)         {             maxsum = total;             maxstartindex = maxstartindexuntilnow;              maxendindex = currentindex;         }         if (total < 0)         {             maxstartindexuntilnow = currentindex;             total = 0;         }     }      system.out.println("max sum         : "+        maxsum);     system.out.println("max start index : "+ maxstartindex);     system.out.println("max end index   : "   +maxendindex);   } } } 

i've fixed takes in name of text file command line. if has ways improve this, i'll happily accept improvments.

you can java8 streams, assuming each entry has it's own line

double[] doublearr =  files.lines(pathtofile)                            .maptodouble(double::valueof)                            .toarray(); 

if using on production systems (rather exercise) worth while create stream inside try resources block. make sure input file closed properly.

try(stream<string> lines = files.lines(path)){    doublearr =  stream.maptodouble(double::valueof)                       .toarray(); } 

if have comma separated list, need split them first , use flatmap.

  double[] doublearr =  files.lines(pathtofile)                            .flatmap(line->stream.of(line.split(","))                            .maptodouble(double::valueof)                            .toarray();