Sorting by index java -

i read file every line looks this: username,age,award

i need program 2 sorting types : by username , by age. had no problem first one, have no idea how sort age in such example.. tried switching name age in each line doesn't work. that's have ( it's reading file , displaying ):

try{             file file=new file(path);              bufferedreader read=new bufferedreader(new filereader(file));             string line=read.readline();             all+=line+"\n";             while(line!=null){                 line=save.readline();                 all+=line+"\n";             }              string [] tabusers=all.split("\n");                        string display="";                            for(int a=0;a<tabusers.length-1;a++){                         display+=tabusers[a]+"\n";             }              for(int c=0;c<tabusers.length-1;c++){                     system.out.println(tabusers[c]);          }           }         catch(exception ex){          } 

any ideas?

i have tried this, did not work :

  for(int b=0;b<tabusers.length-1;b++){                string eachline =tabusers[b];                 string [] splitline=eachline.split(",");                 splitline[0]=splitline[1];             } 

first names , ages each line. put things on 2 treemaps, 1 names keys , other age keys. like:

    string[] lines = new string[3];     lines[0] = "michael 25 award_1";     lines[1] = "ana 15 award_2";     lines[2] = "bruno 50 award_3";      string[] parts;     map<string, string> linesbyname = new treemap<string, string>();             map<integer, string> linesbyage = new treemap<integer, string>();      (string line : lines) {         parts = line.split(" ");         linesbyname.put(parts[0], line);         linesbyage.put(integer.parseint(parts[1]), line);     }      system.out.println("sorted name:");      (map.entry<string, string> entry : linesbyname.entryset()) {         system.out.println(entry.getvalue());     }      system.out.println("\nsorted age:");      (map.entry<integer, string> entry : linesbyage.entryset()) {         system.out.println(entry.getvalue());     }