while loop - Java: read 2 files and compare line by line -

i'm trying compare 2 files line line. let's example:

file1

a,b,c,d,12 e,f,g,h,20 h,g,t,y,30 

file2

f,g,h,j,30 e,h,j,f,50 a,b,c,d,60 e,f,g,h,70 

i want output like:

a,b,c,d,12,50 e,f,g,h,20,70 

i've written code:

while ((line1 = bufferedformattedreadermaster.readline()) != null) {      temp1 = line1.substring(0, 7);     temp3 = line1.substring(8, 10);      while ((line2 = bufferedformattedreaderanalytical.readline()) != null) {          temp2 = line2.substring(0, 7);         temp4 = line2.substring(8, 10);          if (temp1.equals(temp2)) {              system.out.println("oh yes");             bufferedwriterfinalresults.write(temp1 + ","  +temp3 + "," + temp4);             bufferedwriterfinalresults.newline();             numberoffinalresults++;          }        } } 

but output only:

a,b,c,d,12,50  

and not next line.

the bufferedformattedreadermaster , bufferedformattedreaderanalytical can read 1 time. brush skills on i/o. did simple list based conversion of code. code may not compile have implement. there better ways well.

list<string> bufferedformattedreadermasterlist =new arraylist<string>(); list<string> bufferedformattedreaderanalyticallist =new arraylist<string>();     while ((line1 = bufferedformattedreadermaster.readline()) != null) {                     bufferedformattedreadermasterlist.add(line1 );                 }       while ((line2 = bufferedformattedreaderanalytical.readline()) != null) {                     bufferedformattedreaderanalyticallist.add(line2);                 }    for(string line1:bufferedformattedreadermasterlist) {                      temp1 = line1.substring(0, 7);                     temp3 = line1.substring(8, 10);                      for(string line2:bufferedformattedreaderanalyticallist) {                          temp2 = line2.substring(0, 7);                         temp4 = line2.substring(8, 10);                          if (temp1.equals(temp2)) {                              system.out.println("oh yes");                             bufferedwriterfinalresults.write(temp1 + ","  +temp3 + "," + temp4);                             bufferedwriterfinalresults.newline();                             numberoffinalresults++;                          }                        }                 }