java - what is the most efficient way to extract rows from one CSV file using input from another CSV file -

i have 2 csv files input1.txt , input2.txt. need take 1 value input1.txt , search in input2.txt , if found, write entire record input2.txt file.

i have written below code , working slow. there more efficient way achieve this?

import java.io.*;  public class filecompare {     private static final eol = system.getproperty("line.separator");      public static void main(string args[])         throws ioexception     {         filereader in = null;         filereader comp = null;         filewriter out = null;         filewriter out2 = null;          try {             in = new filereader("input1.txt");  //file containing value search             out = new filewriter("matching.txt"); // file write output             out2 = new filewriter("notfound.txt"); // file write non matching             bufferedreader br = new bufferedreader(in);                   string p, q;             boolean done;              // read input file line line             while ((p = br.readline()) != null) {                 done = false;                 string str = p;                 string delims = "[\\t]";                  string[] tokens = str.split(delims);                  long acno = long.parselong(tokens[5]);  // value in input1.txt  checked against input2.txt                 long si = long.parselong(tokens[31]);                  comp = new filereader ("input2.txt");  // file containing  bulk data                   bufferedreader bbr = new bufferedreader (comp); // opening bulk file                   while (!done) {  // flag break second file operation if matching value found                     while ((q = bbr.readline()) != null) {  // loop read bulk file                          string delim2 = "[\\t]";                          string[] token2 = q.split(delim2); // splitting file based on delimiter                         long acno1 = long.parselong(token2[5]);                         long si1 = long.parselong(token2[31]);                          if (acno1.equals(acno)) {  // checking condition                              out.write(q + eol); // writing matching entry(entire row) input2.txt                             done = true;  // changing flag value , control go input file next line                             break;  // breaking bulk reading loop , because got value per condition                         } else {  // if condition not satisfies                              out2.write(p + eol);  //writing entry input1.txt if not matching                             done = true;  //  flag value changing , control go input file next                         }                     }                 }             }         } {             if (in != null) in.close();             if (out != null) out.close();             if (out2 != null) out2.close();         }     } }