JAVA file operation

 FileInputStream fstream = new FileInputStream("allUpper.seq");
 DataInputStream in = new DataInputStream(fstream);
  BufferedReader br = new BufferedReader(new InputStreamReader(in));

BufferedWriter out = new BufferedWriter(new FileWriter("kMer.txt")); // for write

while ((seqLine = br.readLine()) != null) {
               out.write(seqLine);
               out.write("\n");
  }
br.close();
 in.close();
 fstream.close();
  out.close();