Java File convert tab characters to space characters

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;

public class Main {

  public static void main(String args[]) throws Exception {
    FileReader fr = new FileReader("Main.java");
    BufferedReader br = new BufferedReader(fr);

    FileWriter fw = new FileWriter("Main1.java");
    BufferedWriter bw = new BufferedWriter(fw);

    // Convert tab to space characters
    String s;/*from  www  .  ja v  a2s. co m*/
    while ((s = br.readLine()) != null) {
      for (int i = 0; i < s.length(); i++) {
        char c = s.charAt(i);
        if (c == '\t')
          c = ' ';
        bw.write(c);
      }
    }

    bw.flush();
    fr.close();
    fw.close();
    System.out.println("done");
  }
}