import java.io.*;

 import java.util.*;

 public class filerw {

     public static void main(String []args) throws IOException {

         String pathname = "in.txt";

         FileReader reader = new FileReader(pathname);

         BufferedReader br = new BufferedReader(reader);

         String tmpString;

         while( (tmpString = br.readLine())!= null) {

             System.out.println(tmpString);

         }

         File file = new File("out.txt");

         FileWriter fw = new FileWriter(file.getName(),true);

         String data = " This is a test";

         fw.write(data);

         fw.close();

         FileWriter fw1 = new FileWriter(file);

         BufferedWriter bw = new BufferedWriter(fw1);

         bw.write(data);

         bw.close();

     }

 }