title: Reading and writing from and to the same file in Java
body: <p>I want to read from  <code>criteria.txt</code> file, to tokenize and append at the end of the same file the tokens. The program throws an exception: <code>No file found!</code> I do not know where my mistake is. Any suggestion would help me. Thank you in advance!</p>
  
  <p>Here is my code:</p>
  
  <pre><code>import java.io.*;
  import java.util.StringTokenizer;
  
  public class Test
  {
      private FileReader fr;
      private BufferedReader br;
      private FileWriter fw;
      private BufferedWriter bw;
      private StringTokenizer strtok;
      private String s;
  
      //constructor
      public Test()  
      {
          try
          {
              fw=new FileWriter("criteria.txt", true);
              bw=new BufferedWriter(fw);
  
              try
              {
                  fr=new FileReader("criteria.txt");
                  br=new BufferedReader(fr);
  
                  while((s=br.readLine())!=null)
                  {
                      strtok=new StringTokenizer(s," ");
                      while(strtok.hasMoreTokens())
                      {
                          bw.write("\n"+strtok.nextToken());
                      }
                      br.close();
                  }
              }
              catch(FileNotFoundException e)
              {
                  System.out.println("File was not found!");
              }
              catch(IOException e)    
              {
                  System.out.println("No file found!");
              }
  
              bw.close();
          }
          catch(FileNotFoundException e)
          {
              System.out.println("Error1!");
          }
          catch(IOException e)    
          {
              System.out.println("Error2!");
          }
      }   
  
      public static void main(String[] args) 
      {
          Test t=new Test();
      }
  }
  </code></pre>