Appending data to files

FileOutputStream fos = new FileOutputStream("16.html", true);

The following example reads user input from System.in and appends it to the files specified on the command line.

import java.io.*;


public class Append {

  public static void main(String[] args) {

    FileOutputStream[] fos = new FileOutputStream[args.length];

    for (int i = 0; i < args.length; i++) {
      try {
        fos[i] = new FileOutputStream(args[i], true); 
      }
      catch (IOException e) {
        System.err.println(e); 
      }
    } // end for
    
    try {
       while (true) {
        int n = System.in.available();
        if (n > 0) {
          byte[] b = new byte[n];
          int result = System.in.read(b);
          if (result == -1) break;
          for (int i = 0; i < args.length; i++) {
            try {
              fos[i].write(b, 0, result); 
            }
            catch (IOException e) {
              System.err.println(e); 
            }
          } // end for
        } // end if   
      } // end while
    } // end try
    catch (IOException e) {
      System.err.println(e); 
    }

    for (int i = 0; i < args.length; i++) {
      try {
        fos[i].close(); 
      }
      catch (IOException e) {
        System.err.println(e); 
      }
    } // end for


  } // end main
  
}