public class FileInputStreamDemo {
 public static void main(String args[])throws IOException{
  String dir="C:/Documents and Settings";
  File file=new File(dir);
  if(file.exists()){
   FileInputStream f=new FileInputStream(file);
   DataInputStream in = new DataInputStream(f
     );
   int fsize=f.available();
   System.out.println("Total available bytes:"+fsize);
   int n=fsize/40;
   System.out.println("Reading first "+n+" bytes one at a time");
   for(int i=0;i<n;i++){
    System.out.println((char)f.read());
   }
   int temp=f.available()-n;
   System.out.println("\nstill available:"+temp);
   System.out.println("reading rhe next "+n+" bytes");
   byte []b=new byte[n];
   if(in.read(b)!=n){
    System.err.println("can't read"+n+"bytes");
   }
   System.out.println(new String(b,0,n));
   fsize=f.available();
   System.out.println("\nstill available:"+fsize);
   System.out.println("skiping half of remaining bytes");
   f.skip(fsize/2);
   System.out.println("\nstill available:"+fsize);
   System.out.println("reading  "+n/2+" into the end of array");
   if(in.read(b,n/2,n/2)!=n/2){
    System.err.println("couldn't read"+n/2+"bytes");
   }
   System.out.println(new String(b,0,b.length));
   System.out.println("\nstill available:"+f.available());
  }else{
   System.out.println("Directory "+dir+" is not exist!");
  }
  
 }
}