From a quick look:


pw.println(filenm); // got a java.lang.NullPointerException here


You have never initialized a pw object. pw is set to null. Now you are initializing pw in...

Why use a stack? You could just loop through the string and print each char in reverse order.

But still think using the built in StringBuilder is better.


for (int i=s.length()-1;i>=0;i--) {
...

Either use a loop like others are saying or you can take the lazy way out:


String sText = "bracket";
String sReverse = new StringBuilder(sText).reverse().toString();...

I used to use the buffered reader in September but I started to find when in my contests that the Scanner is better.

Since I can read individual elements at a time, I don't have to worry about...

That's an amazing list of tutorials. :D Thanks man. :D

What do you mean?

There isn't multiple inheritance in Java. It's a single inheritance only language. :)