Here i wrote small code  to test the different between equals and "=="
public class TestString {
    public static void main(String[] args){
        String s = "Hello World";

I'm currently trying to configure Tomcat to only allow a user to log
in once.  If the same user tries to log in when already logged in
(from another machine for example) I want to cancel the login request
and present an explanation to the user.  I'm using the FORM based

You java gurus probably hate it when a posting starts like this, but
here goes anyway. Sorry, in advance!
Disclaimer: I'm not a java guru. I know how to spell it and I've
written some basic OO stuff. I now have a real problem that I'm trying

I have OMNIKEY CardMan 3121 Smart Card Reader and a few certificates
on card. I'm using it to sing and encrypt files. I would like to
automate whole process and write an application that will use this SC
Reader. I've found a lot of articles about JavaCard but not much about

I have a strange requirement herem, not sure if I can explain it properly,
but let me try - I need to display different set of sites with dyamic paths
such as -
http://xyz.com/people/1234/index.do?someparams=pqr

For example: (A simple case that Two objects with parent-child
relationship => 1 order has N order_allocs)
Orderes
========

I am having some real problems loading images in my application. I am
trying to load an imange into an application so i can implement an
algorithm  i have writen, but when i load the image and then request
the size of it i get -1, which would indicate the image  has loaded

I am using jdk1.5 Kit for application development. I am using AWT for
gui interface making. Can you please guide me, how I can define
shortcut of menu like Alt+F?
I tried below statement for define shortcut of menu but it works on

Let's say I have a struts action at http://xyz.com/someAction.do and this
URL is referred from one IFRAME via "src" attribute of IFRAME. Is it
possible for me to detect inside someAction.do which page is embedding it in
an IFRAME? How can I do this?

I am using jdk1.5 kit for development. I developed a JFrame window
which has JTable in view. JTable columns and rows created using Custom
"TableModel" with the name of "InfoTableModel" extended by
"AbstractTableModel". InfoTableModel contain list of data to be

There is any way of retrieving from the system the icons associated to
the windows explorer files? Example .rar extension has a nice book
icon, how to retrieve this icon and use it on my application or any
other file?

write a java program to remove a particular character from a string
that is given by user.

it looks like I have a strange problem.
I have a small class with several byte 'properties'
and I put a values into them from int values casting them to byte..
but for some values (like 143), casting result (with (byte)) is -113???

I have a simple java gui that I wrote which adds 3 buttons and some
text.  It seems to work, but the buttons seem like they are all
different sizes.  How to I get them to be all the same size.  I tried
setSize(), but that did not seem to work.  My code is below.

Hello, programmers.
I read an article about optimizations and the article stated that one
should NOT put source into a package well that was easy enough to do.
However, it also went on to suggest that one should remove third party