Heaveno (Not Hello),
How do I make sure a number is a TRUE Integer or TRUE Double?
i.e
Integer integer = new Integer("1"); // TRUE

I have a few related classes which throw a DataException from the
constructor if the data passed is invalid.  I can't exactly say that the
data validation is exactly the same for these classes, but they're
similar.  Basically, count the number of String[] elements, try to parse

Could a kind Java code expert take a look at a method for me?
It seems that once called, the method starts out good by
creating/opening up a file (appending existing files).  It hiccups
when it gets to the do loop.  It asks the first question, then without

I have a new Vista Home machine.  I'm having problems with both jedit
and NetBeans - in jedit, the plugin manager times out when trying to
download plugins (although it can get a list of available plugins
okay) and netbeans seems to time out when updating the list of ruby

hi iam sujith , completed b.tech information technology . at present
working for a small company.
i am there working on java.
will it be a good decision to take scjp for getting break in a good

I am using a class called session that contains a has an internal
state object. However I can only do get on the state.
This is the code I need to test but since I cannot set the sate since
Session is an external interface with an innner class called State. Is

I am using a graphic intensive applet for airfoil modeling data called
JavaFoil. It is a form of finite element analysis, then graphs the
results (very slick!).The applet runs prefectly just once, every time
it is opened, then give totally erroneous bogus data sets (all zeros)

is there a way to read local message queues from within a Java
application?
I have got a C++-application (on Solaris 10) generating a message
queue which has to be read out by a Java program. I have read about

When I run my program the first time, the cookie must be a null.
So, for the following statement, why I will get null pointer exception at
runtime? How can I fix it?
if(cookie.getValue()!=null){

My total exposure to web delivered Java is Applets.  What is the current
Java technology that you would use to create an interactive website that
requires a database to manage data on the server end?  I'm looking for
the simplest technology to do this.  The web server that I am ...

i just download  lucene .but how to use it.

The scanFile method returns a List.  Sometimes, however, I want it to
return a Set.  When I change the return type to Collection I get an error:
a00720398/data/BedAndBreakfast.java:33: incompatible types
found   : java.util.Collection<a00720398.data.Guest>

We have the following method that we need to test ( see code snippet).
I know about junit ( using 4 here) and Jmock, but all hints are
welcome.
How can I write a test that excerises createNewHome

Let say, I have 2 input parameters in the form. If I need an extra parameter
(e.g the name of the form or any other thing) to be sent to the servlet,
what should I do?
<form name="form1" value="form1" method="post">

As far as I know I have to set this environment variable to the ".....\jvm.dll".
Is this correct?
For what purpose is this ENV Var?
Why do most of the java programs work altough I did NOT set this env variable ?