Hello, i have a basic question as to the way of using interfaces.
Let's say that we have an interface In1.
Why is it valid to declare a variable of type In1?
Why is it valid to call an unimplemented method of the interface?

I have to develop the following project:
( 1 Client with 1 server )
ClientPLC
ServerPLC

Is there an actual way like an exit or quit command. I've looked and looked
and tried all sorts of things an nothing seems to exist at all.
Like my applet would detect java version and if that's too low, it would
quit. But there is no way to quit.

I'm still on the same program and I've cleared up many of the bugs
from before but I still have the same problem.  I CAN'T GET OUT OF
THIS LOOP!  I'm using System.in to read data from the console and I
can't find a break condition that works.  There can be NO other user

I'm building a photoblog, http://8.6.221.92:31796/photoblog/
was wondering why the forms,
http://8.6.221.92:31796/photoblog/feedback.jsp,
http://8.6.221.92:31796/photoblog/signup.jsp, take so long to submit..

I have a ANT script that execute a "reload" task on my Tomcat.
When I run my script, ANT prints the HTML page usually returned by HTML
Manager after a "reload" is performed.
If I check the message contained in this HTML page, I find "OK -

Please find below a code I found in onjava regarding a Filter which avoids
multiple submits. Basically it queues the requests and always overwrites the
last request with the current waiting request in queue. Hence even if  we
press 10 times, only first and last requests will be ...

[code]
/**
    * Trim all trailing zeros found after the decimal point of {@link
java.math.BigDecimal}

Hello, there. I have written a class Publication that represents,
let's say a book, and i want to read an xml file that contains info
about a publication and store the (attribute, value) to the above
class. When i run that simple application, terminates unexpectedly

  I am new to the Mac and am looking for a download of the
jdk 1.5.0 api.  I cannot find a tarball or zip file on the
Sun site that I can download so I can use the reference when
I am offline.

I am having this XML file
<log4j:throwable><![CDATA[Hello World]]>
</log4j:throwable>
The class to read the xml file extends DefaultHandler.

I made adjustments to my code since the last comments, it still works
not.  The second array still fills with null values.  Any thoughts,
feelings, suggestions?
import java.util.Scanner;

Firstly let me say I am a total newbie to Java :)
I am trying to get a java app (any app) to run on a pocketpc (toshiba
e800) with IBM's j9 jvm.
The GolfScoreTrackerApp (example distributed with j9 vm) runs fine,

I have a class called "Book"
package chapter03;
public class Book {
    String title = "";

I wanted to readchar() from a TXT pad, and store all the letters other
than spaces and dots and comma in a ONE dimensional array
So here is my questions:
FileInputStream fin = new FileInputStream("blah.txt");