Why we need Marker Interface, It doesn't have any methods to implement
, why we use empty interfaces, how it useful.

hi, i'm fairly new to java and am experimenting with various swing
components. as far as I know at this time, when a change occurs in the text
i want to display, in order to show it, I have to repaint the frame.
Is there a component or way of placing a textarea of sorts in a GUI and ...

how can i test if multiple threads of the same process are running, and
if found kill rest and run only one. i am finding that i am running
multiple threads and would like to kill rest except any one. any help
guys.

I'm wondering if it would be possible to write a program that actually
performs a mouseclick on a given location.
So for instance, I want to perform a mouseclick on my screen (thus on
the program that is currently fills the screen) on position 200,200.

is there any tools for creating uml class diagrames from existing java
classes ??!
if there is could you suggest me the good ones

i've a question for you.
My Jsf Application allow user to upload a txt file thanks to a Myfaces
component.
I want manipulate later this file and i know that exist getInputStream

Hi, I need the info of how to tune the performence based on data
structures used. Like Collections.
Thanks & Regards
Krishna Prasad.

can you give me some code  in java that can convert two or three digits
numbers into equivalent word descriptions such as 45=fourty five,
104=one hundred and four

I am working with a 3rd party application that provides its own
public APIs for accessing its data. Included is an implementation of
a database ResultSet. The object provides a method for getting a
BLOB:

Systems:
I am using Eclipse 2.1.3 on a Win XP platform to develop a Java 1.3.2
Stand Alone App.
The app extends JFrame that then host a set of TAB's designed to

I have a web application running under Tomcat 5.0, and I need to write
some output to a file.
This app doesn't have its servlet context hardcoded in anywhere, so I
can deploy it with any name and not worry about missing some random bit

When I try to use 'java' command to run (whatever I do, even whan I
used 'java -version') I get the following error:
exec(): 0509-036 Cannot load program java because of the following
errors:

When I build my libraries, I code to interfaces, which is clearly a
best practice.  When programmers then create classes that use my
interfaces,  they complain that the exceptions they want to throw are
not defined in my signature.  For example:

List,
Can anyone point me to best practices (web links or books) for secure
key storage and management of a private key for a symmetric encryption
system?  I have a project I am working on where I need to store the

i am implementing socket tcp/ip comm within my app.
now i am able to read data from the inputstream, however in my reads i
am sometimes missing the first character of my string, so if the
message send is Java i am receiving ava, without the first character.