I'm currently writing a BMI calculator and I have problems with the
DecimalFormat.
//if calculate is pressed
        if(c.equals("b"))

Is there an easy way to completely copy a class?  say I have;
FOO A;
FOO B;
and I do:

i want to make a little image follow the mouse in applet.what is the best
way to do that....i draw image in the place of a coursor, but as it moves
new images are created.how to erase the old ones?.....i;m beginer in java.
thank you

When I go to the web site e.g.
http://java.sun.com/j2ee/1.4/download-dr.html
the two versions are offered for download but I found nowhere an table comparing the features
of the both releases. Could someone explain me the differences?

I was looking at replacing only a character withing a string by position,
not global replace:
http://dlt.ncsa.uiuc.edu/javadoc/grunk/ncsa/emerge/util/StringUtils.html
How shall I go about doing it?

This is not a homework problem!!
I have two classes, ClassA and ClassB.
ClassA contains main() and handles all the Swing code (sets up the frame and
text boxes etc)

hi,
I am just start learning java and i got this problem
I tried to create a class called testing and in the main file i create
2 object classes, but they are always linked togeter.

I have j2sdk for linux. I am not able to execute javac, java and
others by their names. To execute them, I need to do ./javac to
compile the program. Can't I execute them just by using their names.
regards,

I am parsing a file to retrieve some data , between the tags:
<Foundation.Extension_Mechanisms.TaggedValue.value>int:adminis
trativeState=1;
int:alarmStatus=0;

The following 3 private methods are used to set the color, radius, and
location of an object - straightforward enough! How can I use a 4th method
to reset the first three after an initial instance has been created?
 private void setColor();

I've got a problem with Lucene and hopefully somebody can help.  
I've indexed a whole html site using lucene and the htmlparser from
sourceforge.  The problem is terms that appear in the page do not
bring back pages in the search results.  For example, if I search for

how do I manipulate parameters for an applet runtime?
I mean it is easy to pass parameters in the applet tag with the param name
thing, but how can these parameters be changed runtime?e.g. due to
interaction of hte applet with the outside document, or the outside document

Is there a recommended way of implementing events?
I have a data object, that should inform my GUI whenever it's contents
changes, so that the GUI can update it's view. What is the best way of
implementing this? Should I use the listener system? I know how to add

I found that if I do not include public void main() method in class
extending Thread class, nothing can be output by it's run() method
even if .start() being called on that Thread instance. Why will that
happen ?

Say I have an abstract class A and 2 subclasses, B and C.
Classes B and C contain a static "type" field that acts as a key to allow
instances of them to be built from details in a DB. Only B and C know what
their own "type" field is to provide encapsulation.