Hello, I am trying to figure out what this means. Can anyone tell me what I
am doing wrong. I have looked at this code for over a day and I get this
msg. I must be missing the idea of constructors. I thought constructors just
initiliaze the state of an object(fields). And once ...

I'm looking for examples of image morphology, specifically dilation.
I've been looking at several sites with examples, but I can't really
figure out how to exactly fill in the arguments of e.g. the create()
method. Any help will be appreciated.

I've made a piece of code for dilation image morphology. This is a
method being called from the main class. It compiles ok, but it goes
wrong with a NullPointerException at (x):
    private PlanarImage pi_src, pi_best;

I am trying to construct a SportsItem class( with the variables below)
keep getting illegal errors. Where am i going wrong?
public class sportsItem
{

BigInteger d;
  int f = 256;
  BigInteger g = 101;
  BigInteger st = TWO.pow(f);

I am getting this error:
java.lang.ClassCastException: java.lang.Integer
for this snippet
======================================================

The background is that i have JAR files stored as BLOBs in a database
table, and i need to load classes from these JAR files.
I understand that the easiest way out would be to write the JAR files
on to a file system, and then use the URLClassLoader to load the

Miller_Rabin.java:24: unreported exception java.io.IOException; must be
caught or declared to be thrown
  String t = stdin.readLine();
I'm not sure how to fix this error. someone please help. I have a line

Miller_Rabin.java:24: unreported exception java.io.IOException; must be

For the purposes of doing a demonstration, and since Access is the DB
that we have in the class I am teaching in, I am trying to connect JSP
with MS Access.  It is very difficult to find any examples that do
this.  As  a matter of fact, I am having trouble finding examples of

Need help(procedures/steps) to execute
an application program using BlueJ.
I have downloaded the
BlueJTutorial.pdf, read

I am beginner learning java.  I do not know whether this is appropriate
group. If not can anybody suggest approporiate group. thanks and regards

I need to create a box class that will create three types of boxes, with 0, 1,
or 3 parameters.  I have written some code but I don't understand what is
meant by 0, 1, or 3, parameters. I am having problems writing the
constructors for the parameters because I don't understand what ...

Java seems to have a problem with if conditions that take up more than one
line.
What do you do if you have an if condition that does take more than one
line?

I am a newbie to Java programming.
I have a question regarding TCP/IP socket programming.
When a client connects to a server it needs to know the server address
and its port no (lets call this portA).