IMO, if you are planning to work both in embedded and server modes, Derby would be a good choice for a beginner database. It supports almost all SQL features which you might need along with support...

> How I go about getting documentantion?

Any JDBC tutorial out there should be good enough to get you started. The only difference would be the way the SQL driver is loaded. This ...

> I don't understand what you mean by type 4

http://java.sun.com/products/jdbc/driverdesc.html
http://www.javaworld.com/jw-07-2000/jw-0707-jdbc.html

Seems to be a problem with the way your query is created; what's the JDBC type of `patientNo'? Is it a VARCHAR? If yes, then you need to wrap the passed in patient number in single quotes when...

You might want to take a look at an open source browser in java called Lobo (http://lobobrowser.org/java-browser.jsp). Though it has a limited rendering capabilities when compared to browsers like...

> Why use abstract classes at all? Why not just declare a class and
> then make sure you never instantiate any variables of that type?

...because compile time checks are far superior/efficient...

You can either modify the properties of the command window [cmd] to show more than 500 lines [ALT + SPACE + P -> Screen Buffer Size -> Height] or pipe the output of your java program to some text...

Are both the class files present in the same "policy" directory? The physical directory structure which holds your .class files needs to reflect your package hierarchy. Read the sticky post at the...

I'd assume that you are having problems viewing the output of your program, yes? In that case reading this (http://java.sun.com/docs/books/tutorial/getStarted/cupojava/win32.html) might help. Also,...

> So what I need to know to be Java expert in Web and Desktop
> Applications?

Apart from the points already mentioned, I'd like to stress on reading good books/code. I've seen people churn out...

Try using the DocumentBuilderFactory instead of explicitly instantiating the parser.public static void main(String args[]) throws Exception {
DocumentBuilder builder =...

> Did not solve the problem

You sure? The same piece of code works for me. BTW, what kind of process is writing to this file of yours? Another Java process? Which JDK version are you using? I...

NumberFormat is an abstract class; use its static factory method to get your choice of number formatter.public class MainTest {

public static void main(String args[]) throws Exception {
...

Try using the RandomAccessFile in read mode.
public class MainTest {

public static void main(String args[]) throws Exception {
RandomAccessFile in = new RandomAccessFile("file.txt",...

The commas and the brackets are a part of the ArrayList class's toString() implementation. If you need your own row representation, either write your own method which does so or better yet, create a...

> So some kind of loop is needed

...which is what I have in my previous reply. Re-read my previous reply and try implementing that with the code you currently have. Just make sure you put all...

Use getValues().nextLine().equals("n") instead. The Scanner name is confusing BTW, just name it scanner instead of getValues which is more appropriate for a method name.

You are comparing a Scanner object with a String object.

The problem is with this line firstcube = static double pow(double first, double 3); which is invalid. When invoking methods, you don't need to specify the method modifiers along with their parameter...

Oh and BTW, once you are done with understanding how web services work, try splitting your logic in layers like the business[model] layer, database[persistence] layer etc. Database access from a web...

Assuming both the files have the same number of lines i.e. a salt for each string, you need to keep reading the data from your readers till the readLine() method returns null. Something like:...

> If re-direction must occur, it must be the first line of a constructor. Why?

To ensure that the parent class is completely initialized before it gets used in the child class's constructor body....

What's wrong with the getTime() method of the Date class which returns the number of milliseconds elapsed since January 1970 as long? To get the seconds, just divide by 1000.

> Why is it that even when i specify the index to go to it still returns -1 ?

It's not returning -1; the exception says that you can specifying an array index [-1 in your case] which is out of...

> is it possible to loop through the contents of two arrays to populate a
> third array with the combined content?

In my code I'm using looping through two Lists and populating a third list...

Sadly, this simple a thing becomes pretty clunky to implement when it comes to Java. A sample implementation might be something like:
class YourClass {

private static final List<String>...

You'd typically look-up the item of interest and then perform the necessary operations on it rather than setting a particular item of the ArrayList. A better implementation here would be have your...

> Does anybody know how I can append to the array

You can't. The best you can do is perform a copy-on-write if the content to be written is more than the initial capacity with which the array was...

> Thank you - my understanding of generic types is still somewhat limited.

When in doubt, always look at the standard library code which comes prepackaged with the JDK. For e.g. in this case,...

IMO, though the analysis is correct, the solution provided isn't because an Iterator over a collection of elements of type E isn't the same as an Iterator over a collection of elements of type F...

> Could that why the created it as an object?

There is absolutely no valid reason as to why a Boolean object needs to be created if one already exists and is ready to use i.e. considering that a...

> data[i][k + 1] = new Boolean(false);

Better yet; data[i][k + 1] = Boolean.FALSE. Same result, no unnecessary object creation.

> Can anyone help? help

Check if the Client class has a no-arg constructor in case you have explicitly provided a overloaded constructor. Also, looking at the error message gives an indication...

> By number of characters l mean not punctuation or a space

Look into the isLetter method of the Character class; modify your logic to increment the count only if the above method returns true.

> You don't need to do the conversion to int and back; just send the
> double in text format and parseDouble(...) at the Java end.

I don't think that would handle values like +INF, -INF and NaN...

There are many good books, blog posts and articles out there for getting started with JEE; your best bet would be the free JEE 5 tutorial (http://java.sun.com/javaee/5/docs/tutorial/doc/)hosted by...

JNI would be too low level; try something like SWIG (http://www.swig.org/)or JNA (https://jna.dev.java.net/).

> also, would this be something to do with JavaEE instead of JavaSE?

Depends on what you need to learn and where your expertise lies, but yeah, nowadays the core business functionality *is*...

> The local memory is not reconciled with the main memory

This might be because of each Thread is having a cached copy of your data; using the volatile...

AFAICT, there is no such method which does that. BTW, why would you want such a method? Why not just manipulate the source array first and then add it to the ByteBuffer?