in Product class made public method with proper return type, and use in place of

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As a random generator use Class java.util.Random. Method nextInt(...
details in docs
java.util.Random r;
int give_me_number_0_49() {
return r.nextInt(49);
}

Show your typeof_patronJComboBox model. Post more code ... as attachment (for example). Line 9 is on the first look looks is on its way a strange.

You gave advice.

Introduce own boolean flag 'pressed' and use it to switch needed behavior

.

Your program
// s for string and c for search character
int i = 0;
int result = 0; //number of occurences
for(i = 0; i < s.length(); i++)
{
if (s.charAt(i) == c) //...

Default polynomial:
Look athttp://en.wikipedia.org/wiki/Polynomial#Classifications
The simplest polynomial is

I would like to see that Your default Polynomial() meet the minimum requirements to...

public static void main(String[] args) {
Polynomial polyAdd = new Polynomial();
System.out.println(polyAdd.toString());
}

Why it gives error, where are defaults...

Write new class
Place in it your array
Start from single char. Get result.
Later use array of char or String.
//
Alternatively you can do all work inside single static method.

write the method
in this method loop around the array, if value associated with current loop-index is equal to i-value return true...

Do not forget also the

You've written a program to count the specific character given c. This character may also be a space. How much can be different characters in your text? Each character has its representation as an...

use varibles for labels
first declare in proper place: JLabel label1;
In constructor create new instance of label: label1 = new JLabel(card1);
add this label ...
///
In method actionPerformed...

http://www.javaworkspace.com/connectdatabase/connectPostgre.do
http://jdbc.postgresql.org/download.html

Nothing to change. This form is fully acceptable.
--------
You can try CardLayout; on each tab, you can put only the necessary components labels and txtfields, and switch between tabs in accordance...

. check x on input, where x is old
. if x >=0, INPUT never occurs, then x remain forever old >= 0 value

here is! , and annunfanwen is an author

methodadds usefull spaces as separator L28,38,48,54

method don't know about it . Also can't collect digits together to form number

In addition little...

whiteyoh, look at static int ConsoleOptionGUI(String s) method http://www.daniweb.com/forums/thread231390.html
Yet you will not always write all the code in the main method.

Look at java doc java.util.Calendar and java.util.GregorianCalendar classes. Nice implemented interfaces, constructors and methods. Nice examples. Their use will reduce drastically the volume of...

System.exit(0);
comment this, it closes all windows and ends program
find another solution e.g. setting the status window on the invisible

http://fivedots.coe.psu.ac.th/~ad/jg/objm3g/index.html

Active Rendering
http://www.gamedev.net/reference/programming/features/javarender/default.asp

Thread Pools
http://www.brackeen.com/javagamebook/

Threads...

public static void main(String args[]) {
QApplication.initialize(args);
//
QFont font = new QFont();
font.setFamily("Lucida Console");
...

Summary of conversation.
I know, You want to use the package trolltech to create applications.
As a beginner java programmer you cetainly think "this is the shortest way to achieve rapid...

Learn first http://www.brpreiss.com/books/opus5/

public class CodeEditor extends QPlainTextEdit
{
public CodeEditor(QTextDocument textDocument) //textDocument as parameter in constructor
// public CodeEditor()
{
// here
...

use method (from documentation of package mentioned above)

Loading images from filesystem throws I/O error.
I think , better way (for me) is load all images in initial phase of program. For example in specialized method loadImages() , that returns array of...

On a very general question, do not expect a detailed response

The same url as peter_budo posted
http://chumbalum.swissquake.ch/files/MS3DHelp-HTML.zip

Add field in Room .
Extend the Room constructor , or write the new one, which takes into account a new parameter, image.
If you dane this, look
Each neighbor already has its own image!
//
Good...

You are working with package qtjambi. You should know it better.

first read
http://doc.trolltech.com/qtjambi-4.5.2_01/index.html...

Decide, that you need single Frame. If yes, create class MyLinkPanel extends JPanel in same way as class MyPanel.
Inside constructor MyFrame() add new instance of MyLinkPanel in same way as instance...

http://www.brpreiss.com/books/opus5/html/page264.html

public class GCD have a static method gdc. Then you do not need to create new instance of this class .
simply use long val = GDC.gdc(l1,l2);

1. to generate random index, use public int nextInt(int n) method from java.util.Random, where n is number of questions.
2. introduce int varibles counters for correct and wrong answer. Check...

L24-29 this is initialization
When you creates (in main method) new instance of ExitJoke the first executed code is L24-29. L26 here is "new ExitJoke", this executes code in L24.
Then your program...

properly write constructor
reply , what does mean parameter "String in" in contructor?
What information is transmitted to a class?

this mean

use methods to setColor green,yellow,red ;getColor