Thread: Chess Program

how i can perform different tasks for the different buttons in the controller class

I gave three solutions for the problem earlier.
The second and third solutions put data into the object reference passed to the ActionListener method which could get that data and from it know which button was pressed.
One used the JComponent class's ClientProperty methods: get... and put...
The other extended the JButton class with your own class which could have methods the listener method could call. Use the getSource() method to get the object reference and cast that object reference to an instance of your class that extended the JButton class. With that reference to your class you can call its methods.

okay

Now i understand it and it works. The only problem is i have to press the empty button 2 times before the pieces are set to default. the first time its some weird GUI not all the pieces are there. When i click the second time the board is set to normal(default).

Is this a common problem with a general solution and what is the solution?

No, it is not a common problem.
Try debugging with println() statements to see what the code is doing.

it works just had to add a call to the controller object and remove the current chessboardview...this.remove(chessboardview) and after that add the new one

this.remove(chessboardview) and after that add the new one

That seems like the wrong way to do it. The program should reuse the objects, not create new ones.

The only thing i have to do is, check the input from the user in the fenbar. Does it contains illegal characters make exceptions for them and print it out in the JTextArea which is in the infopanel class

Hi i have this piece of code but dont know what come characters mean..

 int row = 7;
        int col = 0;
        while (index < fen.length() && fen.charAt(index) != ' ') {
            ch = fen.charAt(index);
            if (ch == '/') {
                if (col != 8)
                    throw new IllegalArgumentException("Malformatted fen string: unexpected '/' found at index " + index);
                row--; col = 0;

what means row--;

the -- characters. does it lower variable int row = 7 by 1

what means row--;

the -- operator subtracts one from the variable. The same as row = row - 1

dont know what come characters mean..

Sorry, I don't understand what your problem is.

To check if two Strings are the same, you can use .equals(); Is there a similair methode for type char (Character) to check if two char are the same

char variables are not objects, and don't have methods. The == operator is used to compare two char variables.

thanks, another question is there a way to define how many instances of a specific object are allowed to be made.

Like there may only be one WHITE KING K object. Only 8 BLACK PAWN P objects are allowed.

a way to define how many instances of a specific object are allowed to be made.

Look at the Singleton pattern. It's an example of how to limit the number of instances of a classes that are created. The Singleton is for one, but the idea could be used for any number.

Another way would be to have a counter for each type. A Map might be useful for that: The key would be the piece name and the value would be the count of instances created.

i asked but its not necessary to define how many objects are allowed to be made.

Another question. This is the program single window with fen, board en some buttons. this represents one FEN diagram.

in the menubar there is a menu edit with menu item add diagram. Is it possible to "copy" the diagram or make a new one and paste it under the diagram which is all ready there so with a scrollbar you can switch between different diagrams. how can i add a new diagram right below the a other diagram

Is a "diagram" the GUI things that are shown in a component like a JPanel?

Have you tried adding them to a scroll pane to see what happens?

Or perhaps a CardLayout would be another way to allow viewing different "diagrams".

Or try remove() and add() to change "diagrams".

I have to program this in the controller class wright? the controller class makes the frame and the jpanel with different classes from the view which contains jpanel

Do it in the class that controls what is shown in the JFrame if that is where you want to be able to change what is shown in the JFrame.

another question.

How can i save the current diagram? All ready have some save en open code with extension cmd but how can i save the chessboard and fen to a file is in a container with borderlayout etc

writer.write(..........)

store the current diagram and fen in a variable or something?

Do you need to save more than the FEN string? It can be used to create a position.

The fen string with description! So i fill in a fen-string with description white-to-win.. that needs to be saved i think. What you suggest is to save the fen and description and when its opened the chessboard pieces move to places which the fen indicates.

But as i said earlier actually there must be a possibility to add a diagram under the current diagram, so there are more chessboards with the associated fen-notation. So i think i need to save the chessboard and fen as well

but how to do that? store it in some kind of variable?

Can each chess board can be represented by a FEN String?
If not, what is missing?

Save a FEN string for each board you want to save.

Each chessboard is associated with one FEN String, if the file has more boards it also contains more fens. so you say i have to save the FEN? what about the description

You can write many FEN strings and descriptions to a text file. It is up to you to design a file layout to handle that.

and my question is how can i design a file layout to handle that can you give code examples need to finish this deadline is tomorrow

and thanks for all you help last week! learned a lot!

design a file layout to handle that

What needs to go in the file?
One design would be to have a line/record for each board. Use a special character to separate the separate parts/fields. For example use a ;
<FEN String1>;<Description1>
<FEN String2>;<Description2>

When a line/record is read, the split() method can separate fields into the elements of an array.

Description
Fen

whats this?

<FEN String1>;<Description1>
<FEN String2>;<Description2>

Screen Shot 2013-08-15 at 10.40.19 PM.jpg

first jtextfield is description right under it jtextfield fen-notation