Help with checking JButton positions please

**sim18** · December 3rd, 2012, 09:23 AM

Thanks for the reply

when I do:

JButton[][]

I still get the same 'Source' as I do for the button clicked even though it should be the left button of the button I just clicked?

**Norm** · December 3rd, 2012, 10:17 AM

What is the index into the button array for the clicked button?
Say it was 4,5. Then the button on the same row (4) and two columns to the right would be at column 7
Then the array element: button[4][7] would return a reference to the button 2 col to the right.

**sim18** · December 3rd, 2012, 10:54 AM

I get that, but I'm not sure how to actually retrieve the source for the button?

When I create the buttons in the array I give each row/col a reference and then i give each row/col +1 & -1 to get the clicked buttons, right button, left button, above button and below buttons references.

Thanks again for your help

**Norm** · December 3rd, 2012, 11:03 AM

how do I convert these row/col to get the source ?

I posted an example in post#27

button[4][7] would return a reference to the button 2 col to the right.

Compute the indexes and use them to index into the button array.

**sim18** · December 3rd, 2012, 05:33 PM

When I try and index it into the array :
____________________________________ edit:

and when I do System.out.println on leftbtn its output is: [[Ljavax.swing.JButton;@208ee9c9

Is there a way to getSource from that?

**Norm** · December 3rd, 2012, 05:57 PM

button[button1rowLeft][button1column];
refers to a JButton object, not to an array of JButtons.
Try this:

JButton leftbtn = button[button1rowLeft][button1column];

**sim18** · December 3rd, 2012, 06:02 PM

Originally Posted by Norm

Try this:

JButton leftbtn = button[button1rowLeft][button1column];

That still comes up with the error 'array required. but java.swing.JButton found' ?

**Norm** · December 3rd, 2012, 06:35 PM

Please post the full text of the error message and the source code where the error happens.

**sim18** · December 3rd, 2012, 06:45 PM

"Array required, but javax.swing.JButton found

You are using syntax here that suggests that you are trying to access an array element. The variable you refer to is not an array,though"

**Norm** · December 3rd, 2012, 06:57 PM

Please post the FULL text of the error message that shows where the error happened and the source line with the error.
Here is a sample:

TestSorts.java:138: cannot find symbol
symbol  : variable var
location: class TestSorts
         var = 2;
         ^

**sim18** · December 3rd, 2012, 07:09 PM

I'm not sure what you mean, I am using eclipse and when I try and run the program it just says :

Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problem:
The type of the expression must be an array type but it resolved to JButton

at MyDrawingPanel$MyActionListener.actionPerformed(Ar ray.java:220)
at javax.swing.AbstractButton.fireActionPerformed(Unk nown Source)

It is line 220

**Norm** · December 3rd, 2012, 07:45 PM

Where on the line with the error does the IDE put the indicator flag that points to the location of the error on the line? See the ^ in post #35. It's beneath where there error is: var
Where does the IDE point for the error it gives you?

**sim18** · December 4th, 2012, 02:21 AM

Sorry about the long reply,

JButton leftbtn = button[button1rowLeft][button1column];

[button1column]
^

it gives me an error on that line specifically [button1column]

**sim18** · December 4th, 2012, 06:18 AM

I'm really struggling on this, I need to get this done by today and it is this one tiny bit that I need to do to complete my program

**Norm** · December 4th, 2012, 08:03 AM

The error message could mean that the array only has one dimension not two.
Check that the definition for the array you are trying to use has 2 dimensions.

**Norm** · December 4th, 2012, 08:03 AM

The error message could mean that the array only has one dimension not two.
Check that the definition for the array you are trying to use has 2 dimensions.

**sim18** · December 4th, 2012, 08:21 AM

yes it is deffinatly a 2D array because I used :

JButton[][] button = new JButton[8][8]; //Sets new JButtons

**Norm** · December 4th, 2012, 08:26 AM

You are not using that definition of button which is local to the constructor. Look for the definition of button that you are using.

**sim18** · December 4th, 2012, 08:27 AM

What do you mean definition of button sorry?

**Norm** · December 4th, 2012, 08:31 AM

Where is the variable: button defined?

Every variable in a program must be defined before it can be used. Some variable definitions:
Object obj;
int anInt;
double aDbl;

**sim18** · December 4th, 2012, 08:37 AM

Yes that was my problem thank you

public static JButton[][] button; -> I had to change it to [] []

Now

JButton leftbtn = button[button1rowLeft][button1column];

works, but now, my leftbtn has something say [3,3]

How then can I get the source for this?

**Norm** · December 4th, 2012, 08:41 AM

then can I get the source for this?

Please explain. What do you mean by "source"?

**sim18** · December 4th, 2012, 09:01 AM

I am basically trying to act like I clicked on that button to easily get the information about it, as this code gives me a null pointer exception

I really hope I am explaining properly :/ I have no other way to explain sorry

**Norm** · December 4th, 2012, 09:05 AM

know if the button has an image or not,

Get a reference to the JButton object and call its methods to determine its state.
This statement sets leftbtn to the button object:

JButton leftbtn = buttons[button1rowLeft][button1column];

Then you can use leftbtn to call the methods for the object and determine its state.

code gives me a null pointer exception

Where does the code assign any values to the array that was being accessed?

What did you do when you changed the code shown in post#46?
What did you do with the local definition for button that I talked about in post #43?

**sim18** · December 4th, 2012, 09:08 AM

To call the method would that be :

int leftHole = (Integer) leftbtn.getClientProperty("ImageIcon");

Because that still doesn't work, what method would you suggest?

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