Conditionally retrieve rowdata into 2d array

[Redefine12]

The JTable I'm working with implements Boolean.FALSE in a column to create a checkbox. I've created the necessary TableModelListener to update the table model when a box is checked. I need to iterate through the model and retreive row data for the rows with the box checed. I've currently got a method that is attempting to store the data as a 2d array. When I print the array, all values are null. I've stepped through the code and can't find where I've gone wrong. Here's my SSCCE

	 public void  returnReportData(){
		 
		 TableModel tm2 = table.getModel();
//Get count of rows with Print Box checked (counter = z)	 
		 int z = 0; 
		 
		 for(int x = 0; x < tm2.getRowCount(); x++){
			 if(((Boolean)tm2.getValueAt(x, 0)) == true){
				  z++;				  				  
			 }
		 }
		 //Test print counter of checked items
		 //System.out.println(z);
		 		 			 
		 int nRow = tm2.getRowCount(), nCol = tm2.getColumnCount();
		 Object[][] reportData = new Object[z][54];  
		 int tRow = reportData.length, tCol = reportData[0].length;
		 System.out.println(reportData.length);
		 System.out.println(reportData[0].length);
		 //System.out.println(nCol);	 
		 
		 for (int i = 0 ; i < nRow ; i++){  
	         if(((Boolean)tm2.getValueAt(i, 0)) == true){  
	           for (int j = 0 ; j < nCol ; j++){     
	                 for (int A = 0 ; A < reportData.length ; A++){  
	                      for (int B = 0 ; B < reportData[0].length ; B++){                  
	               reportData[A][B] = tm2.getValueAt(i,j);
	                     }  
	                 }  
	             }  
	         }  
		 }
		 
		//Print array in rectangular form
		 int ROWS = reportData.length;
		 int COLS = reportData[0].length;

		 for (int L = 0; L < ROWS; L++) {
		 for (int M = 0; M < COLS; M++) {

		 System.out.print(" " + reportData[L][M]);
		 }
		 System.out.println("");
		 }
		 
		 
		 
	}

[Fubarable]

The JTable I'm working with implements Boolean.FALSE in a column to create a checkbox. I've created the necessary TableModelListener to update the table model when a box is checked.

That seems backwards to me, as I've always thought that a TableModelListener was for listening to changes in the table model's data, not for making changes to the table model's data.

I need to iterate through the model and retreive row data for the rows with the box checed. I've currently got a method that is attempting to store the data as a 2d array. When I print the array, all values are null. I've stepped through the code and can't find where I've gone wrong. Here's my SSCCE...

That's not a valid sscce. That's a code snippet that we cannot compile nor run. I believe that you'll have a better chance of getting help if you create and post an sscce-compliant example.

[Redefine12]

Forgive me, I've since read up on the actual meaning of SSCCE. Beginner mistake to post a method vice compilable code. I've resolved the loop issue with a little help. Regarding the TableModelListener, you are correct, and I was using as you indicated, I just worded my question poorly. Another beginner mistake. As far as the loop goes, to reiterate, the objective was to pick up row data from a jtable only where the checkbox at column 0 is checked. In essence, a print selection box. While not an SSCCE, below snippet encapsulates the logic I was going for as a discrete method. I hope this may be of help to someone else.:

	 public void  returnReportData(){
		 
		 TableModel tm2 = table.getModel();
//Get count of rows with Print Box checked (counter = z) to initialize the reportData Object[][] 
		 int z = 0; 		 
		 for(int x = 0; x < tm2.getRowCount(); x++){
			 if(((Boolean)tm2.getValueAt(x, 0)) == true){
				  z++;				  				  
			 }
		 }
		 		 			 
		 int nRow = tm2.getRowCount(), nCol = tm2.getColumnCount();
		 Object[][] reportData = new Object[z][54];  
		 int tRow = reportData.length, tCol = reportData[0].length;
				 
		 int index = 0;
		 for (int i = 0 ; i < nRow ; i++){
		     if(((Boolean)tm2.getValueAt(i, 0)) == true){
		         for (int j = 1 ; j < nCol ; j++){   
		              reportData[index][j] = tm2.getValueAt(i,j);  
		         }
		         ++index;
		     }
		 }
		 
		//Print array in rectangular form
		 int ROWS = reportData.length;
		 int COLS = reportData[0].length;

		 for (int L = 0; L < ROWS; L++) {
			 for (int M = 0; M < COLS; M++) {
				System.out.print(" " + reportData[L][M]);
		 }
		 System.out.println("");
		 }
		 	 
	}

[Fubarable]

Thanks for getting back to us about your problem and its solution!

[DarrylBurke]

It does rather look like you're reinventing a wheel there. Specifically, RowFilter used in conjunction with TableRowSorter.

db

[Redefine12]

Fair enough, DB. I'm only a few months into Java and am fully aware that my code isn't tip-top by any means. I've hacked away to get what I've got and am striving to help my struggling enterprise get a project completed, trying to pick up knowledge along the way. I'm willing to work hard and pay my dues to the Java gods and am truly appreciative of the help I'm getting here. "I yam what I yam" ; )

[DarrylBurke]

I wasn't trying to be critical of your efforts. I was at least a couple of years into Java (as a hobby) before I discovered that TableRowSorter also managed row filtering.

Using the JDK classes may considerably simplify your own code, making it more maintainable.

db