Source Code : Adding new row to existing Swing JTable

Adding new row to existing Swing JTable

Is there an easy(ish) way to add an additional row to an existingJTable's data?

I see that you can create a model of the table data using the
-TableModeldataModel = theTable.getModel();

ButTableModelhas no 'insertRow()' method.

I also see thatDefaultTableModelhas the insertRow() method, but I can not see a way to useDefaultTableModelwith an existing table (seems to be specific for a new table). I tried casting but you can not castTableModelas (DefaultTableModel).

Is there a simple way of doing this(something like):

TableModeldataModel = theTable.getModel();
dataModel.insertRow(X);
theTable.setModel(dataModel);

And you have the new table with end row?
Vector rowData;   
  DefaultTableModel defaultModel = new DefaultTableModel();  
  if (theTable.getRowCount()>0) {  
  for (int r=0;r  rowData = new Vector(6);  
  for (int c=0;c  rowData.add(theTable.getValueAt(r, c));  
  }  
  defaultModel.addRow(rowData);  
  }   
  }  
  defaultModel.addRow(new Object[]{"","","","","",""});  
  JTable newTable = new JTable(defaultModel);  
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  Vector rowData;   
  DefaultTableModel defaultModel = new DefaultTableModel();  
  if (theTable.getRowCount()>0) {  
  for (int r=0;r  rowData = new Vector(6);  
  for (int c=0;c  rowData.add(theTable.getValueAt(r, c));  
  }  
  defaultModel.addRow(rowData);  
  }   
  }  
  defaultModel.addRow(new Object[]{"","","","","",""});  
  JTable newTable = new JTable(defaultModel);  


But at the point of [defaultModel.addRow(rowData);] whilst debugging the 'rowData' shows it has the expected values from the existing row, when I debug the 'defaultModel' the elementData shows 'nulls'.

I don't know what you are doing. There is no need to copy the data from the exising model. Its one line of code. All you do is:

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model.addRow(...)   
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model.addRow(...)   


No need to recreate the JTable.

To increase your chances of getting help you should create a SSCCE, that demonstrates the incorrect behaviour.
 

But isn't addRow() only available to DefaultTableModel? How do I use DefaultTableModel with an existing table (that already contains data).

I need to be able to take an existing table and add a row to it, from what I can see an existing table can only use TableModel, which does not have the addRow() method.



Did you look at the model to see what the table is currently using?

If its not currently using the DefaultTableModel, then change your code when you create the table to use the DefaultTableModel.

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table = new JTable(data, ConstantValues.COLUMNS_HEADERS);  
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table = new JTable(data, ConstantValues.COLUMNS_HEADERS);  



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table = new JTable(new DefaultTableModel(data, ConstantValues.COLUMNS_HEADERS));  
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table = new JTable(new DefaultTableModel(data, ConstantValues.COLUMNS_HEADERS));  


Then changed
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DefaultTableModel defaultModel = new DefaultTableModel();  
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DefaultTableModel defaultModel = new DefaultTableModel();  


(and all that other stuff above) to:

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DefaultTableModel defaultModel = (DefaultTableModel) theTable.getModel();  
defaultModel.addRow(new Object[]{"","","","","",""});  
JTable newTable = new JTable(defaultModel);  
return newTable;  
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DefaultTableModel defaultModel = (DefaultTableModel) theTable.getModel();  
defaultModel.addRow(new Object[]{"","","","","",""});  
JTable newTable = new JTable(defaultModel);  
return newTable;  


Haven't tested it, but early debug shows what I'd expect so I think it works.