How to clear contents of a jTable ?

Question

I have a jTable and it's got a table model defined like this:

javax.swing.table.TableModel dataModel = 
     new javax.swing.table.DefaultTableModel(data, columns);
tblCompounds.setModel(dataModel);

Does anyone know how I can clear its contents ? Just so it returns to an empty table ?

score 32 · Accepted Answer · edited Oct 07 '10 at 16:00

32

Easiest way:

//private TableModel dataModel;
private DefaultTableModel dataModel;


void setModel() {
  Vector data = makeData();
  Vector columns = makeColumns();
  dataModel = new DefaultTableModel(data, columns);
  table.setModel(dataModel);
}

void reset() {
  dataModel.setRowCount(0);
}

i.e. your reset method tell the model to have 0 rows of data The model will fire the appropriate data change events to the table which will rebuild itself.

edited Oct 07 '10 at 16:00

camickr

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answered Oct 07 '10 at 08:49

locka

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+1, (with a slight change), the TableModel interface does not have a setRowCount() method. That method is found in the DefaultTableModel class. I edited your sample code to use the DefaultTableModel, not the TableModel. – camickr Oct 07 '10 at 16:10
-100 This is not the correct answer if I understood the question. In this question the most times we mean and we want to empty cells in the table and ΝΟΤ to have a TABLE WITHOUT CELLS! Follow the answer of @Gebreigziabher Abadi below as the most correct, but changing the `dm.setValueAt("", i, j);` with `dm.setValueAt(null, i, j);` – Universe Nov 05 '14 at 14:53

score 12 · Answer 2 · edited Aug 05 '19 at 10:32

12

If you mean to remove the content but its cells remain intact, then:

public static void clearTable(final JTable table) {
   for (int i = 0; i < table.getRowCount(); i++) {
      for(int j = 0; j < table.getColumnCount(); j++) {
          table.setValueAt("", i, j);
      }
   }
}

OK, if you mean to remove all the cells but maintain its headers:

public static void deleteAllRows(final DefaultTableModel model) {
    for( int i = model.getRowCount() - 1; i >= 0; i-- ) {
        model.removeRow(i);
    }
}

edited Aug 05 '19 at 10:32

answered Oct 07 '10 at 07:51

eee

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Sorry, i want to return the table to a state where its just got the column headers but no data in it – tom Oct 07 '10 at 08:00
(virtual) -1 for the second part: as long as you know that the type of the model is DefaultTableModel, the correct method to call is setRowCount(0). – kleopatra Sep 11 '12 at 12:32

score 4 · Answer 3 · edited Aug 03 '15 at 13:45

4

    //To clear the Contents of Java JTable

    DefaultTableModel dm = (DefaultTableModel) JTable1.getModel();

    for (int i = 0; i < dm.getRowCount(); i++) {
        for (int j = 0; j < dm.getColumnCount(); j++) {
            dm.setValueAt("", i, j);
        }
    }

edited Aug 03 '15 at 13:45

rom_j

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answered Dec 25 '13 at 13:07

Gebreigziabher Abadi

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judging by the fact that the OP accepted an answer that _removed all rows_ emptying the _cell content_ doesn't seem what s/he wanted to achieve :-) And if that were the goal, setting the content to an empty string is not emptying it and might blow up in your face (if the model expects another type): so better null the content. – kleopatra Dec 25 '13 at 13:16

score 2 · Answer 4 · edited Aug 03 '15 at 14:43

2

You have a couple of options:

Create a new DefaultTableModel(), but remember to re-attach any listeners.
Iterate over the model.removeRow(index) to remove.
Define your own model that wraps a List/Set and expose the clear method.

edited Aug 03 '15 at 14:43

Nagabhushana G M

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answered Oct 07 '10 at 08:04

willcodejavaforfood

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DefaultTableModel _has_ a clear method - just named differently :-) – kleopatra Sep 11 '12 at 12:33

score 0 · Answer 5 · answered Feb 08 '15 at 07:53

I think you meant that you want to clear all the cells in the jTable and make it just like a new blank jTable. For an example, if your table contains 40 raws, you can do following.

DefaultTableModel model = (DefaultTableModel)this.jTable.getModel();
model.setRowCount(0);
model.setRowCount(40);

score 0 · Answer 6 · answered Mar 21 '18 at 18:47

0

One of the trivial methods is to use the following option.

dataModel.setRowCount(0);

dataModel is the model which you would like clear the content on

However, it is not optiomal solution.

answered Mar 21 '18 at 18:47

Farruh Habibullaev

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score -1 · Answer 7 · answered May 21 '12 at 14:42

-1

Another easy answer:

defaultTableModel.getDataVector().removeAllElements();

answered May 21 '12 at 14:42

james.garriss

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no, that's completely wrong: never-ever change the data under the feet of the model, instead use model api – kleopatra Sep 11 '12 at 12:30

How to clear contents of a jTable ?

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