How can I delete the column and its underlying data without hiding it in jtable

Question

I am having difficulties with deleting the actual data under a particular column which I am trying to delete. I actually want to delete the column and its underlying data. I am able to insert new columns but when I delete and insert again, the old columns which I previously deleted pop up again.

Any sort help is appreciated.

Thank you in advancce.

Possible duplicate of [How to hide a particlar column in DefaultTableModel from displaying it in table?](http://stackoverflow.com/questions/12195973/how-to-hide-a-particlar-column-in-defaulttablemodel-from-displaying-it-in-table) — trashgod, Sep 06 '12 at 18:43

score 2 · Answer 1 · answered Sep 06 '12 at 18:41

2

The data is stored in the TableModel.

Deleting the column from the ColumnModel will only prevent the view (the JTable) from showing it.

In order to remove it, you need to tell the TableModel to remove the column data as well.

Depending on you implementation, you could use JTable.setValueAt(value, row, column) or TableModel.setValueAt(value, row, column), which ever is more convenient.

This of course assumes you've implemented the setValueAt method

answered Sep 06 '12 at 18:41

MadProgrammer

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right there no reason to delete Column, use setValueAt() instead – mKorbel Sep 06 '12 at 18:50
Thank you for your answers guys, I managed to delete the underlying data by using the following as I did not implement the setValueAt method. Sorry for not responding early soon as I got the answer confirming that I managed to find it. – Raymond Nakampe Sep 09 '12 at 19:15
I will try out your answers as well to make my programme short. – Raymond Nakampe Sep 09 '12 at 19:19

score 0 · Answer 2 · answered Sep 09 '12 at 19:19

public void removeColumnAndData(JTable table, int vColIndex) { MyTableModel model = (MyTableModel)table.getModel();

     TableColumn col =table.getColumnModel().getColumn(vColIndex);
     int columnModelIndex = col.getModelIndex();
     Vector data = model.getDataVector();
     Vector colIds = model.getColumnIdentifiers();

  // Remove the column from the table
     table.removeColumn(col);

  // Remove the column header from the table model
     colIds.removeElementAt(columnModelIndex);

  // Remove the column data
     for (int r=0; r<data.size(); r++) {
        Vector row = (Vector)data.get(r);
        row.removeElementAt(columnModelIndex);
     }
     model.setDataVector(data, colIds);

  // Correct the model indices in the TableColumn objects
  // by decrementing those indices that follow the deleted column
     Enumeration<TableColumn> enum1 = table.getColumnModel().getColumns();
     for (; enum1.hasMoreElements(); ) {
        TableColumn c = (TableColumn)enum1.nextElement();
        if (c.getModelIndex() >= columnModelIndex) {
           c.setModelIndex(c.getModelIndex()-1);
        }
     }
     model.fireTableStructureChanged();
  }

/*MyDefaultTableModel class**/

   class MyTableModel extends DefaultTableModel
  {
     String columns[];
     int size;

      public MyTableModel(String col[],int size)
     {
        super(col,size);
        columns = col;
        this.size=size;
     }

      public Vector getColumnIdentifiers()
     {
        return columnIdentifiers;
     }
  }

How can I delete the column and its underlying data without hiding it in jtable

2 Answers2