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   | class MonTableModel extends AbstractTableModel {
 
 protected String [] columnNames = { "UserName","sessions","StartTime","EndTime"};
    protected Object[][] data = {null,null};
   // protected Object[][] data ;
 
    @Override
    public int getColumnCount() {
        return columnNames.length;
    }
 
    @Override
    public int getRowCount() {
        return data.length;
    }
 
    @Override
 
    public String getColumnName(int col) {
        return columnNames[col];
    }
 
    @Override
    public Object getValueAt(int row, int col) {
     .........
}{ | 
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