Thread: JTable setValueAt function got the whole row in same value

Hi, people, I used the following code to create my JTable object:

DefaultTableModel tableModel = new DefaultTableModel();
String columnNames[] = {"A", "B", "C", "D", "E"};
DefaultTableColumnModel columnModel = new DefaultTableColumnModel(); 
for (int i = 0; i < 5; i++) { 
	TableColumn column = new TableColumn(); 
	column.setHeaderValue(columnNames[i]); 
        columnModel.addColumn(column); 
	tableModel.addColumn(column);
} 
tableModel.addRow(new Object[5]);//for the first blank row
MyTable table = new MyTable(tableModel, columnModel);

MyTable class was defined below:

public class MyTable extends JTable {		
	public MyTable(TableModel dm, TableColumnModel cm) {
		super(dm, cm);
	}
 
	@Override
	public void changeSelection(int row, int column, boolean toggle, boolean extend) {
		super.changeSelection(row, column, toggle, extend);
                if (editCellAt(row, column))
                    getEditorComponent().requestFocusInWindow();
	}
 
	@Override
        /*only the first column is editable, the other columns' values are determined 
           by the corresponding first column using a query from dababase
        */
	public boolean isCellEditable(int row, int column) {
		if (column == 0) return true;
		else return false;
	}
}

then, I input "a1" to the cell(0, 0), did the query and got the resultset: a1, b1, c1, d1, e1(for example) and set the values to the table:

table.setValueAt(b1, 0, 1);
table.setValueAt(c1, 0, 2);
table.setValueAt(d1, 0, 3);
table.setValueAt(e1, 0, 4);

finally, I got a table like this:

A	B	C	D	E
e1	e1	e1	e1	e1

all the cells of this row have the same value e1, why comes out such weird thing?
Any ideas or suggestions are welcomed, thanks in advance!