Size of the JtextField

Hi All
I rendered a jpanel for one column of jtable. In that Jpanel i placed a JtextField . The problem is when I click that JtextField the size of the Jtextfield incress up to the size of the jtable cell.
Please help me

This is the Editor class
public class PanelEditor extends AbstractCellEditor
implements TableCellEditor {
/** Creates a new instance of PanelEditor */
private JPanel panel;
protected JTextField tf;
String txt;
private double total;
private com.clx.client.gui.order.CatalogView catalogView;
public PanelEditor() {
public Object getCellEditorValue() {
return tf.getText();
//Implement the one method defined by TableCellEditor.
public Component getTableCellEditorComponent(javax.swing.JTable table, Object value,
boolean isSelected, int row, int column) {
tf.setBounds(10, 10, 20, 20);
// tf.setSize(33,33);
System.out.println(tf.getWidth());
tf.setSize(33,33);
txt = value.toString();
tf.setText(txt);
return tf;
}

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