Set Tooltip in JTable Cell

JTable tab = new javax.swing.JTable(tabm3){
public Component prepareRenderer(TableCellRenderer renderer,
int rowIndex, int vColIndex) {
Component c = super.prepareRenderer(renderer, rowIndex, vColIndex);
if (c instanceof JComponent) {
JComponent jc = (JComponent)c;

jc.setToolTipText((String)getValueAt(rowIndex, vColIndex));


}
return c;
}
};