how to set row or cell tooltip ?

how to set row or cell tooltip ?

I found how to set column's tooltip.

// set column header tooltip
obj.setColumnProperty("tooltip", function(i){return "Tooltip for column " + i});

but I didn't find how to set row or cell 's tooltip.

//obj.setRowProperty("tooltip", function(i){return "tooltip"});
or
//obj.setDataProperty("tooltip", function(i){return "tooltip"});
or
// obj.defineDataProperty("tooltip", function(i){return "tooltip"});

can't work.

how to ? thanks.

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;
}

over ride this function in jtable

lol, its not java code, its javascript.
weird guy lol.