Yes it can. Take a look at the ToolTipManager class - and the static
sharedInstance() method for obtaining the tooltip manager object so that you
can make those changes. Bear in mind that this will affect *all* tooltips in
your app - if you need this behaviour change on just one or two components,
an alternative might be to try and extend JToolTip and override
JComponent.createToolTip() to return your extended class.