JTable ToolTip with MouseCursor

Hi,
i use a JTable to display some data (strings). But some of the strings i want to display are to long for the fields in the JTable. So parts of my string arent displayed.
When the user moves the mouse-cursor over the field i want do display the complete string in the field via ToolTip.
My Problem is that i dont know the event and that i dont know how to find out on which field the mouse-cursor is.
regards
Toni

http://javaalmanac.com/egs/javax.swing.table/Tips.html?l=rel

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JTable ToolTip with MouseCursor

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