How to show popup message in jpanel when mouse is moved over some area

i have made a bar graph for my database in jpanel. now i want to show the proper data in popup when user moves mouse over apprpriate bar in jpanel. i would like to know is there is any way to do this. i need help as i m new in the field of java. i am making birthday remainder service for user. i am using j2se.

i want to show the proper data in popup when user moves mouse over apprpriate bar Sounds like you want to use a tooltip. Is your "bar"
a) a real component ?
If so, then just use setToolTipText(...) method
b) a graphical drawing?
Then you will need to convert the mouse coordinates and display a tool tip based on the coordinats. The SwingSet example that comes with the JDK has an example of this:
change to directory: j2sdk1.4.2\demo\jfc\SwingSet2
then execute >java -jar SwingSet2.jar

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How to show popup message in jpanel when mouse is moved over some area

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