How to get  visible row  count  in JTable ?

I have one table which is added to one scroll pane. For example my table have total 1000 rows, but at a time only 20 rows should be visible to the scroll pane. And I want to scroll the rows and show only 20 at a time.When user scrolls JTable then next time he can view only 1 to 21, then 2 to 22, and so on. I want to know how to get that number which represents the visible row( in this case it is 20).So kindly help me how to get visible row count. Any help regarding this will be appriciated.
Thanks and Regards,
Sheetal

how to get visible row count.First you need to get the viewport used by the scrollpane. Then you can use methods like getViewPosition() and getViewSize() to get information about the current postition of and size of the viewport.
Then you can use the table method getRowAtPoint(). to determine the first and last visible row which can then be used to calculate the visible row count.
When user scrolls JTable then next time he can view only 1 to 21, then 2 to 22, and so onThis is the default behaviour when a "block" scroll is done.
However when you click on the arrow button on the scrollbar it will only scroll a single row. You could override the getScrollableUnitIncrement() method to return the value from the getScrollableBlockIncrement() method.
However the user can still drag the scrollbar manually which would cause a problem. So you would also need to remove the MouseMotionListeners from the scrollbar to prevent this.

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