How to decide component size to contain all data?

Hi, all
My application has some jtable and jtextarea which always contained in jscrollpane, not because what I need but because I don't have a idea to determine size for my component.
Let's say my jtable has 30 rows, I know how to control width for columns. But how can I determine the height for jtable precisely? Should I allocate 15 pixel for a row, or maybe 20? How can I use a height for all platforms including windows,linux?
It bothers me for a while, same stuff happened while I dealing with jtextarea. Do we have a guide line for this?
Thanks,
Vincent Chen

That's why you put it in a scrollpane.
Are you talking about setting the height or are you talking about knowing the height? Cuz setting it is typically non-sensical, since the # of rows tends to vary in a typical table. OF course, if you know it's X rows, you can get or set the row height in the table and just multiply by row count.

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How to decide component size to contain all data?

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