Determine preferred size to be set for the JPanel attached to JScrollBar

Determine what preferred size to be set for the JPanel attached to JScrollBar.
Hello all, I am having a JPanel, where new components will be added into it during run-time. When there are too many components inside the JPanel, I need to re-set the JPanel preferred size so that the JScrollBar is scrollable.
I was wondering what is the good method to determine the preferred size of JPanel during runtime?
Currently, I am using
myJPanel.setPreferredSize(new Dimension(
numberOfNewComponent * preferred width of each component,
numberOfNewComponent * preferred height of each component
));Is there any better alternative?
Thank you very much.
yccheok

Usually a container such as JPanel will calculate its own preferred size from its layout manager - calling setPreferredSize is often unnecessary.
When you add a component to your JPanel its preferred size will change automatically.
What's wrong with the behaviour when you simply add your JPanel to a JScrollPane and let it manage its own preferred size?
Hope this helps.

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