Answer / bombe swapnil

Invalidate()
This method makes components invalid , along with all of its
ancestor containers up to the
nearest validate root. Validate root can be any container
which doesn’t change the size when their child components
change size. This method need to call when components needs
to have new layout to be done.

Revalidate()
When we call invalidate() it doesn’t automatically calls
validate to make Components to be valid again. Revalidates
calls invalidate first and then make components valid by
calling validate method. Most swing components calls
revalidate() method when we change the size of the
components and call the repaint method.

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