Copyright (c) SEMM NL All rights reserved.
Author : Paul Hamaker. Part of JavaLessons.com

Essential

3 components will be disabled the first time .

Next click the components are made invisible, but they still exist .

Restored at the next click .

We request the contentpane's appearance to be updated, where needed.

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setState and setVisible are inherited methods, inherited from java.awt.Component.

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We need a JComponent reference to be able to call revalidate.

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