Java Swing accordion in Nimbus look and feel

Question

While I was reading Oracle Swing documentation, I came across this example of a set of components displaying the Nimbus Look and Feel named `SwingSet3`. I'm new to Swing. Can someone tell me if the accordion in the sidebar is a Swing component or not?

Accepted Answer

It is not a standard swing component.

You can have a look at the source code for the SwingSet3 demo here. The component on the left is a composite component made out of various other components such as `JPanel`, `JLabel` and `JButton`. There is a custom `com.sun.swingset3.utilities.CollapsiblePanel` too.

Java Swing accordion in Nimbus look and feel

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