A HelloGoodbye program generates two windows, like this:

After the user closes the smaller window by clicking its X, the outer window displays “Goodbye, World!”, like this:

The setOnHiding method is similar to the setOnAction method in that it registers an event handler with a node in a scene graph. In the following skeleton code, replace Insert setOnHiding method call here with a call to setOnHiding, and in that call, use a lambda expression for setOnHiding’s argument.

Hello, World! X