This example demonstrates how to exclude classes based on their type hierarchy.
More specifically, in this example the implements attribute of yGuard's
class element is used to exclude all classed that implement the
java.io.Serializable interface. (In the same way, the extends attribute of
the same element could be used to exclude classes that extend a certain base
class).
Additionally, all classes that extend the base class for menu items,
com.yworks.example.MyMenuItem, are defined as entrypoints for the shrinking
engine using the extends attribute of the class element.
The readObject and writeObject methods and the field serialVersionUID
needed for serialization are excluded from name obfuscation as well.