Java provides a hierarchy of classes that represent different kinds of exceptions. These classes are rooted in the java.lang package’s Throwable class, along with its Exception, RuntimeException ...

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.

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The next screen snapshot shows that the appropriate classes have been generated (two Java classes representing the contents described by the XSD and an ObjectFactory).