Node is a self-referential class with a name data field and a next link field. top is a reference variable of type Node that holds a reference to the first Node object in a singly linked list.

The number of fields is defined at construction time and cannot be changed. This increases robustness and reduces the chance of table corruptions (table columns, record’s number of fields mismatch).

In this second half of the Java persistence with JPA and Hibernate tutorial, we move past concepts and start writing code that persists data to and from a relational database using JPA with ...