You can view a database structure in the standard ERD (Entity Relation Diagram) form. Diagrams are available for all tables and schemas (databases). The ER diagram for a table shows the table itself ...

java.lang └── Object (root of all classes) java.util ├── Iterable<E> // Java 1.5 — super interface for Collection │ └── Collection<E> // Java 1.2 │ ├── List<E> │ │ ├── ArrayList<E> │ │ ├── ...