persistence : Java Glossary
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persistence
Writing Java objects to disk in a way that they can be read back in again later. The most common mechanism is serialization.

The Properties class works for String persistence.

Sun’s Javadoc on the Properties persistence class : available:

Applets have AppletContext. setStream to allow a session to leave notes for another.

Sun’s Javadoc on AppletContext.setStream persistence : available:

There is the Preferences class for storing information in the registry or equivalent, which requires signing in Applets. Preferences store information in a very fluffy format. The registry is notoriously fragile, and is difficult to backup/restore.

Sun’s Javadoc on the Preferences persistence class : available:

For heavy duty applications you use a POD, a Persistent Object Database.

In J2EE, there in a

Sun’s documentation on javax.persistence API
that uses an XML format. It is quite complicated with entities and a query language. Hibernate is a superset of this API.
Hibernate
javax.persistence API
Junotal
POD
Preferences
serialization
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