# Package javax.print.event

package javax.print.event
Package `javax.print.event` contains event classes and listener interfaces.

They may be used to monitor both print services (such as printers going on-line & off-line), and the progress of a specific print job.

Please note: In the `javax.print` APIs, a `null` reference parameter to methods is incorrect unless explicitly documented on the method as having a meaningful interpretation. Usage to the contrary is incorrect coding and may result in a run time exception either immediately or at some later time. `IllegalArgumentException` and `NullPointerException` are examples of typical and acceptable run time exceptions for such cases.

Since:
  1.4

- Related Packages
  Package
  Description
  javax.print
  Provides the principal classes and interfaces for the Java Print Service API.
  javax.print.attribute
  Provides classes and interfaces that describe the types of Java Print Service attributes and how they can be collected into attribute sets.
- Class
  Description
  PrintEvent
  Class `PrintEvent` is the super class of all Print Service API events.
  PrintJobAdapter
  An abstract adapter class for receiving print job events.
  PrintJobAttributeEvent
  Class `PrintJobAttributeEvent` encapsulates an event a `PrintService` reports to let the client know that one or more printing attributes for a `PrintJob` have changed.
  PrintJobAttributeListener
  Implementations of this interface are attached to a `DocPrintJob` to monitor the status of attribute changes associated with the print job.
  PrintJobEvent
  Class `PrintJobEvent` encapsulates common events a print job reports to let a listener know of progress in the processing of the `DocPrintJob`.
  PrintJobListener
  Implementations of this listener interface should be attached to a `DocPrintJob` to monitor the status of the printer job.
  PrintServiceAttributeEvent
  Class `PrintServiceAttributeEvent` encapsulates an event a Print Service instance reports to let the client know of changes in the print service state.
  PrintServiceAttributeListener
  Implementations of this listener interface are attached to a `PrintService` to monitor the status of the print service.