Classbox/J: Controlling the Scope of Change in Java

Bergel, Alexandre; Ducasse, Stéphane; Nierstrasz, Oscar (2005). Classbox/J: Controlling the Scope of Change in Java. In: 20th annual ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications (p. 177). New York, USA: ACM Press 10.1145/1094811.1094826

[img] Text
p177-bergel.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (498kB) | Request a copy

Unanticipated changes to complex software systems can introduce anomalies such as duplicated code, suboptimal inheritance relationships and a proliferation of run-time downcasts. Refactoring to eliminate these anomalies may not be an option, at least in certain stages of software evolution. Classboxes are modules that restrict the visibility of changes to selected clients only, thereby offering more freedom in the way unanticipated changes may be implemented, and thus reducing the need for convoluted design anomalies. In this paper we demonstrate how classboxes can be implemented in statically-typed languages like Java. We also present an extended case study of Swing, a Java GUI package built on top of AWT, and we document the ensuing anomalies that Swing introduces. We show how Classbox/J, a prototype implementation of classboxes for Java, is used to provide a cleaner implementation of Swing using local refinement rather than subclassing.

Item Type:

Conference or Workshop Item (Paper)


08 Faculty of Science > Institute of Computer Science (INF)
08 Faculty of Science > Institute of Computer Science (INF) > Software Composition Group (SCG)

UniBE Contributor:

Ducasse, Stephane and Nierstrasz, Oscar Marius


000 Computer science, knowledge & systems
500 Science > 510 Mathematics




ACM Press




Manuela Bamert

Date Deposited:

30 Oct 2017 12:54

Last Modified:

05 Nov 2017 02:23

Publisher DOI:





Actions (login required)

Edit item Edit item
Provide Feedback