An essential motivation behind concurrent object-oriented programming is to exploit the software reuse potential of object-oriented features in the development of concurrent systems. Early attempts to introduce concurrency to object-oriented languages uncovered interferences between object-oriented and concurrency features that limited the extent to which the benefits of object-oriented programming could be realized for developing concurrent systems. This has fostered considerable research into languages and approaches aiming at a graceful integration of object-oriented and concurrent programming. We will examine the issues underlying concurrent object-oriented programming, examine and compare how different approaches for language design address these issues. Although it is not our intention to make an exhaustive survey of concurrent object-oriented languages, we provide a broad coverage of the research in the area.
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