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What are legacy classes?

April 26, 2017classes legacy

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What are legacy classes?

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The term legacy has a similar meaning to its everyday usage; something that is left behind from an earlier time or passed down from one’s ancestors. In Java, legacy classes are system components that we continue to work with, even though they may be deprecated, use deprecated methods or sub-optimal programming techniques, for example. Systems may use legacy classes from third party suppliers that are no longer maintained, for which no source code is available. Ideally, one would replace such legacy classes with contemporary implementations, but sometimes the extent of a system’s dependence on legacy classes makes them difficult or un-economical to replace. In this case, it is often necessary to use adapter classes that enable legacy classes to work with new programming interfaces. Actions: Follow-up, clarify or correct this answer. Submit a new question.