J++ is a programming language that was developed by Microsoft in the early 1990s. It was designed to be an extension of the Java programming language, and as such, it shares many syntax similarities with Java. However, J++ also includes a number of features that are not found in Java, such as support for multiple inheritance and operator overloading.
Despite its potential, J++ never became very popular, and Microsoft eventually stopped supporting it in 2001. Nevertheless, it remains an interesting relic of the early days of Java development.