JR is a language for concurrent programming. JR is an extension of the Java programming language with additional concurrency mechanisms based on them in the language (Synchronizing Resources) programming SR. It is suitable for writing programs for both shared-memory distributed applications-and and machinery. JR Programming Language: Concurrent Programming in Java Extended, an advanced-level textbook, explaining the JR programming language and illustrates how to write a program can be used simultaneously for different applications. The source code for all examples of programs and certain parts of all programming exercises are available on the web page JR. JR Programming Language: Concurrent Programming in Java Extended is designed for upper level undergraduate and graduate students in computer science.