Reading some things and found ExtendJ, very nice tool. There is actually a paper [2].

Multiplicities: the idea programing with one object the same way you deal with many.


Developed by Jesper Öqvist and other students, they implemented a series of extentions on Java. For example the Spread method. You do one thing the same way you do the many objects.

For them to do this, they implemented the @any operator.
Example of making several people work at the same time!

   People A = new People(“A”)

   People B = new People(“B”)



                          status = A.status();


In this case status is equals to working!! AMAZING! But ExtendJ is more power and helps to build extentions to Java code, for example Data Flow analysis and other mechanisms above – extending – Java, basically providing hook points so you can attach your extentions, i.e. extention points.
The original website is this [3] and the source here is [4].


 author = {\"{O}qvist, Jesper},
 title = {ExtendJ: Extensible Java Compiler},
 booktitle = {Conference Companion of the 2Nd International Conference on Art, Science, and Engineering of Programming},
 series = {Programming\&\#39;18 Companion},
 year = {2018},
 isbn = {978-1-4503-5513-1},
 location = {Nice, France},
 pages = {234--235},
 numpages = {2},
 url = {http://doi.acm.org/10.1145/3191697.3213798},
 doi = {10.1145/3191697.3213798},
 acmid = {3213798},
 publisher = {ACM},
 address = {New York, NY, USA},
 keywords = {Compiler Generators, Extensible Compilers, Reference Attribute Grammars},


[1] https://www.youtube.com/watch?v=jP76MF59mgo

[2] ExtendJ: extensible Java compiler

[3] https://extendj.org/getting_started.html

[4] https://bitbucket.org/extendj/extendj

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