Flow Java

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Flow Java is a conservative extension to the Java programming language. It integrates single assignment variables and logic variables, to Java. Its development was influenced by Mozart/Oz. Conceptually, the extension is similar to adding immutable futures but goes beyond that by incorporating equivalence groups.

[edit] single

Syntactically, the extension adds few new tokens ^{[1] [2]}...

single Object s;

...which introduces a single assignment variable, and...

s @= new Object();

...which binds s to a new object. Or...

Object o = new Object;
s @= o;

...which binds s to o. This makes s equivalent to o.

[edit] References

1. ↑ Colloquium on Implementation of Constraint and Logic Programming Systems (CICLOPS) (2004). "Implementation Strategies for Single Assignment Variables". http://www.sics.se/~frej/flow_java/DrejhammarSchulte_CICLOPS_2004.pdf. 
2. ↑ Proceedings of the Nineteenth International Conference on Logic Programming (2003). "Flow Java: Declarative Concurrency for Java". http://www.sics.se/~frej/flow_java/flow_java_iclp03.pdf.