Lambda the Ultimate

An interesting project at jscience.com.

From their description:

 Let's take the following example:

        class Person {
            void setWeight(double weight);
        }

Should the weight be in pound, kilogram ??
With quantities there is no room for error:

        class Person {
            void setWeight(Quantity<Mass> weight);
        }

Not only the interface is cleaner (the weight has to be of mass type); 
but also there is no confusion on the measurement unit:

        double weightInKg = weight.doubleValue(SI.KILOGRAM);
        double weightInLb = weight.doubleValue(NonSI.POUND);

Quantities work hand-in-hand with units (also parameterized). 
For example, the following would result in compile-time error:

        double weightInGal = weight.doubleValue(NonSI.GALLON); // Compile error, Unit<Mass> required.
        

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Edit: fixed lt, gt signs

Fortress Language spec 0.866 [sin pi/3] is out!

http://research.sun.com/projects/plrg/fortress0866.pdf