Calculating permutations using a Java annotation

Question

I'm interested in calculating permutations for parameters for something like this:

public class Movie() {

   @Selection(minimum=1,maximum=10)
   public Integer setLength() {}

   @Selection(minimum=1.1,maximum=5.5)
   public Double setCost() {}

}

So I can write something like List getPermutations(); so that I could get a list of every movie possible. I'm interested in supporting multiple data types.

Can anyone point me in the correct direction to take on building the annotation and List getPermutations() method?

Answer 1

这是Donald Knuth解决方案在C＃中的一个实现，可能很容易移植。