generating Variations without repetitions / Permutations in java

Question

I have to generate all variations without repetitions made of digits 0 - 9.

Length of them could be from 1 to 10. I really don\'t know how to solve it, especially ho

Answer 1

Brief helpful permutation indexing Knowledge

Create a method that generates the correct permutation, given an index value between {0 and N! -1} for "zero indexed" or {1 and N!} for "one indexed".

Create a second method containing a "for loop" where the lower bound is 1 and the upper bound is N!. eg.. "for (i; i <= N!; i++)" for every instance of the loop call the first method, passing i as the argument.