How can i write a Java program to find the permutation of any two imputed numbers

Question

the two numbers are 5 and 2

Answer 1

a permutation is a specific order to a set of numbers. Iirc, given a number of unique elements, there are n! arrangements / permutations.

so with two numbers, I don't know what they represent. are they the 2 unique elements? are they a set of the same elements? are they a list of numbers from 0 to that number? Need more information.

Answer 2

the two unique element