title: Combinations without repetitions
body: <p>First off i am super sorry that i have no code for this. That is simply because i have yet to wrap my mind around the concept.<br><br> I would like to be able to write a small java program that can take an ordered list of any number such that the list is 1 through number. Say for instance my number is 9. I would like this list to be <code>123456789</code> then i would like to create a program that creates EVERY possible combination of these 9 numbers. say for instance another combination would be <code>923456781</code>.<br><br> Im going to be honest, i have no clue as how to even approach this.</p>