Printing Out String Out Of Index?

I am writing a Java permutation program, it takes in N and k and gives k amount of combinations based on N length.

That portion works, but the portion I have that does not work is when k is greater then 1, the array is then then printing strings out of index.

The perm algorithm ends on index - 1 for moving characters but then I push all those characters into an Array List, I would think I could print them off however I want from there but that is not the case. I'll include the minimum amount of code possible.

//permString = 1234 or something, it doesn't matter
//Use Case N = 4 k = 3, prints out 123,124,132,134 ect
//Use Case N = 4 k = 2, error index out of range but only on the printing function; the perm function doesn't take k and
//is based on length
//the "" is just an empty string
permNow("", permString);
}

[code].....