recursion instead multi-loops

i wish slight work any given array arguments, i formula generation(with lot dizzy code), finished recursion? how? i know recursion, nonetheless i dont know this.

private stationary vacant allcombinations(list<string>... lists) {
    (lists.length == 3) {
        (string s3 : lists[0]) {
            (string s1 : lists[1]) {
                (string s2 : lists[2]) {
                    system.out.println(s1 + "-" + s2 + "-" + s3);
                }
            }
        }
    }
    (lists.length == 2) {
        (string s3 : lists[0]) {
            (string s1 : lists[1]) {
                    system.out.println(s1 + "-" + s3);
            }
        }
    }
}