public class Test6 {
    public static void main(String[] args) {
        int sum = 0;
        int[] a = { 1, 2, 3, 4 };
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                if (a[j] == a[i])
                    continue;
                for (int k = 0; k < a.length; k++) {
                    if (a[k] == a[i] || a[k] == a[j])
                        continue;
                    System.out.println(a[i] + "" + a[j] + "" + a[k]);
                    sum++;
                }
            }
        }
        System.out.println("共有" + sum + "组数");
    }

}