package playground;

public class Playground {

    public static void getAllPermutations(Object[] array) throws IllegalArgumentException {
        if ((array == null) || (array.length == 0)) {
            throw new IllegalArgumentException("Not defined!");
        } else {
            getAllPermutations(array, array.length);
        }
    }

    public static void getAllPermutations(Object[] array, int n) {
        if (n == 1) {
            for (int i = 0; i < array.length; i++) {
                System.out.print(array[i]);
            }
        } else {
            for (int i = 0; i < n; i++) {
                Object temp = array[n - 1];
                array[n - 1] = array[i];
                array[i] = temp;
                getAllPermutations(array, n - 1);
                temp = array[n - 1];
                array[n - 1] = array[i];
                array[i] = temp;
            }
        }
    }

    public static void main(String[] args) {
        Object[] test = new Object[3];
        for (int i = 0; i < test.length; i++) {
            test[i] = i;
        }
        getAllPermutations(test);
    }
}