public class Permutation { private int [] array = {1,2,3,4,5,6,7}; public Permutation(int[] array) { this.array = array; } public void setArray(int []array) { this. array = array; } public void swap(int i, int j) { int tmp = array[i]; array[i] = array[j]; array[j] = tmp; } public void permutate(int left, int right) { if (left == right) { Utils.printArray(array); } else { for (int i = left; i <= right; i++) { swap(left, i); permutate(left + 1, right); swap(left, i); } } } public void printPermutate(){ permutate(0, array.length - 1); } }