Print all possible permutations of an array elements

Question

I am working on a program,I have tried to find a way how to find all possible permutations of an array elements in Java, but it didn't work .

My code is:

public class Permutation {
    public static void main(String[] args) {
        int[] list = new int[3];
        System.out.println("enter the elements of array");
        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < list.length; i++) {
            list[i] = sc.nextInt();
        }
        System.out.println(Arrays.toString(list));
        int n = list.length;
        permutation(list, n, 0);
    }
    public static void permutation(int[] list, int n, int l) {
        if (l == n - 1) {
            printArray(n, list);
            return;
        }
        for (int i = 1; i < n; i++) {
            swap(list, list[i], list[l]);
            permutation(list, n, l + 1);
            swap(list, list[i], list[l]);
        }
    }
    public static void swap(int[] list, int x, int y) {
        int temp = list[x];
        list[x] = list[y];
        list[y] = temp;
    }
    public static void printArray(int n, int[] list) {
        for (int i = 0; i < list.length; i++) {
            System.out.print(list[i]);
        }
    }
}

This code is continuously throws an error:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 3 out of bounds for length 3
    at Permutation.swap(Permutation.java:34)
    at Permutation.permutation(Permutation.java:27)
    at Permutation.permutation(Permutation.java:28)
    at Permutation.main(Permutation.java:15)

I'm not able to understand what to do in this program so that it'll produce desired output.

And what is the meaning of this error which is thrown by program??

Does this answer your question? [Generating permutations of an int array using java -- error](https://stackoverflow.com/questions/13218019/generating-permutations-of-an-int-array-using-java-error) — godzsa, Sep 08 '20 at 08:25
ArrayIndexOutOfBoundsException mean exactly that. Somewhere you use an index number for an array that is greater than the max or lower than min (unlikely) index of the array. — Petronella, Sep 08 '20 at 08:28

score 0 · Answer 1 · answered Sep 08 '20 at 08:29

0

you are getting this error because you are trying to access items, not in the array try changing

i = 0 in line 25

answered Sep 08 '20 at 08:29

Print all possible permutations of an array elements

1 Answers1