How can I print number of occurences of an array from an array list in Java?-CodePudding

I have an arraylist that contains some arrays, I want to print out the arraylist, if an array in the arraylist is repeated then print it only one time with a number of occurences next to it. (Assumes all arrays are sorted from smallest to biggest)

Here is my current code:

public static void main(String[] args) {
        int[] a1 = {1,2,3,4,5};
        int[] a2 = {1,2,3,4,5};
        int[] a3 = {1,2,3,4,5};

        int[] a4 = {2,5,7,8,9};
        int[] a5 = {2,5,7,8,9};

        int[] a6 = {3,4,6,8,9};

        ArrayList<int[]> list = new ArrayList<>();

        list.add(a1);
        list.add(a2);
        list.add(a3);
        list.add(a4);
        list.add(a5);
        list.add(a6);

        for (int i = 0; i < list.size(); i  ) {
            System.out.println(Arrays.toString(list.get(i)));
        }
    }

Here is the output that I want:

1,2,3,4,5 (3)
2,5,7,8,9 (2)
3,4,6,8,9

(If it unique then don't need occurences number)

Thank you very much for your help!

CodePudding user response：

Use List<Integer> instead of int[], because List’s equals() (and hashCode()) method can be used to good effect.

Assuming:

List<List<Integer>> list = new ArrayList<>();
list.add(List.of(1,2,3,4,5));
// etc

Then it’s a one-liner:

list.stream().distinct().forEach(System.out::println);