public static void main(String[] args){
            int[] result = insertionSort({10,3,4,12,2});
    }

    public static int[] insertionSort(int[] arr){
        return arr;
    }

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Syntax error on token(s), misplaced construct(s)
Syntax error on token ")", delete this token

public static void main(String[] args){
        int[] arr = {10,3,4,12,2};
        int[] result = insertionSort(arr);
    }

    public static int[] insertionSort(int[] arr){
        return arr;
    }

int[] result = insertionSort(new int[]{10,3,4,12,2});

int[] arr = {10,3,4,12,2};

int[] arr; // already declared here but not initialized yet
arr = {10,3,4,12,2}; // not a declaration statement so not allowed

insertionSort({10,3,4,12,2})

int[] result = insertionSort(new int[]{10,3,4,12,2});