插入排序与数组查重

    //插入排序
    public static void main(String[] args) {
        Random random = new Random();
        int [] arr = new int[12];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = random.nextInt(12)+8;
        }
        System.out.println(Arrays.toString(arr));
        chaSort(arr);
        System.out.println(Arrays.toString(arr));
        System.out.println("index:"+removeRepeatArr(arr));
        System.out.println(Arrays.toString(arr));
    }

    public static void chaSort(int [] arr){
        for (int i = 1; i < arr.length; i++) {
            for (int j = i; j > 0 && arr[j] < arr[j-1] ; j--) {
                swap(arr,j,j-1);
            }
        }
    }

    public static void swap(int [] arr,int a,int b){
        int temp = 0;
        temp = arr[a];
        arr[a] = arr[b];
        arr[b] = temp;
    }
    //排序好的数组，去重。
    public static int removeRepeatArr(int[] arr) {
        int n = arr.length;
        int index = 0;
        if(n < 0){
            return index;
        }
        index = 1;
        for (int i = 1; i < n; i++) {
            if (arr[i] != arr[i-1]) {
                arr[index] = arr[i];
                index++;
            }
        }
        return index;
    }