根据除以3的结果调整数组

https://www.wesiedu.com/zuoye/6402062082.html

    public static void main(String[] args) throws Exception {
        int[] arr = {1,2,3,4,5,6,7,8,9};
        adjustArr(arr);
}
    //数组，所有3的倍数在最左边,所有除3余1的数在中间,所有除3余2的放 最右边
    public static void adjustArr(int[] arr){
        if(arr==null||arr.length==0) {
            System.out.println("WRONG INPUT");
            return;
        }
        int[] res = new int[arr.length];
        int j = 0;
        for(int i =0;i<arr.length;i++){
            if(arr[i]%3 == 0){
                res[j++] = arr[i];
            }
        }
        for(int i =0;i<arr.length;i++){
            if(arr[i]%3 == 1){
                res[j++] = arr[i];
            }
        }
        for(int i =0;i<arr.length;i++){
            if(arr[i]%3 == 2){
                res[j++] = arr[i];
            }
        }
        arr = res;
        System.out.println(Arrays.toString(arr));   
    }