LeetCode2562

 public static long jointArrayData(int[] nums) {
        //定义变量存放数据
        long num = 0;
        //头尾“相加”
        for (int i = 0,j = nums.length-1; i <= j; i++,j--) {
            if (i!=j){
    		 //String.valueOf先将Int转String，进行字符串的连接，再用Integer.parseInt方法转回Int
                String str = String.valueOf(nums[i])+String.valueOf(nums[j]);
                num += Integer.parseInt(str);
            }else {
                num+=nums[i];
            }
        }
        System.out.println(num);
        return num;
    }