字符串拆分split

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public static void main(String[] args) {         String s = "A1B2C3D4E5F6G7H8";         String[] arr1 = s.split("[1-8]");         String[] arr2 = s.split("[A-H]");//         System.out.println(Arrays.toString(arr1));//[A, B, C, D, E, F, G, H]         System.out.println(Arrays.toString(arr2));//[, 1, 2, 3, 4, 5, 6, 7, 8]         int[] a = new int[8];         for (int i = 1; i < arr2.length; i++) {             a[i-1] = Integer.valueOf(arr2[i]);         }         System.out.println(Arrays.toString(a));                   System.out.println(arr2.length);//9 首个字母也被当做拆分符，所以，它前面有个空字符串         System.out.println(arr1.length);//8       }