Introduction - If you have any usage issues, please Google them yourself
The existing string array str_arr, which is a total of 20 elements, to call java.util.Arrays.sort () method to sort. Please write the realization of the java.util.Comparator class, the two strings of the comparison rules: first the number 0 ~ 9 to a J , and ignore the size of the letter. Test the correctness of the implementation class.