编写一个Java应用程序。用户从键盘输入一个Long范围之间的数，程序将判断这个数是几位数，并判断这个数是否是回文数。回文数是指将该数含有的数字逆序排列后得到的数和原数相同，例如12121、3223都是回文数。并输出个位数所对应的枚举常量。-Write a Java application. User keyboard input a number between Long range, the program will determine the number is few numbers and determine whether the number is a palindrome. Palindrome refers to figures contained in the reverse order number obtained after the same number and the original number, for example 12121,3223 are palindromes. And outputting the corresponding digit enumeration constants.