编写一个java应用程序。用户从键盘输入一个1-9999之间的数，程序将判断这个数是几位数，并判断这个数是否回文数。回文数是指将数含有的数字逆序排列后得到的数和原数相同，例如12121,4224,6778776等都是回文数。

1）程序具有判断用户的输入是否为合法整数的功能。对非法输入（例如含有字母）要进行处理。

2）要判断输入数的位数，并输出相关信息。

3）要判断是否回文数。

-Write a Java applications. The user from the keyboard a 1-9999 between number, the program will judge this number is a few digits, and to determine the number of reported number is. Palindrome number refers to the number of the digital reverse arrangement with the number obtained when the same number and, such as 12121422 4677776 is the number of reported.

1) procedure has judgment user input is the function of the integer as legal. Of illegal input (for example contains letters) to deal with.

2) to determine the number of input and output information, digits.

3) to determine whether palindrome number.