说明：  编写一个Java应用程序，利用RandomAccessFile类往某个文本文件中写入20个整数(0~19)，然后从该文件的第12个字节开始，将后面所有的数据(对应写入的整数)读出。
(Write a Java application, use RandomAccessFile class to write to a text file 20 integer (0 ~ 19), and then from the first 12 bytes of the file will begin after all of the data (corresponding to an integer is written) read out.)