大数乘法，设x和y都是n位的二进制整数，计算他们乘积xy，吧整数x和y各分2段-Multiplication of large numbers, let x and y are n-bit binary integer, calculate their product xy, it integers x and y sub-paragraph 2

用原始方法，数组，实现了大数据的相加减，用大数类实现了大数据的乘法-the class of largenumber

蓝桥杯练习题目，包括大数乘法、高斯日记、花朵数、回文数、排序-Blue Bridge Cup practice questions, including large numbers multiply, Gaussian diary, a few flowers, palindrome, sorting

实现了java语言的大数乘法，答题思路即转化为字符串（数组）后进行按位运算，再将结果求和输出。(The multiplication of large numbers in Java language is realized. The way of answering is to transform to string (array), then carry out bitwise operation, and then output results.)