利用牛-拉法做的一个潮流计算，用java写的。。。本科时作的，虽然有点繁琐，但是也不失为一种方法。具体解释见程序。-use of cattle-Rafah done a trend basis, using java writes. . . At the undergraduate, though a bit tedious, but they are also a means to an end. See detailed explanation procedures.