UML序列图总结(Loop、Opt、Par和Alt)https://www.cnblogs.com/cy568searchx/p/6227238.html版权声明:本文为weixin_45948234原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接和本声明。原文链接:https://blog.csdn.net/weixin_45948234/article/details/112847875