【实训Day04】静态static、单例模式

一.静态

什么是静态，静态有什么作用呢？_夏天拐跑了西瓜的博客-优快云博客_什么是静态https://blog.youkuaiyun.com/weixin_42303792/article/details/107902037?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163420277416780265474260%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=163420277416780265474260&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~top_click~default-1-107902037.first_rank_v2_pc_rank_v29&utm_term=%E9%9D%99%E6%80%81&spm=1018.2226.3001.4187

二.单例模式

单例模式 | 菜鸟教程 (runoob.com)https://www.runoob.com/design-pattern/singleton-pattern.html