摘要:
![](https://img2020.cnblogs.com/blog/2568825/202110/2568825-20211028214032175-190399333.png)![](https://img2020.cnblogs.com/blog/2568825/202110/2568825-20211031091150714-585524206.png)![](https://img2... 阅读全文
摘要:
定义包:package 导入包:import .*叫通配符,会将这个包里的所有东西都导入进来 阅读全文