java是以package也就是包来管理和组织代码。所以我们需要先创建一个包，再在这个包下创建文件，这样ide就会自动引入这个包名。
使用最新版eclipse,可能遇到这样的问题(报错): “ Must declare a named package because this compilation unit is associated to the named module ‘XXX’ ” 出现这种情况的原因是在最新版eclipse中,定义一个class类的同时需要对包(pack... RT-Thread OTA升级失败The application must link to the begin of ...
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