出现The public type c must be defined in its own file这个问题，是由于定义的JAVA类同文件名不一致
你的文件里很可能有两个 public 的类，而Java文件里只允许出现一个 public 类
解决方法：
1、把文件名修改同公共类一样的名字；
2、把类名修改成同文件名；
3.子类继承父类时，不需要再用public修饰
Java报错 -- The public type c must be defined in its own file
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