java错误提示------ The public type must be defined in its own file
The public type must be defined in its own file
翻译：公共类必须被定义在它自己的文件中
产生错误的原因：
1.定义Java类名同文件名不一样
2.一个文件中有多个类，只有与文件名一致的类名，才能声明为：public
内部类不能声明为：public
一个文件中只能有一个public类
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傷城~
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