Public: (Public) Public, accessible, generally need to be accessed
Protected: (Protected) This category, sub-category, and the same package can be accessed according to the actual situation
Default: (default) The same package can be accessed, generally not recommended Default
Private: (private) Access is the most restrictive, only the methods and properties accessible by this class are not public
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Original: https: //www.cnblogs.com/itml/p/12757797.html
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