Relations between file names and class names in java

In java, the relationship between file names and class names has the following constraints:

1. The file name saved in Java must be consistent with the class name.

2. If there is only one class in the file, the file name must be consistent with the class name

3. A Java file can contain only one public object file containing more than one class,

4. The file name must be consistent with the public class name. If there are more than one class in the file and there is no public class, the file name can be consistent with any class.
   

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