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1.Java Source And Data Type
2.Operators
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SCJP » Java Source And Data Type » Java Source 
1.1.1.Source Files
All Java source files must end with the .java extension. 
A source file should contain one top-level public class.
If public class is present, the class name must match the unextended filename.
A source file may contain an unlimited number of non-public classes.
A file can have only one package statement, but multiple imports.
1.1.Java Source
1.1.1.Source Files
1.1.2.Three top-level compilation units may appear in a file.
1.1.3.Three top-level compilation units are not all required.
1.1.4.If three top-level compilation units are present, then they must appear in the following order
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