Wednesday, September 29, 2010
Compilation unit
When you create a source-code file for Java, it’s commonly called a compilation unit (sometimes a translation unit). Each compilation unit must have a name ending in .java, and inside the compilation unit there can be a public class that must have the same name as the file (including capitalization, but excluding the .java file name extension). There can be only one public class in each compilation unit; otherwise, the compiler will complain. If there are additional classes in that compilation unit, they are hidden from the world outside that package because they’re not public, and they comprise "support" classes for the main public class.
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