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The class loader concept, one of the cornerstones of the Java virtual machine, describes the behavior of converting a named class into the bits responsible for implementing that class. Because class loaders exist, the Java run time does not need to know anything about files and file systems when running Java programs.
Most identifiersin the Java(TM) programming environment have either class or local scope. Instance and classvariables and methods have class scope; they can be used outside the class and its subclasses onlyby prefixing them with an instance of the class or (for class variables and methods) with the classname.