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getRootDirectories()

 
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FileSystem is an abstract class and method getRootDirectories() is also an abstract method, so how it is executing ? where is it's implementation ?
 
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The answer lies in the class of the object returned by FileSystems.getDefault() method. The javadoc of that method here http://docs.oracle.com/javase/7/docs/api/java/nio/file/FileSystems.html#getDefault%28%29 has more details. If you want to check which exact class is being used as the default, just do a:

 
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