This interface defines a single method that is called to obtain the MIME type of a file based on the name of the file. The fileNameMap field of the URLConnection class refers to an object that implements this interface. The filename-to-file-type map it implements is used by the static URLConnection.guessContentTypeFromName( ) method.

public interface FileNameMap {
// Public Instance Methods
     String getContentTypeFor(String fileName);  
}

Passed To

URLConnection.setFileNameMap( )

Returned By

URLConnection.getFileNameMap( )