If this abstract pathname does not denote a directory, then this method returns {@code null}. Otherwise an array of strings is returned, one for each file or directory in the directory. Names denoting the directory itself and the directory's parent directory are not included in the result. Each string is a file name rather than a complete path.
There is no guarantee that the name strings in the resulting array will appear in any specific order; they are not, in particular, guaranteed to appear in alphabetical order. @return An array of strings naming the files and directories in thedirectory denoted by this abstract pathname. The array will be empty if the directory is empty. Returns {@code null} ifthis abstract pathname does not denote a directory, or if an I/O error occurs. @throws SecurityException If a security manager exists and its {@link SecurityManager#checkRead(String)} method denies read access tothe directory
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