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static public void emptyDirectory(File directory) {
    File[ ] entries = directory.listFiles( );
    for(int i=0; i
     
              entries[i].delete( );
      
    }
      
}
     

static public void deleteDirectory(File dir) throws IOException {
    if( (dir == null) || !dir.isDirectory) {
        throw new IllegalArgumentException(
                  "Argument "+dir+" is not a directory. "
              );
    }

    File[ ] entries = dir.listFiles( );
    int sz = entries.length;

    for(int i=0; i
     
              if(entries[i].isDirectory( )) {
      
            deleteDirectory(entries[i]);
      
        } else {
      
            entries[i].delete( );
      
        }
      
    }
      

      
   dir.delete();
      
}