示例#1
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 public void addPraisedPhoto(Photo photo) {
   praisedPhotos.add(photo);
 }
示例#2
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 public void clearPraisedPhotos() {
   praisedPhotos.clear();
 }
示例#3
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 public boolean hasPraisedPhoto(Photo photo) {
   return praisedPhotos.contains(photo);
 }