public static void getDifferenceSetByGuava(Map<String, Object> bigMap, Map<String, String> smallMap, Map<String, Object> resMap) {
Set<String> bigMapKey = bigMap.keySet();
Set<String> smallMapKey = smallMap.keySet();
Set<String> differenceSet = Sets.difference(bigMapKey, smallMapKey);
for (String key : differenceSet) {
resMap.put(key, bigMap.get(key));
}
}
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