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並前往https://www.reddit.com/r/java/comments/ojc7w/why_concurrenthashmap_does_not_support_null_values/

Why ConcurrentHashMap does not support null values - Reddit

For ConcurrentHashMap/TreeMap: Object value = map.get(key); if(null == value) throw new NoSuchElementException("No mapping for " + key);.

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