@Override
        public final int hashCode() {
            return (ObjectUtils.nullSafeHashCode(this.key) ^ ObjectUtils.nullSafeHashCode(this.value));
        }
A single map entry.

@param <K> the key type
@param <V> the value type
ttl-core/src/main/java/com/alibaba/ttl3/internal/util/ConcurrentReferenceHashMap.java