ConcurrentSkipListMap实现随机数命中权重占比

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public String getCoverBottom(FlowAdditions additions) {         if(null==additions){             return "默认";         }         List<FlowCoverBottom> li = this.isMatchBottom(additions);         if(null == li || li.isEmpty()){             return "默认";         }         //根据权重输出兜底方。         int sum = li.stream().mapToInt(FlowCoverBottom::getIntRatio).sum();         int random = RandomUtils.nextInt(0, sum);         ConcurrentSkipListMap<Integer,String> skipListMap = new ConcurrentSkipListMap<>();         int ceiling = 0;         for(int i=0;i<li.size();i++){             FlowCoverBottom bottom = li.get(i);             ceiling = ceiling+bottom.getIntRatio();             skipListMap.put(ceiling,bottom.getCode());         }         return skipListMap.higherEntry(random).getValue();     }