List工具类实现增删改查

假设有集合A和集合B，集合A表示最新的配置，集合B表示原有的旧配置

public static <T> Map<String, List<T>>  mergeCollection(List<T> resList,List<T> targetList){
    Map<String, List<T>> resultMap = Maps.newHashMap();
    List<T> preAddList = Collections.emptyList();
    List<T> preDelList = Collections.emptyList();
    if(CollUtil.isEmpty(resList)){
        preDelList.addAll(targetList);
    }
    if(CollUtil.isEmpty(targetList)){
        preAddList.addAll(targetList);
    }
    if(CollUtil.isNotEmpty(resList) && CollUtil.isNotEmpty(targetList)){
        //获取交集
        Collection<T> interactList = CollUtil.intersection(resList,targetList);
        Collection<T> preAddData = CollUtil.disjunction(resList, interactList);
        Collection<T> preDelData = CollUtil.disjunction(targetList, interactList);
        preAddList.addAll(preAddData);
        preDelList.addAll(preDelData);
    }
    resultMap.put(PRE_ADD_DATA,preAddList);
    resultMap.put(PRE_DEL_DATA,preDelList);
    return resultMap;
}

最后

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