List转Map

//以userid为主，重复数据不获取，不会抛出异常
Map<Long, UserLoginLog> longDateMap = userLoginLogList.stream()
        .collect(Collectors.toMap(UserLoginLog::getUserId, Function.identity(),  (key1, key2) -> key1));

//业务逻辑
if(longDateMap.containsKey(listVo.getUserId()))
　　listVo.setLastActivityTime((Objects.nonNull(longDateMap.get(listVo.getUserId()))) ? null : longDateMap.get(listVo.getUserId()).getCreateTime());

//以下会抛出异常
Map<Long, String> userMap = userInfoList.stream()
        .collect(Collectors.toMap(k -> k.getUserId(), k -> k.getNickName()));
Map<Long, CustomerInfo> customerInfoMap = customerInfoList.stream().
        collect(Collectors.toMap(k -> k.getUserId(), k -> k));

//业务逻辑
if(userMap.containsKey(listVo.getUserId()))
　　listVo.setNickName(userMap.get(listVo.getUserId()));

if(customerInfoMap.containsKey(listVo.getUserId())){
    listVo.setKycTier(customerInfoMap.get(listVo.getUserId()).getIdentityCheckLevelNumber());