for (String epc :epcList){ if (inventoryMap.containsKey(epc)){ } }

这是一个简单的Java代码，它遍历一个名为epcList的字符串列表，并检查一个名为inventoryMap的Map是否包含该列表中的每个字符串。如果Map包含该字符串，则代码会执行if语句中的操作。如果Map不包含该字符串，则代码不执行任何操作。

需要注意的是，这段代码中if语句中的操作是空的，也就是说，如果Map包含该字符串，代码不会执行任何操作。这可能不是实际应用中所需要的。可以将if语句中的操作替换为需要执行的操作，或者在if语句后面添加else语句来处理Map不包含该字符串的情况。

相关问题

for (String epc :epcList){ if (inventoryMap.containsKey(epc)){ } }代码优化后怎么写

如果您只是想检查`inventoryMap`中是否包含`epcList`中的所有元素，可以使用Java 8中的Stream API，如下所示：

boolean allExist = epcList.stream().allMatch(inventoryMap::containsKey);

这将返回一个布尔值，指示`epcList`中的所有元素是否都存在于`inventoryMap`中。

如果您想对`inventoryMap`中存在的`epcList`元素进行操作，则可以使用`forEach`方法，如下所示：

epcList.stream().filter(inventoryMap::containsKey).forEach(epc -> {
    // 对于存在于inventoryMap中的每个epc，执行操作
});

这将仅对存在于`inventoryMap`中的`epcList`元素执行操作。

List<TVehcertUploadLog> list = tVehcertUploadLogService.list(new LambdaQueryWrapper<TVehcertUploadLog>().eq(StringUtils.isNotBlank(tVehcertUploadLog.getVin()),TVehcertUploadLog::getVin,tVehcertUploadLog.getVin()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehWzhgzbh()),TVehcertUploadLog::getVehWzhgzbh,tVehcertUploadLog.getVehWzhgzbh()) .like(StringUtils.isNotBlank(tVehcertUploadLog.getBz()),TVehcertUploadLog::getBz,tVehcertUploadLog.getBz()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsValid()),TVehcertUploadLog::getIsValid,tVehcertUploadLog.getIsValid()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsSample()),TVehcertUploadLog::getIsSample,tVehcertUploadLog.getIsSample()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getCreateBy()),TVehcertUploadLog::getCreateBy,tVehcertUploadLog.getCreateBy()) .ge(tVehcertUploadLog.getParams().containsKey("startTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()), TVehcertUploadLog::getUpDate,tVehcertUploadLog.getParams().containsKey("startTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString())?sdf.parse(tVehcertUploadLog.getParams().get("startTime").toString()):"") .le(tVehcertUploadLog.getParams().containsKey("endTime")&&StringUtils.isNotEmpty(tVehcertUploadLog .getParams().get("endTime").toString()),TVehcertUploadLog::getUpDate,tVehcertUploadLog.getParams().containsKey("endTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString())?sdfs.parse(tVehcertUploadLog.getParams().get("endTime").toString()+" 23:59:59"):"") );如何再加一个联表查询

要实现联表查询，可以使用`leftJoin`或`innerJoin`等方法来连接关联的表，然后在查询条件中使用关联表的字段。示例代码如下：

List<TVehcertUploadLog> list = tVehcertUploadLogService.list(new LambdaQueryWrapper<TVehcertUploadLog>()
        .eq(StringUtils.isNotBlank(tVehcertUploadLog.getVin()), TVehcertUploadLog::getVin, tVehcertUploadLog.getVin())
        .eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehWzhgzbh()), TVehcertUploadLog::getVehWzhgzbh, tVehcertUploadLog.getVehWzhgzbh())
        .like(StringUtils.isNotBlank(tVehcertUploadLog.getBz()), TVehcertUploadLog::getBz, tVehcertUploadLog.getBz())
        .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsValid()), TVehcertUploadLog::getIsValid, tVehcertUploadLog.getIsValid())
        .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsSample()), TVehcertUploadLog::getIsSample, tVehcertUploadLog.getIsSample())
        .eq(StringUtils.isNotBlank(tVehcertUploadLog.getCreateBy()), TVehcertUploadLog::getCreateBy, tVehcertUploadLog.getCreateBy())
        .ge(tVehcertUploadLog.getParams().containsKey("startTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()), TVehcertUploadLog::getUpDate, tVehcertUploadLog.getParams().containsKey("startTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()) ? sdf.parse(tVehcertUploadLog.getParams().get("startTime").toString()) : "")
        .le(tVehcertUploadLog.getParams().containsKey("endTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString()), TVehcertUploadLog::getUpDate, tVehcertUploadLog.getParams().containsKey("endTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString()) ? sdfs.parse(tVehcertUploadLog.getParams().get("endTime").toString() + " 23:59:59") : "")
        .leftJoin(TVehcert.class, TVehcert::getVehId, TVehcertUploadLog::getVehId)
        .eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehXh()), TVehcert::getVehXh, tVehcertUploadLog.getVehXh())
);

上述代码中，使用了`leftJoin`方法将`TVehcertUploadLog`表与`TVehcert`表关联，关联条件是`TVehcertUploadLog`表的`vehId`字段与`TVehcert`表的`vehId`字段相等。然后在查询条件中使用了`TVehcert`表的`vehXh`字段进行查询。