TDFirstEvent

```
public class TDFirstEvent
extends TDEventModel
                    
```
TDUniqueEvent Used to describe the first event. The server uses the event name and #first_check_id to determine if the event was first fired. If the event already exists in the system, the current data is ignored. By default, the device ID is used as #first_check_id.

Constructor Summary

Constructors
Constructor	Description
`TDFirstEvent(String eventName, JSONObject properties)`	Constructor to create the first event object based on the event name and properties.

Method Summary

Modifier and Type	Method	Description
`void`	`setFirstCheckId(String firstCheckId)`	Set the custom #first_check_id.

Methods inherited from class cn.thinkingdata.analytics.ThinkingAnalyticsEvent
setEventTime, setEventTime
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - TDFirstEvent
```
TDFirstEvent(String eventName, JSONObject properties)
```
    Constructor to create the first event object based on the event name and properties.
    
    Parameters:
    
    eventName - event name
    
    properties - event properties，can be null
- Method Detail
  - setFirstCheckId
```
 void setFirstCheckId(String firstCheckId)
```
    Set the custom #first_check_id.
    
    Parameters:
    
    firstCheckId - This parameter is used to detect whether it is reported for the first time.