IMapTKey, TValuePutIfAbsent Method | 
| Name | Description | |
|---|---|---|
| PutIfAbsent(TKey, TValue) | 
                If the specified key is not already associated
                with a value, associate it with the given value.
              | |
| PutIfAbsent(TKey, TValue, Int64, TimeUnit) | 
                Puts an entry into this map with a given ttl (time to live) value
                if the specified key is not already associated with a value.
              |