All Implemented Interfaces:

java.io.Serializable
```
public class ObjectUtils.Null
 implements Serializable
                    
```
Class used as a null placeholder where {@code null} has another meaning.
For example, in a {@code HashMap} the get method returns {@code null} if the {@code Map} contains {@code null} or if there isno matching key. The {@code Null} placeholder can be used to distinguishbetween these two cases.
Another example is {@code Hashtable}, where {@code null} cannot be stored.

Class ObjectUtils.Null