MapReduce.NullObject (Apache TinkerPop 3.7.2 API)

java.lang.Object
- org.apache.tinkerpop.gremlin.process.computer.MapReduce.NullObject

All Implemented Interfaces:

Serializable, Comparable<MapReduce.NullObject>

Enclosing interface:

MapReduce<MK,MV,RK,RV,R>
```
public static class MapReduce.NullObject
extends Object
implements Comparable<MapReduce.NullObject>, Serializable
```
A convenience singleton when a single key is needed so that all emitted values converge to the same combiner/reducer.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

NullObject()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`compareTo(MapReduce.NullObject object)`
`boolean`	`equals(Object object)`
`int`	`hashCode()`
`static MapReduce.NullObject`	`instance()`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - NullObject
```
public NullObject()
```
- Method Detail
  - instance
```
public static MapReduce.NullObject instance()
```
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object object)
```
    Overrides:
    
    equals in class Object
  - compareTo
```
public int compareTo(MapReduce.NullObject object)
```
    Specified by:
    
    compareTo in interface Comparable<MapReduce.NullObject>
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object