NullPredicate

java.lang.Object
- org.apache.commons.collections4.functors.NullPredicate<T>

All Implemented Interfaces:

java.io.Serializable, Predicate<T>
```
public final class NullPredicate<T>
extends java.lang.Object
implements Predicate<T>, java.io.Serializable
```
Predicate implementation that returns true if the input is null.

Since:

3.0

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static Predicate INSTANCE
Singleton predicate instance

private static long serialVersionUID
Serial version UID

Constructor Summary

Constructors
Modifier Constructor Description

private NullPredicate()
Restricted constructor.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`evaluate(T object)`	Evaluates the predicate returning true if the input is null.
`static <T> Predicate<T>`	`nullPredicate()`	Factory returning the singleton instance.
`private java.lang.Object`	`readResolve()`

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

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    Serial version UID
    
    See Also:
    
    Constant Field Values
  - INSTANCE
```
public static final Predicate INSTANCE
```
    Singleton predicate instance
- Constructor Detail
  - NullPredicate
```
private NullPredicate()
```
    Restricted constructor.
- Method Detail
  - nullPredicate
```
public static <T> Predicate<T> nullPredicate()
```
    Factory returning the singleton instance.
    
    Type Parameters:
    
    T - the type that the predicate queries
    
    Returns:
    
    the singleton instance
    
    Since:
    
    3.1
  - evaluate
```
public boolean evaluate(T object)
```
    Evaluates the predicate returning true if the input is null.
    
    Specified by:
    
    evaluate in interface Predicate<T>
    
    Parameters:
    
    object - the input object
    
    Returns:
    
    true if input is null
  - readResolve
```
private java.lang.Object readResolve()
```