Package org.apache.commons.collections4.functors

Class NullPredicate<T>

java.lang.Object

org.apache.commons.collections4.functors.AbstractPredicate<T>

org.apache.commons.collections4.functors.NullPredicate<T>

Type Parameters:

T - the type of the input to the predicate.

All Implemented Interfaces:

Serializable, Predicate<T>, Predicate<T>

public final class NullPredicate<T>
extends AbstractPredicate<T>
implements 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 final Predicate	INSTANCE	Singleton predicate instance

Method Summary

Modifier and Type	Method	Description
static <T> Predicate<T>	nullPredicate()	Factory returning the singleton instance.
boolean	test(T object)	Evaluates the predicate returning true if the input is null.

Methods inherited from class org.apache.commons.collections4.functors.AbstractPredicate

evaluate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.function.Predicate

and, negate, or

Field Details

INSTANCE

public static final Predicate INSTANCE

Singleton predicate instance

Method Details

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

test

public boolean test(T object)

Evaluates the predicate returning true if the input is null.

Specified by:

test in interface Predicate<T>

Specified by:

test in interface Predicate<T>

Parameters:

object - the input object

Returns:

true if input is null