java.util.function

public Interface Consumer<T>

Known Direct Subinterfaces

java.lang.classfile.ClassFileBuilder, java.util.stream.Sink, java.util.stream.Stream.Builder

Known Direct Implementers

java.util.stream.GathererOp.NodeBuilder, java.util.stream.SpinedBuffer, java.util.stream.StreamSpliterators.UnorderedSliceSpliterator.OfRef, java.util.stream.StreamSpliterators.DistinctSpliterator, java.util.stream.StreamSpliterators.ArrayBuffer.OfRef, java.util.stream.WhileOps.UnorderedWhileSpliterator.OfRef, jdk.internal.classfile.impl.ChainedClassBuilder, java.util.Spliterators.AbstractSpliterator.HoldingConsumer

Annotations

@FunctionalInterface

Type Parameters

<T>: the type of the input to the operation

Imports

java.util.Objects

Represents an operation that accepts a single input argument and returns no result. Unlike most other functional interfaces, Consumer is expected to operate via side-effects.

This is a functional interface whose functional method is accept(Object).

Since: 1.8

Method Summary

Modifier and Type	Method and Description
public void	accept(T the input argument t) Performs this operation on the given argument.
public default Consumer<T>	Returns: a composed `Consumer` that performs in sequence this operation followed by the `after` operation andThen(Consumer<? super T> the operation to perform after this operation after) Returns a composed `Consumer` that performs, in sequence, this operation followed by the `after` operation.

Method Detail

accept	back to summary
public void accept(T t) Performs this operation on the given argument. Parameters t:T the input argument

back to summary

public void accept(T t)

Performs this operation on the given argument.

Parameters

t:T: the input argument

andThen back to summary

andThen	back to summary
public default Consumer<T> andThen(Consumer<? super T> after) Returns a composed `Consumer` that performs, in sequence, this operation followed by the `after` operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation. If performing this operation throws an exception, the `after` operation will not be performed. Parameters after:Consumer<? super T> the operation to perform after this operation Returns:Consumer<T> a composed `Consumer` that performs in sequence this operation followed by the `after` operation Exceptions NullPointerException: if `after` is null

public default Consumer<T> andThen(Consumer<? super T> after)

Returns a composed Consumer that performs, in sequence, this operation followed by the after operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation. If performing this operation throws an exception, the after operation will not be performed.

Parameters

after:Consumer<? super T>: the operation to perform after this operation

Returns:Consumer<T>

a composed Consumer that performs in sequence this operation followed by the after operation

Exceptions

NullPointerException:: if after is null