Consumer

  • Consumer is a functional interface representing an operation that takes an input and produces no result, primarily working through side-effects.

  • It includes the accept method to perform the operation on the given input and the andThen method to chain multiple Consumer instances for sequential execution.

  • Consumer is commonly used in scenarios where actions need to be performed on data without necessarily returning a value, such as logging or modifying data structures.
public interface Consumer
Known Indirect Subclasses

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).

Public Method Summary

abstract void
accept(T t)
Performs this operation on the given argument.
Consumer<T>
andThen(Consumer<? super T> after)
Returns a composed Consumer that performs, in sequence, this operation followed by the after operation.

Public Methods

public abstract void accept (T t)

Performs this operation on the given argument.

Parameters
t the input argument

public 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 the operation to perform after this operation
Returns
  • a composed Consumer that performs in sequence this operation followed by the after operation
Throws
NullPointerException if after is null