Module java.base
Package java.util.function

Interface Consumer<T>

  • Type Parameters:
    T - the type of the input to the operation
    All Known Subinterfaces:
    Stream.Builder<T>
    Functional Interface:
    This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

    @FunctionalInterface
public interface Consumer<T>
    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 Detail

      • accept

        void accept​(T t)
        Performs this operation on the given argument.
        Parameters:
        t - the input argument

      • andThen

        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 - 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