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 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.util.function;

import java.util.Objects;

/**
 * Represents an operation that accepts two input arguments and returns no
 * result. This is the two-arity specialization of {@link Consumer}.
 * Unlike most other functional interfaces, {@code BiConsumer} is expected
 * to operate via side-effects.
 *
 * <p>This is a <a href="package-summary.html">functional interface</a>
 * whose functional method is {@link #accept(Object, Object)}.
 *
 * @param <T> the type of the first argument to the operation
 * @param <U> the type of the second argument to the operation
 *
 * @see Consumer
 * @since 1.8
 */
@FunctionalInterface
public interface BiConsumer<T, U> {

 /**
 * Performs this operation on the given arguments.
 *
 * @param t the first input argument
 * @param u the second input argument
 */
 void accept(T t, U u);

 /**
 * Returns a composed {@code BiConsumer} that performs, in sequence, this
 * operation followed by the {@code 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 {@code after} operation will not be performed.
 *
 * @param after the operation to perform after this operation
 * @return a composed {@code BiConsumer} that performs in sequence this
 * operation followed by the {@code after} operation
 * @throws NullPointerException if {@code after} is null
 */
 default BiConsumer<T, U> andThen(BiConsumer<? super T, ? super U> after) {
 Objects.requireNonNull(after);

 return (l, r) -> {
 accept(l, r);
 after.accept(l, r);
 };
 }
}