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   * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   * questions.
   */
  package java.util.function;
  
  import java.util.Objects;
  
  /**
   * Represents an operation that accepts a single input argument and returns no
   * result. Unlike most other functional interfaces, {@code Consumer} 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)}.
   *
   * @param <T> the type of the input to the operation
   *
   * @since 1.8
   */
  @FunctionalInterface
  public interface Consumer<T> {
  
      /**
       * Performs this operation on the given argument.
       *
       * @param t the input argument
       */
      void accept(T t);
  
      /**
       * Returns a composed {@code Consumer} 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 Consumer} that performs in sequence this
       * operation followed by the {@code after} operation
       * @throws NullPointerException if {@code after} is null
       */
      default Consumer<T> andThen(Consumer<? super T> after) {
          Objects.requireNonNull(after);
          return (T t) -> { accept(t); after.accept(t); };
      }
  }
  