1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package java.util.function; 26 27 import java.util.Objects; 28 29 /** 30 * An operation which accepts a single double argument and returns no result. 31 * This is the primitive type specialization of {@link Consumer} for 32 * {@code double}. Unlike most other functional interfaces, 33 * {@code DoubleConsumer} is expected to operate via side-effects. 34 * 35 * @see Consumer 36 * @since 1.8 37 */ 38 @FunctionalInterface 39 public interface DoubleConsumer { 40 41 /** 42 * Accept an input value. 43 * 44 * @param value the input value 45 */ 46 void accept(double value); 47 48 /** 49 * Returns a {@code DoubleConsumer} which performs, in sequence, the operation 50 * represented by this object followed by the operation represented by 51 * another {@code DoubleConsumer}. 52 * 53 * <p>Any exceptions thrown by either {@code accept} method are relayed 54 * to the caller; if performing this operation throws an exception, the 55 * other operation will not be performed. 56 * 57 * @param other a DoubleConsumer which will be chained after this 58 * DoubleConsumer 59 * @return an DoubleConsumer which performs in sequence the {@code accept} method 60 * of this DoubleConsumer and the {@code accept} method of the specified IntConsumer 61 * operation 62 * @throws NullPointerException if other is null 63 */ 64 default DoubleConsumer chain(DoubleConsumer other) { 65 Objects.requireNonNull(other); 66 return (double t) -> { accept(t); other.accept(t); }; 67 } 68 }