1 /* 2 * Copyright (c) 2012, 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 /** 28 * Represents a function that accepts a long-valued argument and produces a 29 * result. This is the {@code long}-consuming primitive specialization for 30 * {@link Function}. 31 * 32 * <p>This is a <a href="package-summary.html">functional interface</a> 33 * whose functional method is {@link #apply(long)}. 34 * 35 * @param <R> the type of the result of the function 36 * 37 * @see Function 38 * @since 1.8 39 */ 40 @FunctionalInterface 41 public interface LongFunction<R> { 42 43 /** 44 * Applies this function to the given argument. 45 * 46 * @param value the function argument 47 * @return the function result 48 */ apply(long value)49 R apply(long value); 50 } 51