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test/jdk/java/util/Random/NextIntPowerOfTwoMod.java
42 строки
2 KB
Doug Lea
8189764: Miscellaneous changes imported from jsr166 CVS 2017-11
10 ноя 2017, 03:14
10 ноя 2017, 03:14
5d5334f
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/* * Copyright (c) 1999, 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. * * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @bug 4187412 * @summary The FCS release of 1.2 did not special case the Random.nextInt * calculation for a power of two modulus, as mandated by the spec. */ import java.util.Random; public class NextIntPowerOfTwoMod { public static void main(String[] args) throws Exception { Random r = new Random(69); int total = 0; for (int i=0; i<1000; i++) total += r.nextInt(16); if (total != 7639) throw new RuntimeException("Not using correct algorithm."); } }