75 lines
3.3 KiB
Java
75 lines
3.3 KiB
Java
/*
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* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.math.BigInteger;
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/*
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* @test
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* @bug 8310813
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* @summary Check hashCode implementation against reference values
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*/
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public class HashCode {
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// This test guards against inadvertent changes to BigInteger.hashCode,
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// by checking generated hashCode values against reference values
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// captured immediately before 8310813
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public static void main(String[] args) {
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equals( 0, BigInteger.ZERO);
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equals( 1, BigInteger.ONE);
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equals( 2, BigInteger.TWO);
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equals( 10, BigInteger.TEN);
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equals( -128, BigInteger.valueOf(Byte.MIN_VALUE));
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equals( 127, BigInteger.valueOf(Byte.MAX_VALUE));
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equals( -32768, BigInteger.valueOf(Short.MIN_VALUE));
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equals( 32767, BigInteger.valueOf(Short.MAX_VALUE));
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equals( 0, BigInteger.valueOf(Character.MIN_VALUE));
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equals( 65535, BigInteger.valueOf(Character.MAX_VALUE));
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equals(-2147483648, BigInteger.valueOf(Integer.MIN_VALUE));
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equals( 2147483647, BigInteger.valueOf(Integer.MAX_VALUE));
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equals(-2147483648, BigInteger.valueOf(Long.MIN_VALUE));
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equals( 2147483616, BigInteger.valueOf(Long.MAX_VALUE));
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equals( -1, BigInteger.valueOf(-1));
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// a 37-byte negative number, generated at random
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equals( 1428257188, new BigInteger("""
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-5573526435790097067262357965922443376770234990700620666883\
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2705705469477701887396205062479"""));
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// a 123-byte positive number, generated at random
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equals( -412503667, new BigInteger("""
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13093241912251296135908856604398494061635394768699286753760\
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22827291528069076557720973813183142494646514532475660126948\
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43316474303725664231917408569680292008962577772928370936861\
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12952691245923210726443405774197400117701581498597123145452\
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15111774818054200162634242662445757757255702394598235971294\
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50"""));
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}
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private static void equals(int expectedHashCode, BigInteger i) {
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int actualHashCode = i.hashCode();
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if (expectedHashCode != actualHashCode)
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throw new AssertionError("%s: expectedHashCode=%s, actual=%s"
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.formatted(i, expectedHashCode, actualHashCode));
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}
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}
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