92 lines
3.1 KiB
Java
92 lines
3.1 KiB
Java
/*
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* Copyright (c) 2022, 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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/*
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* @test
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* @summary Verify nextDouble stays within range
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* @bug 8280550 8280950
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*/
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import java.util.SplittableRandom;
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import java.util.random.RandomGenerator;
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public class RandomNextDoubleBoundary {
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public static void main(String... args) {
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negativeBounds();
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positiveBounds();
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}
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private static void negativeBounds() {
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// Both bounds are negative
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double lowerBound = -1.0000000000000002;
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double upperBound = -1.0;
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var sr = new SplittableRandom(42L);
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var r = sr.nextDouble(lowerBound, upperBound);
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if (r >= upperBound) {
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System.err.println("r = " + r + "\t" + Double.toHexString(r));
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System.err.println("ub = " + upperBound + "\t" + Double.toHexString(upperBound));
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throw new RuntimeException("Greater than upper bound");
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}
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if (r < lowerBound) {
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System.err.println("r = " + r + "\t" + Double.toHexString(r));
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System.err.println("lb = " + lowerBound + "\t" + Double.toHexString(lowerBound));
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throw new RuntimeException("Less than lower bound");
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}
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}
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private static void positiveBounds() {
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double[][] originAndBounds = {{10, 100},
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{12345, 123456},
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{5432167.234, 54321678.1238}};
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for (double[] originAndBound : originAndBounds) {
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nextDoublesWithRange(originAndBound[0], originAndBound[1]);
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}
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}
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public static void nextDoublesWithRange(double origin, double bound) {
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RandomGenerator rg = new RandomGenerator() {
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@Override
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public double nextDouble() {
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return Double.MAX_VALUE;
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}
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@Override
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public long nextLong() {
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return 0;
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}
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};
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double value = rg.nextDouble(origin, bound);
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assertTrue(value >= origin);
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assertTrue(value < bound);
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}
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public static void assertTrue(boolean condition) {
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if (!condition) {
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throw new AssertionError();
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}
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}
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}
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