110 lines
3.9 KiB
Java
110 lines
3.9 KiB
Java
/*
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* Copyright (c) 1998, 2018, 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 static java.math.BigInteger.ONE;
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import java.math.BigInteger;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.Random;
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/**
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* @test
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* @bug 7131192
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* @summary This test ensures that BigInteger.floatValue() and
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* BigInteger.doubleValue() behave correctly.
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* @author Louis Wasserman
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*/
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public class PrimitiveConversionTests {
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static final List<BigInteger> ALL_BIGINTEGER_CANDIDATES;
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static {
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List<BigInteger> samples = new ArrayList<>();
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// Now add values near 2^N for lots of values of N.
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for (int exponent : Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 31, 32, 33,
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34, 62, 63, 64, 65, 71, 72, 73, 79, 80, 81, 255, 256, 257, 511,
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512, 513, Double.MAX_EXPONENT - 1, Double.MAX_EXPONENT,
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Double.MAX_EXPONENT + 1, 2000, 2001, 2002)) {
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BigInteger x = ONE.shiftLeft(exponent);
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for (BigInteger y : Arrays.asList(x, x.add(ONE), x.subtract(ONE))) {
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samples.add(y);
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samples.add(y.negate());
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}
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}
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Random rng = new Random(1234567);
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for (int i = 0; i < 2000; i++) {
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samples.add(new BigInteger(rng.nextInt(2000), rng));
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}
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ALL_BIGINTEGER_CANDIDATES = Collections.unmodifiableList(samples);
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}
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public static int testDoubleValue() {
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System.out.println("--- testDoubleValue ---");
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int failures = 0;
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for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) {
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double expected = Double.parseDouble(big.toString());
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double actual = big.doubleValue();
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// should be bitwise identical
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if (Double.doubleToRawLongBits(expected) != Double
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.doubleToRawLongBits(actual)) {
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System.out.format("big: %s, expected: %f, actual: %f%n",
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big, expected, actual);
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failures++;
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}
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}
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return failures;
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}
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public static int testFloatValue() {
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System.out.println("--- testFloatValue ---");
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int failures = 0;
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for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) {
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float expected = Float.parseFloat(big.toString());
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float actual = big.floatValue();
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// should be bitwise identical
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if (Float.floatToRawIntBits(expected) != Float
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.floatToRawIntBits(actual)) {
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System.out.format("big: %s, expected: %f, actual: %f%n",
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big, expected, actual);
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failures++;
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}
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}
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return failures;
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}
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public static void main(String[] args) {
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int failures = testDoubleValue();
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failures += testFloatValue();
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if (failures > 0) {
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throw new RuntimeException("Incurred " + failures
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+ " failures while testing primitive conversions.");
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}
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}
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}
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