| /* |
| * Copyright (c) 1998, 2013, 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. |
| */ |
| |
| import static java.math.BigInteger.ONE; |
| |
| import java.math.BigInteger; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Random; |
| |
| /** |
| * @test |
| * @bug 7131192 |
| * @summary This test ensures that BigInteger.floatValue() and |
| * BigInteger.doubleValue() behave correctly. |
| * @author Louis Wasserman |
| */ |
| public class PrimitiveConversionTests { |
| static final List<BigInteger> ALL_BIGINTEGER_CANDIDATES; |
| |
| static { |
| List<BigInteger> samples = new ArrayList<>(); |
| // Now add values near 2^N for lots of values of N. |
| for (int exponent : Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 31, 32, 33, |
| 34, 62, 63, 64, 65, 71, 72, 73, 79, 80, 81, 255, 256, 257, 511, |
| 512, 513, Double.MAX_EXPONENT - 1, Double.MAX_EXPONENT, |
| Double.MAX_EXPONENT + 1, 2000, 2001, 2002)) { |
| BigInteger x = ONE.shiftLeft(exponent); |
| for (BigInteger y : Arrays.asList(x, x.add(ONE), x.subtract(ONE))) { |
| samples.add(y); |
| samples.add(y.negate()); |
| } |
| } |
| |
| Random rng = new Random(1234567); |
| for (int i = 0; i < 2000; i++) { |
| samples.add(new BigInteger(rng.nextInt(2000), rng)); |
| } |
| |
| ALL_BIGINTEGER_CANDIDATES = Collections.unmodifiableList(samples); |
| } |
| |
| public static int testDoubleValue() { |
| int failures = 0; |
| for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) { |
| double expected = Double.parseDouble(big.toString()); |
| double actual = big.doubleValue(); |
| |
| // should be bitwise identical |
| if (Double.doubleToRawLongBits(expected) != Double |
| .doubleToRawLongBits(actual)) { |
| System.out.println(big); |
| failures++; |
| } |
| } |
| return failures; |
| } |
| |
| public static int testFloatValue() { |
| int failures = 0; |
| for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) { |
| float expected = Float.parseFloat(big.toString()); |
| float actual = big.floatValue(); |
| |
| // should be bitwise identical |
| if (Float.floatToRawIntBits(expected) != Float |
| .floatToRawIntBits(actual)) { |
| System.out.println(big + " " + expected + " " + actual); |
| failures++; |
| } |
| } |
| return failures; |
| } |
| |
| public static void main(String[] args) { |
| int failures = testDoubleValue(); |
| failures += testFloatValue(); |
| if (failures > 0) { |
| throw new RuntimeException("Incurred " + failures |
| + " failures while testing primitive conversions."); |
| } |
| } |
| } |