75 lines
2.6 KiB
Java
75 lines
2.6 KiB
Java
/*
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* Copyright (c) 2025, 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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* @bug 8356709
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* @summary Test Double.toString(double)
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* @run junit ValueOfDouble
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*/
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import org.junit.jupiter.api.Test;
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import java.math.BigDecimal;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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public class ValueOfDouble {
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private static final String DIGITS = "1234567000003456789"; // Enough digits to fill a long
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@Test
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public void testValueOfDouble() {
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checkValue(0.0);
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checkValue(-0.0);
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checkValue(Math.PI);
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checkValue(-Math.PI);
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checkValue(Double.MAX_VALUE);
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checkValue(Double.MIN_VALUE);
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checkValue(1e-44); // Lots of digits with lots of 9s
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for (int prec = 1; prec < DIGITS.length(); prec++) {
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String prefix = DIGITS.substring(0, prec);
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for (int exp = -30; exp < 30; exp++) {
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double value = Double.parseDouble(prefix + "e" + exp);
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checkValue(value);
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checkValue(-value);
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}
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}
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}
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private static void checkValue(double value) {
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BigDecimal expected = new BigDecimal(Double.toString(value));
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assertEquals(expected, BigDecimal.valueOf(value));
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}
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@Test
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public void testExceptions() {
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assertThrows(NumberFormatException.class, () -> BigDecimal.valueOf(Double.NaN));
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assertThrows(NumberFormatException.class, () -> BigDecimal.valueOf(Double.POSITIVE_INFINITY));
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assertThrows(NumberFormatException.class, () -> BigDecimal.valueOf(Double.NEGATIVE_INFINITY));
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}
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}
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