170 lines
4.8 KiB
Java
170 lines
4.8 KiB
Java
/*
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* Copyright (c) 2001, 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 4428772
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* @summary Testing recognition of "NaN" and "Infinity" strings
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* @author Joseph D. Darcy
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*/
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public class NaNInfinityParsing {
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/*
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* Regression tests for:
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* 4428772 -- Establish invariant for Float & Double classes and
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* their string representations
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*
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* Added capability for parse{Float, Double} and related methods
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* to recognize "NaN" and "Infinity" strings so that
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* parseDouble(toString(d)) will always return the original
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* floating-point value.
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*/
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static String NaNStrings[] = {
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"NaN",
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"+NaN",
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"-NaN"
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};
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static String infinityStrings[] = {
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"Infinity",
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"+Infinity",
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"-Infinity",
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};
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static String invalidStrings[] = {
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"+",
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"-",
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"@",
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"N",
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"Na",
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"Nan",
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"NaNf",
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"NaNd",
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"NaNF",
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"NaND",
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"+N",
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"+Na",
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"+Nan",
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"+NaNf",
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"+NaNd",
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"+NaNF",
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"+NaND",
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"-N",
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"-Na",
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"-Nan",
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"-NaNf",
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"-NaNd",
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"-NaNF",
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"-NaND",
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"I",
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"In",
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"Inf",
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"Infi",
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"Infin",
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"Infini",
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"Infinit",
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"InfinitY",
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"Infinityf",
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"InfinityF",
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"Infinityd",
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"InfinityD",
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"+I",
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"+In",
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"+Inf",
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"+Infi",
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"+Infin",
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"+Infini",
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"+Infinit",
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"+InfinitY",
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"+Infinityf",
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"+InfinityF",
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"+Infinityd",
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"+InfinityD",
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"-I",
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"-In",
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"-Inf",
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"-Infi",
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"-Infin",
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"-Infini",
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"-Infinit",
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"-InfinitY",
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"-Infinityf",
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"-InfinityF",
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"-Infinityd",
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"-InfinityD",
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"NaNInfinity",
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"InfinityNaN",
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"nan",
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"infinity"
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};
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public static void main(String [] argv) throws Exception {
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int i;
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double d;
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// Test valid NaN strings
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for(i = 0; i < NaNStrings.length; i++) {
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if(!Double.isNaN(d=Double.parseDouble(NaNStrings[i]))) {
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throw new RuntimeException("NaN string ``" + NaNStrings[i]
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+ "'' did not parse as a NaN; returned " +
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d + " instead.");
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}
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}
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// Test valid Infinity strings
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for(i = 0; i < infinityStrings.length; i++) {
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if(!Double.isInfinite(d=Double.parseDouble(infinityStrings[i]))) {
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throw new RuntimeException("Infinity string ``" +
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infinityStrings[i] +
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"'' did not parse as infinity; returned " +
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d + "instead.");
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}
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// check sign of result
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boolean negative = (infinityStrings[i].charAt(0) == '-');
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if(d != (negative?Double.NEGATIVE_INFINITY:
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Double.POSITIVE_INFINITY))
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throw new RuntimeException("Infinity has wrong sign;" +
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(negative?"positive instead of negative.":
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"negative instead of positive."));
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}
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// Test almost valid strings
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for(i = 0; i < invalidStrings.length; i++) {
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try {
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double result;
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d = Double.parseDouble(invalidStrings[i]);
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throw new RuntimeException("Invalid string ``" +
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invalidStrings[i]
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+"'' parsed as " + d + ".");
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}
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catch(NumberFormatException e) {
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// expected
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}
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}
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}
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}
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