1.1 --- a/emul/mini/src/main/java/java/lang/Float.java Tue Feb 26 14:55:55 2013 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,909 +0,0 @@
1.4 -/*
1.5 - * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 - *
1.8 - * This code is free software; you can redistribute it and/or modify it
1.9 - * under the terms of the GNU General Public License version 2 only, as
1.10 - * published by the Free Software Foundation. Oracle designates this
1.11 - * particular file as subject to the "Classpath" exception as provided
1.12 - * by Oracle in the LICENSE file that accompanied this code.
1.13 - *
1.14 - * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 - * version 2 for more details (a copy is included in the LICENSE file that
1.18 - * accompanied this code).
1.19 - *
1.20 - * You should have received a copy of the GNU General Public License version
1.21 - * 2 along with this work; if not, write to the Free Software Foundation,
1.22 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 - *
1.24 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 - * or visit www.oracle.com if you need additional information or have any
1.26 - * questions.
1.27 - */
1.28 -
1.29 -package java.lang;
1.30 -
1.31 -import org.apidesign.bck2brwsr.core.JavaScriptBody;
1.32 -
1.33 -/**
1.34 - * The {@code Float} class wraps a value of primitive type
1.35 - * {@code float} in an object. An object of type
1.36 - * {@code Float} contains a single field whose type is
1.37 - * {@code float}.
1.38 - *
1.39 - * <p>In addition, this class provides several methods for converting a
1.40 - * {@code float} to a {@code String} and a
1.41 - * {@code String} to a {@code float}, as well as other
1.42 - * constants and methods useful when dealing with a
1.43 - * {@code float}.
1.44 - *
1.45 - * @author Lee Boynton
1.46 - * @author Arthur van Hoff
1.47 - * @author Joseph D. Darcy
1.48 - * @since JDK1.0
1.49 - */
1.50 -public final class Float extends Number implements Comparable<Float> {
1.51 - /**
1.52 - * A constant holding the positive infinity of type
1.53 - * {@code float}. It is equal to the value returned by
1.54 - * {@code Float.intBitsToFloat(0x7f800000)}.
1.55 - */
1.56 - public static final float POSITIVE_INFINITY = 1.0f / 0.0f;
1.57 -
1.58 - /**
1.59 - * A constant holding the negative infinity of type
1.60 - * {@code float}. It is equal to the value returned by
1.61 - * {@code Float.intBitsToFloat(0xff800000)}.
1.62 - */
1.63 - public static final float NEGATIVE_INFINITY = -1.0f / 0.0f;
1.64 -
1.65 - /**
1.66 - * A constant holding a Not-a-Number (NaN) value of type
1.67 - * {@code float}. It is equivalent to the value returned by
1.68 - * {@code Float.intBitsToFloat(0x7fc00000)}.
1.69 - */
1.70 - public static final float NaN = 0.0f / 0.0f;
1.71 -
1.72 - /**
1.73 - * A constant holding the largest positive finite value of type
1.74 - * {@code float}, (2-2<sup>-23</sup>)·2<sup>127</sup>.
1.75 - * It is equal to the hexadecimal floating-point literal
1.76 - * {@code 0x1.fffffeP+127f} and also equal to
1.77 - * {@code Float.intBitsToFloat(0x7f7fffff)}.
1.78 - */
1.79 - public static final float MAX_VALUE = 0x1.fffffeP+127f; // 3.4028235e+38f
1.80 -
1.81 - /**
1.82 - * A constant holding the smallest positive normal value of type
1.83 - * {@code float}, 2<sup>-126</sup>. It is equal to the
1.84 - * hexadecimal floating-point literal {@code 0x1.0p-126f} and also
1.85 - * equal to {@code Float.intBitsToFloat(0x00800000)}.
1.86 - *
1.87 - * @since 1.6
1.88 - */
1.89 - public static final float MIN_NORMAL = 0x1.0p-126f; // 1.17549435E-38f
1.90 -
1.91 - /**
1.92 - * A constant holding the smallest positive nonzero value of type
1.93 - * {@code float}, 2<sup>-149</sup>. It is equal to the
1.94 - * hexadecimal floating-point literal {@code 0x0.000002P-126f}
1.95 - * and also equal to {@code Float.intBitsToFloat(0x1)}.
1.96 - */
1.97 - public static final float MIN_VALUE = 0x0.000002P-126f; // 1.4e-45f
1.98 -
1.99 - /**
1.100 - * Maximum exponent a finite {@code float} variable may have. It
1.101 - * is equal to the value returned by {@code
1.102 - * Math.getExponent(Float.MAX_VALUE)}.
1.103 - *
1.104 - * @since 1.6
1.105 - */
1.106 - public static final int MAX_EXPONENT = 127;
1.107 -
1.108 - /**
1.109 - * Minimum exponent a normalized {@code float} variable may have.
1.110 - * It is equal to the value returned by {@code
1.111 - * Math.getExponent(Float.MIN_NORMAL)}.
1.112 - *
1.113 - * @since 1.6
1.114 - */
1.115 - public static final int MIN_EXPONENT = -126;
1.116 -
1.117 - /**
1.118 - * The number of bits used to represent a {@code float} value.
1.119 - *
1.120 - * @since 1.5
1.121 - */
1.122 - public static final int SIZE = 32;
1.123 -
1.124 - /**
1.125 - * The {@code Class} instance representing the primitive type
1.126 - * {@code float}.
1.127 - *
1.128 - * @since JDK1.1
1.129 - */
1.130 - public static final Class<Float> TYPE = Class.getPrimitiveClass("float");
1.131 -
1.132 - /**
1.133 - * Returns a string representation of the {@code float}
1.134 - * argument. All characters mentioned below are ASCII characters.
1.135 - * <ul>
1.136 - * <li>If the argument is NaN, the result is the string
1.137 - * "{@code NaN}".
1.138 - * <li>Otherwise, the result is a string that represents the sign and
1.139 - * magnitude (absolute value) of the argument. If the sign is
1.140 - * negative, the first character of the result is
1.141 - * '{@code -}' (<code>'\u002D'</code>); if the sign is
1.142 - * positive, no sign character appears in the result. As for
1.143 - * the magnitude <i>m</i>:
1.144 - * <ul>
1.145 - * <li>If <i>m</i> is infinity, it is represented by the characters
1.146 - * {@code "Infinity"}; thus, positive infinity produces
1.147 - * the result {@code "Infinity"} and negative infinity
1.148 - * produces the result {@code "-Infinity"}.
1.149 - * <li>If <i>m</i> is zero, it is represented by the characters
1.150 - * {@code "0.0"}; thus, negative zero produces the result
1.151 - * {@code "-0.0"} and positive zero produces the result
1.152 - * {@code "0.0"}.
1.153 - * <li> If <i>m</i> is greater than or equal to 10<sup>-3</sup> but
1.154 - * less than 10<sup>7</sup>, then it is represented as the
1.155 - * integer part of <i>m</i>, in decimal form with no leading
1.156 - * zeroes, followed by '{@code .}'
1.157 - * (<code>'\u002E'</code>), followed by one or more
1.158 - * decimal digits representing the fractional part of
1.159 - * <i>m</i>.
1.160 - * <li> If <i>m</i> is less than 10<sup>-3</sup> or greater than or
1.161 - * equal to 10<sup>7</sup>, then it is represented in
1.162 - * so-called "computerized scientific notation." Let <i>n</i>
1.163 - * be the unique integer such that 10<sup><i>n</i> </sup>≤
1.164 - * <i>m</i> {@literal <} 10<sup><i>n</i>+1</sup>; then let <i>a</i>
1.165 - * be the mathematically exact quotient of <i>m</i> and
1.166 - * 10<sup><i>n</i></sup> so that 1 ≤ <i>a</i> {@literal <} 10.
1.167 - * The magnitude is then represented as the integer part of
1.168 - * <i>a</i>, as a single decimal digit, followed by
1.169 - * '{@code .}' (<code>'\u002E'</code>), followed by
1.170 - * decimal digits representing the fractional part of
1.171 - * <i>a</i>, followed by the letter '{@code E}'
1.172 - * (<code>'\u0045'</code>), followed by a representation
1.173 - * of <i>n</i> as a decimal integer, as produced by the
1.174 - * method {@link java.lang.Integer#toString(int)}.
1.175 - *
1.176 - * </ul>
1.177 - * </ul>
1.178 - * How many digits must be printed for the fractional part of
1.179 - * <i>m</i> or <i>a</i>? There must be at least one digit
1.180 - * to represent the fractional part, and beyond that as many, but
1.181 - * only as many, more digits as are needed to uniquely distinguish
1.182 - * the argument value from adjacent values of type
1.183 - * {@code float}. That is, suppose that <i>x</i> is the
1.184 - * exact mathematical value represented by the decimal
1.185 - * representation produced by this method for a finite nonzero
1.186 - * argument <i>f</i>. Then <i>f</i> must be the {@code float}
1.187 - * value nearest to <i>x</i>; or, if two {@code float} values are
1.188 - * equally close to <i>x</i>, then <i>f</i> must be one of
1.189 - * them and the least significant bit of the significand of
1.190 - * <i>f</i> must be {@code 0}.
1.191 - *
1.192 - * <p>To create localized string representations of a floating-point
1.193 - * value, use subclasses of {@link java.text.NumberFormat}.
1.194 - *
1.195 - * @param f the float to be converted.
1.196 - * @return a string representation of the argument.
1.197 - */
1.198 - public static String toString(float f) {
1.199 - return Double.toString(f);
1.200 - }
1.201 -
1.202 - /**
1.203 - * Returns a hexadecimal string representation of the
1.204 - * {@code float} argument. All characters mentioned below are
1.205 - * ASCII characters.
1.206 - *
1.207 - * <ul>
1.208 - * <li>If the argument is NaN, the result is the string
1.209 - * "{@code NaN}".
1.210 - * <li>Otherwise, the result is a string that represents the sign and
1.211 - * magnitude (absolute value) of the argument. If the sign is negative,
1.212 - * the first character of the result is '{@code -}'
1.213 - * (<code>'\u002D'</code>); if the sign is positive, no sign character
1.214 - * appears in the result. As for the magnitude <i>m</i>:
1.215 - *
1.216 - * <ul>
1.217 - * <li>If <i>m</i> is infinity, it is represented by the string
1.218 - * {@code "Infinity"}; thus, positive infinity produces the
1.219 - * result {@code "Infinity"} and negative infinity produces
1.220 - * the result {@code "-Infinity"}.
1.221 - *
1.222 - * <li>If <i>m</i> is zero, it is represented by the string
1.223 - * {@code "0x0.0p0"}; thus, negative zero produces the result
1.224 - * {@code "-0x0.0p0"} and positive zero produces the result
1.225 - * {@code "0x0.0p0"}.
1.226 - *
1.227 - * <li>If <i>m</i> is a {@code float} value with a
1.228 - * normalized representation, substrings are used to represent the
1.229 - * significand and exponent fields. The significand is
1.230 - * represented by the characters {@code "0x1."}
1.231 - * followed by a lowercase hexadecimal representation of the rest
1.232 - * of the significand as a fraction. Trailing zeros in the
1.233 - * hexadecimal representation are removed unless all the digits
1.234 - * are zero, in which case a single zero is used. Next, the
1.235 - * exponent is represented by {@code "p"} followed
1.236 - * by a decimal string of the unbiased exponent as if produced by
1.237 - * a call to {@link Integer#toString(int) Integer.toString} on the
1.238 - * exponent value.
1.239 - *
1.240 - * <li>If <i>m</i> is a {@code float} value with a subnormal
1.241 - * representation, the significand is represented by the
1.242 - * characters {@code "0x0."} followed by a
1.243 - * hexadecimal representation of the rest of the significand as a
1.244 - * fraction. Trailing zeros in the hexadecimal representation are
1.245 - * removed. Next, the exponent is represented by
1.246 - * {@code "p-126"}. Note that there must be at
1.247 - * least one nonzero digit in a subnormal significand.
1.248 - *
1.249 - * </ul>
1.250 - *
1.251 - * </ul>
1.252 - *
1.253 - * <table border>
1.254 - * <caption><h3>Examples</h3></caption>
1.255 - * <tr><th>Floating-point Value</th><th>Hexadecimal String</th>
1.256 - * <tr><td>{@code 1.0}</td> <td>{@code 0x1.0p0}</td>
1.257 - * <tr><td>{@code -1.0}</td> <td>{@code -0x1.0p0}</td>
1.258 - * <tr><td>{@code 2.0}</td> <td>{@code 0x1.0p1}</td>
1.259 - * <tr><td>{@code 3.0}</td> <td>{@code 0x1.8p1}</td>
1.260 - * <tr><td>{@code 0.5}</td> <td>{@code 0x1.0p-1}</td>
1.261 - * <tr><td>{@code 0.25}</td> <td>{@code 0x1.0p-2}</td>
1.262 - * <tr><td>{@code Float.MAX_VALUE}</td>
1.263 - * <td>{@code 0x1.fffffep127}</td>
1.264 - * <tr><td>{@code Minimum Normal Value}</td>
1.265 - * <td>{@code 0x1.0p-126}</td>
1.266 - * <tr><td>{@code Maximum Subnormal Value}</td>
1.267 - * <td>{@code 0x0.fffffep-126}</td>
1.268 - * <tr><td>{@code Float.MIN_VALUE}</td>
1.269 - * <td>{@code 0x0.000002p-126}</td>
1.270 - * </table>
1.271 - * @param f the {@code float} to be converted.
1.272 - * @return a hex string representation of the argument.
1.273 - * @since 1.5
1.274 - * @author Joseph D. Darcy
1.275 - */
1.276 - public static String toHexString(float f) {
1.277 - throw new UnsupportedOperationException();
1.278 -// if (Math.abs(f) < FloatConsts.MIN_NORMAL
1.279 -// && f != 0.0f ) {// float subnormal
1.280 -// // Adjust exponent to create subnormal double, then
1.281 -// // replace subnormal double exponent with subnormal float
1.282 -// // exponent
1.283 -// String s = Double.toHexString(FpUtils.scalb((double)f,
1.284 -// /* -1022+126 */
1.285 -// DoubleConsts.MIN_EXPONENT-
1.286 -// FloatConsts.MIN_EXPONENT));
1.287 -// return s.replaceFirst("p-1022$", "p-126");
1.288 -// }
1.289 -// else // double string will be the same as float string
1.290 -// return Double.toHexString(f);
1.291 - }
1.292 -
1.293 - /**
1.294 - * Returns a {@code Float} object holding the
1.295 - * {@code float} value represented by the argument string
1.296 - * {@code s}.
1.297 - *
1.298 - * <p>If {@code s} is {@code null}, then a
1.299 - * {@code NullPointerException} is thrown.
1.300 - *
1.301 - * <p>Leading and trailing whitespace characters in {@code s}
1.302 - * are ignored. Whitespace is removed as if by the {@link
1.303 - * String#trim} method; that is, both ASCII space and control
1.304 - * characters are removed. The rest of {@code s} should
1.305 - * constitute a <i>FloatValue</i> as described by the lexical
1.306 - * syntax rules:
1.307 - *
1.308 - * <blockquote>
1.309 - * <dl>
1.310 - * <dt><i>FloatValue:</i>
1.311 - * <dd><i>Sign<sub>opt</sub></i> {@code NaN}
1.312 - * <dd><i>Sign<sub>opt</sub></i> {@code Infinity}
1.313 - * <dd><i>Sign<sub>opt</sub> FloatingPointLiteral</i>
1.314 - * <dd><i>Sign<sub>opt</sub> HexFloatingPointLiteral</i>
1.315 - * <dd><i>SignedInteger</i>
1.316 - * </dl>
1.317 - *
1.318 - * <p>
1.319 - *
1.320 - * <dl>
1.321 - * <dt><i>HexFloatingPointLiteral</i>:
1.322 - * <dd> <i>HexSignificand BinaryExponent FloatTypeSuffix<sub>opt</sub></i>
1.323 - * </dl>
1.324 - *
1.325 - * <p>
1.326 - *
1.327 - * <dl>
1.328 - * <dt><i>HexSignificand:</i>
1.329 - * <dd><i>HexNumeral</i>
1.330 - * <dd><i>HexNumeral</i> {@code .}
1.331 - * <dd>{@code 0x} <i>HexDigits<sub>opt</sub>
1.332 - * </i>{@code .}<i> HexDigits</i>
1.333 - * <dd>{@code 0X}<i> HexDigits<sub>opt</sub>
1.334 - * </i>{@code .} <i>HexDigits</i>
1.335 - * </dl>
1.336 - *
1.337 - * <p>
1.338 - *
1.339 - * <dl>
1.340 - * <dt><i>BinaryExponent:</i>
1.341 - * <dd><i>BinaryExponentIndicator SignedInteger</i>
1.342 - * </dl>
1.343 - *
1.344 - * <p>
1.345 - *
1.346 - * <dl>
1.347 - * <dt><i>BinaryExponentIndicator:</i>
1.348 - * <dd>{@code p}
1.349 - * <dd>{@code P}
1.350 - * </dl>
1.351 - *
1.352 - * </blockquote>
1.353 - *
1.354 - * where <i>Sign</i>, <i>FloatingPointLiteral</i>,
1.355 - * <i>HexNumeral</i>, <i>HexDigits</i>, <i>SignedInteger</i> and
1.356 - * <i>FloatTypeSuffix</i> are as defined in the lexical structure
1.357 - * sections of
1.358 - * <cite>The Java™ Language Specification</cite>,
1.359 - * except that underscores are not accepted between digits.
1.360 - * If {@code s} does not have the form of
1.361 - * a <i>FloatValue</i>, then a {@code NumberFormatException}
1.362 - * is thrown. Otherwise, {@code s} is regarded as
1.363 - * representing an exact decimal value in the usual
1.364 - * "computerized scientific notation" or as an exact
1.365 - * hexadecimal value; this exact numerical value is then
1.366 - * conceptually converted to an "infinitely precise"
1.367 - * binary value that is then rounded to type {@code float}
1.368 - * by the usual round-to-nearest rule of IEEE 754 floating-point
1.369 - * arithmetic, which includes preserving the sign of a zero
1.370 - * value.
1.371 - *
1.372 - * Note that the round-to-nearest rule also implies overflow and
1.373 - * underflow behaviour; if the exact value of {@code s} is large
1.374 - * enough in magnitude (greater than or equal to ({@link
1.375 - * #MAX_VALUE} + {@link Math#ulp(float) ulp(MAX_VALUE)}/2),
1.376 - * rounding to {@code float} will result in an infinity and if the
1.377 - * exact value of {@code s} is small enough in magnitude (less
1.378 - * than or equal to {@link #MIN_VALUE}/2), rounding to float will
1.379 - * result in a zero.
1.380 - *
1.381 - * Finally, after rounding a {@code Float} object representing
1.382 - * this {@code float} value is returned.
1.383 - *
1.384 - * <p>To interpret localized string representations of a
1.385 - * floating-point value, use subclasses of {@link
1.386 - * java.text.NumberFormat}.
1.387 - *
1.388 - * <p>Note that trailing format specifiers, specifiers that
1.389 - * determine the type of a floating-point literal
1.390 - * ({@code 1.0f} is a {@code float} value;
1.391 - * {@code 1.0d} is a {@code double} value), do
1.392 - * <em>not</em> influence the results of this method. In other
1.393 - * words, the numerical value of the input string is converted
1.394 - * directly to the target floating-point type. In general, the
1.395 - * two-step sequence of conversions, string to {@code double}
1.396 - * followed by {@code double} to {@code float}, is
1.397 - * <em>not</em> equivalent to converting a string directly to
1.398 - * {@code float}. For example, if first converted to an
1.399 - * intermediate {@code double} and then to
1.400 - * {@code float}, the string<br>
1.401 - * {@code "1.00000017881393421514957253748434595763683319091796875001d"}<br>
1.402 - * results in the {@code float} value
1.403 - * {@code 1.0000002f}; if the string is converted directly to
1.404 - * {@code float}, <code>1.000000<b>1</b>f</code> results.
1.405 - *
1.406 - * <p>To avoid calling this method on an invalid string and having
1.407 - * a {@code NumberFormatException} be thrown, the documentation
1.408 - * for {@link Double#valueOf Double.valueOf} lists a regular
1.409 - * expression which can be used to screen the input.
1.410 - *
1.411 - * @param s the string to be parsed.
1.412 - * @return a {@code Float} object holding the value
1.413 - * represented by the {@code String} argument.
1.414 - * @throws NumberFormatException if the string does not contain a
1.415 - * parsable number.
1.416 - */
1.417 - public static Float valueOf(String s) throws NumberFormatException {
1.418 - throw new UnsupportedOperationException();
1.419 -// return new Float(FloatingDecimal.readJavaFormatString(s).floatValue());
1.420 - }
1.421 -
1.422 - /**
1.423 - * Returns a {@code Float} instance representing the specified
1.424 - * {@code float} value.
1.425 - * If a new {@code Float} instance is not required, this method
1.426 - * should generally be used in preference to the constructor
1.427 - * {@link #Float(float)}, as this method is likely to yield
1.428 - * significantly better space and time performance by caching
1.429 - * frequently requested values.
1.430 - *
1.431 - * @param f a float value.
1.432 - * @return a {@code Float} instance representing {@code f}.
1.433 - * @since 1.5
1.434 - */
1.435 - public static Float valueOf(float f) {
1.436 - return new Float(f);
1.437 - }
1.438 -
1.439 - /**
1.440 - * Returns a new {@code float} initialized to the value
1.441 - * represented by the specified {@code String}, as performed
1.442 - * by the {@code valueOf} method of class {@code Float}.
1.443 - *
1.444 - * @param s the string to be parsed.
1.445 - * @return the {@code float} value represented by the string
1.446 - * argument.
1.447 - * @throws NullPointerException if the string is null
1.448 - * @throws NumberFormatException if the string does not contain a
1.449 - * parsable {@code float}.
1.450 - * @see java.lang.Float#valueOf(String)
1.451 - * @since 1.2
1.452 - */
1.453 - public static float parseFloat(String s) throws NumberFormatException {
1.454 - throw new UnsupportedOperationException();
1.455 -// return FloatingDecimal.readJavaFormatString(s).floatValue();
1.456 - }
1.457 -
1.458 - /**
1.459 - * Returns {@code true} if the specified number is a
1.460 - * Not-a-Number (NaN) value, {@code false} otherwise.
1.461 - *
1.462 - * @param v the value to be tested.
1.463 - * @return {@code true} if the argument is NaN;
1.464 - * {@code false} otherwise.
1.465 - */
1.466 - static public boolean isNaN(float v) {
1.467 - return (v != v);
1.468 - }
1.469 -
1.470 - /**
1.471 - * Returns {@code true} if the specified number is infinitely
1.472 - * large in magnitude, {@code false} otherwise.
1.473 - *
1.474 - * @param v the value to be tested.
1.475 - * @return {@code true} if the argument is positive infinity or
1.476 - * negative infinity; {@code false} otherwise.
1.477 - */
1.478 - static public boolean isInfinite(float v) {
1.479 - return (v == POSITIVE_INFINITY) || (v == NEGATIVE_INFINITY);
1.480 - }
1.481 -
1.482 - /**
1.483 - * The value of the Float.
1.484 - *
1.485 - * @serial
1.486 - */
1.487 - private final float value;
1.488 -
1.489 - /**
1.490 - * Constructs a newly allocated {@code Float} object that
1.491 - * represents the primitive {@code float} argument.
1.492 - *
1.493 - * @param value the value to be represented by the {@code Float}.
1.494 - */
1.495 - public Float(float value) {
1.496 - this.value = value;
1.497 - }
1.498 -
1.499 - /**
1.500 - * Constructs a newly allocated {@code Float} object that
1.501 - * represents the argument converted to type {@code float}.
1.502 - *
1.503 - * @param value the value to be represented by the {@code Float}.
1.504 - */
1.505 - public Float(double value) {
1.506 - this.value = (float)value;
1.507 - }
1.508 -
1.509 - /**
1.510 - * Constructs a newly allocated {@code Float} object that
1.511 - * represents the floating-point value of type {@code float}
1.512 - * represented by the string. The string is converted to a
1.513 - * {@code float} value as if by the {@code valueOf} method.
1.514 - *
1.515 - * @param s a string to be converted to a {@code Float}.
1.516 - * @throws NumberFormatException if the string does not contain a
1.517 - * parsable number.
1.518 - * @see java.lang.Float#valueOf(java.lang.String)
1.519 - */
1.520 - public Float(String s) throws NumberFormatException {
1.521 - // REMIND: this is inefficient
1.522 - this(valueOf(s).floatValue());
1.523 - }
1.524 -
1.525 - /**
1.526 - * Returns {@code true} if this {@code Float} value is a
1.527 - * Not-a-Number (NaN), {@code false} otherwise.
1.528 - *
1.529 - * @return {@code true} if the value represented by this object is
1.530 - * NaN; {@code false} otherwise.
1.531 - */
1.532 - public boolean isNaN() {
1.533 - return isNaN(value);
1.534 - }
1.535 -
1.536 - /**
1.537 - * Returns {@code true} if this {@code Float} value is
1.538 - * infinitely large in magnitude, {@code false} otherwise.
1.539 - *
1.540 - * @return {@code true} if the value represented by this object is
1.541 - * positive infinity or negative infinity;
1.542 - * {@code false} otherwise.
1.543 - */
1.544 - public boolean isInfinite() {
1.545 - return isInfinite(value);
1.546 - }
1.547 -
1.548 - /**
1.549 - * Returns a string representation of this {@code Float} object.
1.550 - * The primitive {@code float} value represented by this object
1.551 - * is converted to a {@code String} exactly as if by the method
1.552 - * {@code toString} of one argument.
1.553 - *
1.554 - * @return a {@code String} representation of this object.
1.555 - * @see java.lang.Float#toString(float)
1.556 - */
1.557 - public String toString() {
1.558 - return Float.toString(value);
1.559 - }
1.560 -
1.561 - /**
1.562 - * Returns the value of this {@code Float} as a {@code byte} (by
1.563 - * casting to a {@code byte}).
1.564 - *
1.565 - * @return the {@code float} value represented by this object
1.566 - * converted to type {@code byte}
1.567 - */
1.568 - public byte byteValue() {
1.569 - return (byte)value;
1.570 - }
1.571 -
1.572 - /**
1.573 - * Returns the value of this {@code Float} as a {@code short} (by
1.574 - * casting to a {@code short}).
1.575 - *
1.576 - * @return the {@code float} value represented by this object
1.577 - * converted to type {@code short}
1.578 - * @since JDK1.1
1.579 - */
1.580 - public short shortValue() {
1.581 - return (short)value;
1.582 - }
1.583 -
1.584 - /**
1.585 - * Returns the value of this {@code Float} as an {@code int} (by
1.586 - * casting to type {@code int}).
1.587 - *
1.588 - * @return the {@code float} value represented by this object
1.589 - * converted to type {@code int}
1.590 - */
1.591 - public int intValue() {
1.592 - return (int)value;
1.593 - }
1.594 -
1.595 - /**
1.596 - * Returns value of this {@code Float} as a {@code long} (by
1.597 - * casting to type {@code long}).
1.598 - *
1.599 - * @return the {@code float} value represented by this object
1.600 - * converted to type {@code long}
1.601 - */
1.602 - public long longValue() {
1.603 - return (long)value;
1.604 - }
1.605 -
1.606 - /**
1.607 - * Returns the {@code float} value of this {@code Float} object.
1.608 - *
1.609 - * @return the {@code float} value represented by this object
1.610 - */
1.611 - public float floatValue() {
1.612 - return value;
1.613 - }
1.614 -
1.615 - /**
1.616 - * Returns the {@code double} value of this {@code Float} object.
1.617 - *
1.618 - * @return the {@code float} value represented by this
1.619 - * object is converted to type {@code double} and the
1.620 - * result of the conversion is returned.
1.621 - */
1.622 - public double doubleValue() {
1.623 - return (double)value;
1.624 - }
1.625 -
1.626 - /**
1.627 - * Returns a hash code for this {@code Float} object. The
1.628 - * result is the integer bit representation, exactly as produced
1.629 - * by the method {@link #floatToIntBits(float)}, of the primitive
1.630 - * {@code float} value represented by this {@code Float}
1.631 - * object.
1.632 - *
1.633 - * @return a hash code value for this object.
1.634 - */
1.635 - public int hashCode() {
1.636 - return floatToIntBits(value);
1.637 - }
1.638 -
1.639 - /**
1.640 -
1.641 - * Compares this object against the specified object. The result
1.642 - * is {@code true} if and only if the argument is not
1.643 - * {@code null} and is a {@code Float} object that
1.644 - * represents a {@code float} with the same value as the
1.645 - * {@code float} represented by this object. For this
1.646 - * purpose, two {@code float} values are considered to be the
1.647 - * same if and only if the method {@link #floatToIntBits(float)}
1.648 - * returns the identical {@code int} value when applied to
1.649 - * each.
1.650 - *
1.651 - * <p>Note that in most cases, for two instances of class
1.652 - * {@code Float}, {@code f1} and {@code f2}, the value
1.653 - * of {@code f1.equals(f2)} is {@code true} if and only if
1.654 - *
1.655 - * <blockquote><pre>
1.656 - * f1.floatValue() == f2.floatValue()
1.657 - * </pre></blockquote>
1.658 - *
1.659 - * <p>also has the value {@code true}. However, there are two exceptions:
1.660 - * <ul>
1.661 - * <li>If {@code f1} and {@code f2} both represent
1.662 - * {@code Float.NaN}, then the {@code equals} method returns
1.663 - * {@code true}, even though {@code Float.NaN==Float.NaN}
1.664 - * has the value {@code false}.
1.665 - * <li>If {@code f1} represents {@code +0.0f} while
1.666 - * {@code f2} represents {@code -0.0f}, or vice
1.667 - * versa, the {@code equal} test has the value
1.668 - * {@code false}, even though {@code 0.0f==-0.0f}
1.669 - * has the value {@code true}.
1.670 - * </ul>
1.671 - *
1.672 - * This definition allows hash tables to operate properly.
1.673 - *
1.674 - * @param obj the object to be compared
1.675 - * @return {@code true} if the objects are the same;
1.676 - * {@code false} otherwise.
1.677 - * @see java.lang.Float#floatToIntBits(float)
1.678 - */
1.679 - public boolean equals(Object obj) {
1.680 - return (obj instanceof Float)
1.681 - && (floatToIntBits(((Float)obj).value) == floatToIntBits(value));
1.682 - }
1.683 -
1.684 - /**
1.685 - * Returns a representation of the specified floating-point value
1.686 - * according to the IEEE 754 floating-point "single format" bit
1.687 - * layout.
1.688 - *
1.689 - * <p>Bit 31 (the bit that is selected by the mask
1.690 - * {@code 0x80000000}) represents the sign of the floating-point
1.691 - * number.
1.692 - * Bits 30-23 (the bits that are selected by the mask
1.693 - * {@code 0x7f800000}) represent the exponent.
1.694 - * Bits 22-0 (the bits that are selected by the mask
1.695 - * {@code 0x007fffff}) represent the significand (sometimes called
1.696 - * the mantissa) of the floating-point number.
1.697 - *
1.698 - * <p>If the argument is positive infinity, the result is
1.699 - * {@code 0x7f800000}.
1.700 - *
1.701 - * <p>If the argument is negative infinity, the result is
1.702 - * {@code 0xff800000}.
1.703 - *
1.704 - * <p>If the argument is NaN, the result is {@code 0x7fc00000}.
1.705 - *
1.706 - * <p>In all cases, the result is an integer that, when given to the
1.707 - * {@link #intBitsToFloat(int)} method, will produce a floating-point
1.708 - * value the same as the argument to {@code floatToIntBits}
1.709 - * (except all NaN values are collapsed to a single
1.710 - * "canonical" NaN value).
1.711 - *
1.712 - * @param value a floating-point number.
1.713 - * @return the bits that represent the floating-point number.
1.714 - */
1.715 - public static int floatToIntBits(float value) {
1.716 - throw new UnsupportedOperationException();
1.717 -// int result = floatToRawIntBits(value);
1.718 -// // Check for NaN based on values of bit fields, maximum
1.719 -// // exponent and nonzero significand.
1.720 -// if ( ((result & FloatConsts.EXP_BIT_MASK) ==
1.721 -// FloatConsts.EXP_BIT_MASK) &&
1.722 -// (result & FloatConsts.SIGNIF_BIT_MASK) != 0)
1.723 -// result = 0x7fc00000;
1.724 -// return result;
1.725 - }
1.726 -
1.727 - /**
1.728 - * Returns a representation of the specified floating-point value
1.729 - * according to the IEEE 754 floating-point "single format" bit
1.730 - * layout, preserving Not-a-Number (NaN) values.
1.731 - *
1.732 - * <p>Bit 31 (the bit that is selected by the mask
1.733 - * {@code 0x80000000}) represents the sign of the floating-point
1.734 - * number.
1.735 - * Bits 30-23 (the bits that are selected by the mask
1.736 - * {@code 0x7f800000}) represent the exponent.
1.737 - * Bits 22-0 (the bits that are selected by the mask
1.738 - * {@code 0x007fffff}) represent the significand (sometimes called
1.739 - * the mantissa) of the floating-point number.
1.740 - *
1.741 - * <p>If the argument is positive infinity, the result is
1.742 - * {@code 0x7f800000}.
1.743 - *
1.744 - * <p>If the argument is negative infinity, the result is
1.745 - * {@code 0xff800000}.
1.746 - *
1.747 - * <p>If the argument is NaN, the result is the integer representing
1.748 - * the actual NaN value. Unlike the {@code floatToIntBits}
1.749 - * method, {@code floatToRawIntBits} does not collapse all the
1.750 - * bit patterns encoding a NaN to a single "canonical"
1.751 - * NaN value.
1.752 - *
1.753 - * <p>In all cases, the result is an integer that, when given to the
1.754 - * {@link #intBitsToFloat(int)} method, will produce a
1.755 - * floating-point value the same as the argument to
1.756 - * {@code floatToRawIntBits}.
1.757 - *
1.758 - * @param value a floating-point number.
1.759 - * @return the bits that represent the floating-point number.
1.760 - * @since 1.3
1.761 - */
1.762 - public static native int floatToRawIntBits(float value);
1.763 -
1.764 - /**
1.765 - * Returns the {@code float} value corresponding to a given
1.766 - * bit representation.
1.767 - * The argument is considered to be a representation of a
1.768 - * floating-point value according to the IEEE 754 floating-point
1.769 - * "single format" bit layout.
1.770 - *
1.771 - * <p>If the argument is {@code 0x7f800000}, the result is positive
1.772 - * infinity.
1.773 - *
1.774 - * <p>If the argument is {@code 0xff800000}, the result is negative
1.775 - * infinity.
1.776 - *
1.777 - * <p>If the argument is any value in the range
1.778 - * {@code 0x7f800001} through {@code 0x7fffffff} or in
1.779 - * the range {@code 0xff800001} through
1.780 - * {@code 0xffffffff}, the result is a NaN. No IEEE 754
1.781 - * floating-point operation provided by Java can distinguish
1.782 - * between two NaN values of the same type with different bit
1.783 - * patterns. Distinct values of NaN are only distinguishable by
1.784 - * use of the {@code Float.floatToRawIntBits} method.
1.785 - *
1.786 - * <p>In all other cases, let <i>s</i>, <i>e</i>, and <i>m</i> be three
1.787 - * values that can be computed from the argument:
1.788 - *
1.789 - * <blockquote><pre>
1.790 - * int s = ((bits >> 31) == 0) ? 1 : -1;
1.791 - * int e = ((bits >> 23) & 0xff);
1.792 - * int m = (e == 0) ?
1.793 - * (bits & 0x7fffff) << 1 :
1.794 - * (bits & 0x7fffff) | 0x800000;
1.795 - * </pre></blockquote>
1.796 - *
1.797 - * Then the floating-point result equals the value of the mathematical
1.798 - * expression <i>s</i>·<i>m</i>·2<sup><i>e</i>-150</sup>.
1.799 - *
1.800 - * <p>Note that this method may not be able to return a
1.801 - * {@code float} NaN with exactly same bit pattern as the
1.802 - * {@code int} argument. IEEE 754 distinguishes between two
1.803 - * kinds of NaNs, quiet NaNs and <i>signaling NaNs</i>. The
1.804 - * differences between the two kinds of NaN are generally not
1.805 - * visible in Java. Arithmetic operations on signaling NaNs turn
1.806 - * them into quiet NaNs with a different, but often similar, bit
1.807 - * pattern. However, on some processors merely copying a
1.808 - * signaling NaN also performs that conversion. In particular,
1.809 - * copying a signaling NaN to return it to the calling method may
1.810 - * perform this conversion. So {@code intBitsToFloat} may
1.811 - * not be able to return a {@code float} with a signaling NaN
1.812 - * bit pattern. Consequently, for some {@code int} values,
1.813 - * {@code floatToRawIntBits(intBitsToFloat(start))} may
1.814 - * <i>not</i> equal {@code start}. Moreover, which
1.815 - * particular bit patterns represent signaling NaNs is platform
1.816 - * dependent; although all NaN bit patterns, quiet or signaling,
1.817 - * must be in the NaN range identified above.
1.818 - *
1.819 - * @param bits an integer.
1.820 - * @return the {@code float} floating-point value with the same bit
1.821 - * pattern.
1.822 - */
1.823 - @JavaScriptBody(args = "bits",
1.824 - body =
1.825 - "var s = ((bits >> 31) == 0) ? 1 : -1;\n"
1.826 - + "var e = ((bits >> 23) & 0xff);\n"
1.827 - + "if (e === 0xff) {\n"
1.828 - + " if ((bits & 0x7fffff) === 0) {\n"
1.829 - + " return (s > 0) ? Number.POSITIVE_INFINITY"
1.830 - + " : Number.NEGATIVE_INFINITY;\n"
1.831 - + " }\n"
1.832 - + " return Number.NaN;\n"
1.833 - + "}\n"
1.834 - + "var m = (e == 0) ?\n"
1.835 - + " (bits & 0x7fffff) << 1 :\n"
1.836 - + " (bits & 0x7fffff) | 0x800000;\n"
1.837 - + "return s * m * Math.pow(2.0, e - 150);\n"
1.838 - )
1.839 - public static native float intBitsToFloat(int bits);
1.840 -
1.841 - /**
1.842 - * Compares two {@code Float} objects numerically. There are
1.843 - * two ways in which comparisons performed by this method differ
1.844 - * from those performed by the Java language numerical comparison
1.845 - * operators ({@code <, <=, ==, >=, >}) when
1.846 - * applied to primitive {@code float} values:
1.847 - *
1.848 - * <ul><li>
1.849 - * {@code Float.NaN} is considered by this method to
1.850 - * be equal to itself and greater than all other
1.851 - * {@code float} values
1.852 - * (including {@code Float.POSITIVE_INFINITY}).
1.853 - * <li>
1.854 - * {@code 0.0f} is considered by this method to be greater
1.855 - * than {@code -0.0f}.
1.856 - * </ul>
1.857 - *
1.858 - * This ensures that the <i>natural ordering</i> of {@code Float}
1.859 - * objects imposed by this method is <i>consistent with equals</i>.
1.860 - *
1.861 - * @param anotherFloat the {@code Float} to be compared.
1.862 - * @return the value {@code 0} if {@code anotherFloat} is
1.863 - * numerically equal to this {@code Float}; a value
1.864 - * less than {@code 0} if this {@code Float}
1.865 - * is numerically less than {@code anotherFloat};
1.866 - * and a value greater than {@code 0} if this
1.867 - * {@code Float} is numerically greater than
1.868 - * {@code anotherFloat}.
1.869 - *
1.870 - * @since 1.2
1.871 - * @see Comparable#compareTo(Object)
1.872 - */
1.873 - public int compareTo(Float anotherFloat) {
1.874 - return Float.compare(value, anotherFloat.value);
1.875 - }
1.876 -
1.877 - /**
1.878 - * Compares the two specified {@code float} values. The sign
1.879 - * of the integer value returned is the same as that of the
1.880 - * integer that would be returned by the call:
1.881 - * <pre>
1.882 - * new Float(f1).compareTo(new Float(f2))
1.883 - * </pre>
1.884 - *
1.885 - * @param f1 the first {@code float} to compare.
1.886 - * @param f2 the second {@code float} to compare.
1.887 - * @return the value {@code 0} if {@code f1} is
1.888 - * numerically equal to {@code f2}; a value less than
1.889 - * {@code 0} if {@code f1} is numerically less than
1.890 - * {@code f2}; and a value greater than {@code 0}
1.891 - * if {@code f1} is numerically greater than
1.892 - * {@code f2}.
1.893 - * @since 1.4
1.894 - */
1.895 - public static int compare(float f1, float f2) {
1.896 - if (f1 < f2)
1.897 - return -1; // Neither val is NaN, thisVal is smaller
1.898 - if (f1 > f2)
1.899 - return 1; // Neither val is NaN, thisVal is larger
1.900 -
1.901 - // Cannot use floatToRawIntBits because of possibility of NaNs.
1.902 - int thisBits = Float.floatToIntBits(f1);
1.903 - int anotherBits = Float.floatToIntBits(f2);
1.904 -
1.905 - return (thisBits == anotherBits ? 0 : // Values are equal
1.906 - (thisBits < anotherBits ? -1 : // (-0.0, 0.0) or (!NaN, NaN)
1.907 - 1)); // (0.0, -0.0) or (NaN, !NaN)
1.908 - }
1.909 -
1.910 - /** use serialVersionUID from JDK 1.0.2 for interoperability */
1.911 - private static final long serialVersionUID = -2671257302660747028L;
1.912 -}