e0441a5bfb
libjava/ 2008-06-28 Matthias Klose <doko@ubuntu.com> Import GNU Classpath (classpath-0_97_2-release). * Regenerate class and header files. * Regenerate auto* files. * gcj/javaprims.h: Define jobjectRefType. * jni.cc (_Jv_JNI_GetObjectRefType): New (stub only). (_Jv_JNIFunctions): Initialize GetObjectRefType. * gnu/classpath/jdwp/VMVirtualMachine.java, java/security/VMSecureRandom.java: Merge from classpath. * HACKING: Fix typo. * ChangeLog-2007: New file. * configure.ac: Set JAVAC, pass --disable-regen-headers to classpath. libjava/classpath/ 2008-06-28 Matthias Klose <doko@ubuntu.com> * m4/ac_prog_javac.m4: Disable check for JAVAC, when not configured with --enable-java-maintainer-mode. * aclocal.m4, configure: Regenerate. * native/jni/gstreamer-peer/Makefile.am: Do not link with libclasspathnative. * native/jni/gstreamer-peer/Makefile.in: Regenerate. * tools/Makefile.am, lib/Makefile.am: Use JAVAC for setting JCOMPILER, drop flags not understood by gcj. From-SVN: r137223
622 lines
20 KiB
Java
622 lines
20 KiB
Java
/* Float.java -- object wrapper for float
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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/**
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* Instances of class <code>Float</code> represent primitive
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* <code>float</code> values.
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*
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* Additionally, this class provides various helper functions and variables
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* related to floats.
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*
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* @author Paul Fisher
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* @author Andrew Haley (aph@cygnus.com)
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* @author Eric Blake (ebb9@email.byu.edu)
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* @author Tom Tromey (tromey@redhat.com)
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.0
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* @status partly updated to 1.5
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*/
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public final class Float extends Number implements Comparable<Float>
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{
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/**
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* Compatible with JDK 1.0+.
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*/
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private static final long serialVersionUID = -2671257302660747028L;
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/**
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* The maximum positive value a <code>double</code> may represent
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* is 3.4028235e+38f.
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*/
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public static final float MAX_VALUE = 3.4028235e+38f;
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/**
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* The minimum positive value a <code>float</code> may represent
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* is 1.4e-45.
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*/
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public static final float MIN_VALUE = 1.4e-45f;
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/**
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* The value of a float representation -1.0/0.0, negative infinity.
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*/
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public static final float NEGATIVE_INFINITY = -1.0f / 0.0f;
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/**
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* The value of a float representation 1.0/0.0, positive infinity.
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*/
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public static final float POSITIVE_INFINITY = 1.0f / 0.0f;
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/**
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* All IEEE 754 values of NaN have the same value in Java.
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*/
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public static final float NaN = 0.0f / 0.0f;
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/**
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* The primitive type <code>float</code> is represented by this
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* <code>Class</code> object.
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* @since 1.1
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*/
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public static final Class<Float> TYPE = (Class<Float>) VMClassLoader.getPrimitiveClass('F');
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/**
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* The number of bits needed to represent a <code>float</code>.
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* @since 1.5
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*/
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public static final int SIZE = 32;
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/**
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* The immutable value of this Float.
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*
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* @serial the wrapped float
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*/
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private final float value;
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/**
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* Create a <code>Float</code> from the primitive <code>float</code>
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* specified.
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*
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* @param value the <code>float</code> argument
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*/
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public Float(float value)
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{
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this.value = value;
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}
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/**
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* Create a <code>Float</code> from the primitive <code>double</code>
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* specified.
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*
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* @param value the <code>double</code> argument
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*/
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public Float(double value)
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{
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this.value = (float) value;
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}
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/**
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* Create a <code>Float</code> from the specified <code>String</code>.
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* This method calls <code>Float.parseFloat()</code>.
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*
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* @param s the <code>String</code> to convert
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* @throws NumberFormatException if <code>s</code> cannot be parsed as a
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* <code>float</code>
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* @throws NullPointerException if <code>s</code> is null
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* @see #parseFloat(String)
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*/
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public Float(String s)
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{
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value = parseFloat(s);
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}
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/**
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* Convert the <code>float</code> to a <code>String</code>.
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* Floating-point string representation is fairly complex: here is a
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* rundown of the possible values. "<code>[-]</code>" indicates that a
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* negative sign will be printed if the value (or exponent) is negative.
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* "<code><number></code>" means a string of digits ('0' to '9').
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* "<code><digit></code>" means a single digit ('0' to '9').<br>
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*
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* <table border=1>
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* <tr><th>Value of Float</th><th>String Representation</th></tr>
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* <tr><td>[+-] 0</td> <td><code>[-]0.0</code></td></tr>
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* <tr><td>Between [+-] 10<sup>-3</sup> and 10<sup>7</sup>, exclusive</td>
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* <td><code>[-]number.number</code></td></tr>
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* <tr><td>Other numeric value</td>
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* <td><code>[-]<digit>.<number>
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* E[-]<number></code></td></tr>
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* <tr><td>[+-] infinity</td> <td><code>[-]Infinity</code></td></tr>
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* <tr><td>NaN</td> <td><code>NaN</code></td></tr>
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* </table>
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*
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* Yes, negative zero <em>is</em> a possible value. Note that there is
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* <em>always</em> a <code>.</code> and at least one digit printed after
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* it: even if the number is 3, it will be printed as <code>3.0</code>.
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* After the ".", all digits will be printed except trailing zeros. The
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* result is rounded to the shortest decimal number which will parse back
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* to the same float.
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*
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* <p>To create other output formats, use {@link java.text.NumberFormat}.
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*
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* @XXX specify where we are not in accord with the spec.
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*
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* @param f the <code>float</code> to convert
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* @return the <code>String</code> representing the <code>float</code>
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*/
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public static String toString(float f)
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{
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return VMFloat.toString(f);
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}
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/**
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* Convert a float value to a hexadecimal string. This converts as
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* follows:
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* <ul>
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* <li> A NaN value is converted to the string "NaN".
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* <li> Positive infinity is converted to the string "Infinity".
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* <li> Negative infinity is converted to the string "-Infinity".
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* <li> For all other values, the first character of the result is '-'
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* if the value is negative. This is followed by '0x1.' if the
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* value is normal, and '0x0.' if the value is denormal. This is
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* then followed by a (lower-case) hexadecimal representation of the
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* mantissa, with leading zeros as required for denormal values.
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* The next character is a 'p', and this is followed by a decimal
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* representation of the unbiased exponent.
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* </ul>
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* @param f the float value
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* @return the hexadecimal string representation
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* @since 1.5
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*/
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public static String toHexString(float f)
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{
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if (isNaN(f))
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return "NaN";
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if (isInfinite(f))
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return f < 0 ? "-Infinity" : "Infinity";
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int bits = floatToIntBits(f);
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StringBuilder result = new StringBuilder();
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if (bits < 0)
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result.append('-');
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result.append("0x");
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final int mantissaBits = 23;
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final int exponentBits = 8;
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int mantMask = (1 << mantissaBits) - 1;
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int mantissa = bits & mantMask;
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int expMask = (1 << exponentBits) - 1;
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int exponent = (bits >>> mantissaBits) & expMask;
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result.append(exponent == 0 ? '0' : '1');
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result.append('.');
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// For Float only, we have to adjust the mantissa.
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mantissa <<= 1;
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result.append(Integer.toHexString(mantissa));
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if (exponent == 0 && mantissa != 0)
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{
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// Treat denormal specially by inserting '0's to make
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// the length come out right. The constants here are
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// to account for things like the '0x'.
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int offset = 4 + ((bits < 0) ? 1 : 0);
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// The silly +3 is here to keep the code the same between
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// the Float and Double cases. In Float the value is
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// not a multiple of 4.
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int desiredLength = offset + (mantissaBits + 3) / 4;
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while (result.length() < desiredLength)
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result.insert(offset, '0');
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}
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result.append('p');
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if (exponent == 0 && mantissa == 0)
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{
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// Zero, so do nothing special.
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}
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else
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{
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// Apply bias.
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boolean denormal = exponent == 0;
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exponent -= (1 << (exponentBits - 1)) - 1;
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// Handle denormal.
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if (denormal)
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++exponent;
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}
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result.append(Integer.toString(exponent));
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return result.toString();
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}
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/**
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* Creates a new <code>Float</code> object using the <code>String</code>.
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*
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* @param s the <code>String</code> to convert
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* @return the new <code>Float</code>
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* @throws NumberFormatException if <code>s</code> cannot be parsed as a
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* <code>float</code>
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* @throws NullPointerException if <code>s</code> is null
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* @see #parseFloat(String)
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*/
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public static Float valueOf(String s)
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{
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return new Float(parseFloat(s));
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}
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/**
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* Returns a <code>Float</code> object wrapping the value.
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* In contrast to the <code>Float</code> constructor, this method
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* may cache some values. It is used by boxing conversion.
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*
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* @param val the value to wrap
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* @return the <code>Float</code>
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* @since 1.5
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*/
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public static Float valueOf(float val)
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{
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// We don't actually cache, but we could.
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return new Float(val);
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}
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/**
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* Parse the specified <code>String</code> as a <code>float</code>. The
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* extended BNF grammar is as follows:<br>
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* <pre>
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* <em>DecodableString</em>:
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* ( [ <code>-</code> | <code>+</code> ] <code>NaN</code> )
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* | ( [ <code>-</code> | <code>+</code> ] <code>Infinity</code> )
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* | ( [ <code>-</code> | <code>+</code> ] <em>FloatingPoint</em>
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* [ <code>f</code> | <code>F</code> | <code>d</code>
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* | <code>D</code>] )
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* <em>FloatingPoint</em>:
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* ( { <em>Digit</em> }+ [ <code>.</code> { <em>Digit</em> } ]
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* [ <em>Exponent</em> ] )
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* | ( <code>.</code> { <em>Digit</em> }+ [ <em>Exponent</em> ] )
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* <em>Exponent</em>:
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* ( ( <code>e</code> | <code>E</code> )
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* [ <code>-</code> | <code>+</code> ] { <em>Digit</em> }+ )
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* <em>Digit</em>: <em><code>'0'</code> through <code>'9'</code></em>
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* </pre>
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*
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* <p>NaN and infinity are special cases, to allow parsing of the output
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* of toString. Otherwise, the result is determined by calculating
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* <em>n * 10<sup>exponent</sup></em> to infinite precision, then rounding
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* to the nearest float. Remember that many numbers cannot be precisely
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* represented in floating point. In case of overflow, infinity is used,
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* and in case of underflow, signed zero is used. Unlike Integer.parseInt,
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* this does not accept Unicode digits outside the ASCII range.
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*
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* <p>If an unexpected character is found in the <code>String</code>, a
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* <code>NumberFormatException</code> will be thrown. Leading and trailing
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* 'whitespace' is ignored via <code>String.trim()</code>, but spaces
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* internal to the actual number are not allowed.
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*
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* <p>To parse numbers according to another format, consider using
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* {@link java.text.NumberFormat}.
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*
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* @XXX specify where/how we are not in accord with the spec.
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*
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* @param str the <code>String</code> to convert
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* @return the <code>float</code> value of <code>s</code>
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* @throws NumberFormatException if <code>str</code> cannot be parsed as a
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* <code>float</code>
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* @throws NullPointerException if <code>str</code> is null
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* @see #MIN_VALUE
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* @see #MAX_VALUE
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* @see #POSITIVE_INFINITY
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* @see #NEGATIVE_INFINITY
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* @since 1.2
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*/
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public static float parseFloat(String str)
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{
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return VMFloat.parseFloat(str);
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}
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/**
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* Return <code>true</code> if the <code>float</code> has the same
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* value as <code>NaN</code>, otherwise return <code>false</code>.
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*
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* @param v the <code>float</code> to compare
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* @return whether the argument is <code>NaN</code>
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*/
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public static boolean isNaN(float v)
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{
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// This works since NaN != NaN is the only reflexive inequality
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// comparison which returns true.
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return v != v;
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}
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/**
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* Return <code>true</code> if the <code>float</code> has a value
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* equal to either <code>NEGATIVE_INFINITY</code> or
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* <code>POSITIVE_INFINITY</code>, otherwise return <code>false</code>.
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*
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* @param v the <code>float</code> to compare
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* @return whether the argument is (-/+) infinity
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*/
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public static boolean isInfinite(float v)
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{
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return v == POSITIVE_INFINITY || v == NEGATIVE_INFINITY;
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}
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/**
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* Return <code>true</code> if the value of this <code>Float</code>
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* is the same as <code>NaN</code>, otherwise return <code>false</code>.
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*
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* @return whether this <code>Float</code> is <code>NaN</code>
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*/
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public boolean isNaN()
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{
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return isNaN(value);
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}
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/**
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* Return <code>true</code> if the value of this <code>Float</code>
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* is the same as <code>NEGATIVE_INFINITY</code> or
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* <code>POSITIVE_INFINITY</code>, otherwise return <code>false</code>.
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*
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* @return whether this <code>Float</code> is (-/+) infinity
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*/
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public boolean isInfinite()
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{
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return isInfinite(value);
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}
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/**
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* Convert the <code>float</code> value of this <code>Float</code>
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* to a <code>String</code>. This method calls
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* <code>Float.toString(float)</code> to do its dirty work.
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*
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* @return the <code>String</code> representation
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* @see #toString(float)
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*/
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public String toString()
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{
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return toString(value);
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}
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/**
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* Return the value of this <code>Float</code> as a <code>byte</code>.
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*
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* @return the byte value
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* @since 1.1
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*/
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public byte byteValue()
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{
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return (byte) value;
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}
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/**
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* Return the value of this <code>Float</code> as a <code>short</code>.
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*
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* @return the short value
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* @since 1.1
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*/
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public short shortValue()
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{
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return (short) value;
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}
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/**
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* Return the value of this <code>Integer</code> as an <code>int</code>.
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*
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* @return the int value
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*/
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public int intValue()
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{
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return (int) value;
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}
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/**
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* Return the value of this <code>Integer</code> as a <code>long</code>.
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*
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* @return the long value
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*/
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public long longValue()
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{
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return (long) value;
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}
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/**
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* Return the value of this <code>Float</code>.
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*
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* @return the float value
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*/
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public float floatValue()
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{
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return value;
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}
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/**
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* Return the value of this <code>Float</code> as a <code>double</code>
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*
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* @return the double value
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*/
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public double doubleValue()
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{
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return value;
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}
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/**
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* Return a hashcode representing this Object. <code>Float</code>'s hash
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* code is calculated by calling <code>floatToIntBits(floatValue())</code>.
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*
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* @return this Object's hash code
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* @see #floatToIntBits(float)
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*/
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public int hashCode()
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{
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return floatToIntBits(value);
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}
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/**
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* Returns <code>true</code> if <code>obj</code> is an instance of
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* <code>Float</code> and represents the same float value. Unlike comparing
|
|
* two floats with <code>==</code>, this treats two instances of
|
|
* <code>Float.NaN</code> as equal, but treats <code>0.0</code> and
|
|
* <code>-0.0</code> as unequal.
|
|
*
|
|
* <p>Note that <code>f1.equals(f2)</code> is identical to
|
|
* <code>floatToIntBits(f1.floatValue()) ==
|
|
* floatToIntBits(f2.floatValue())</code>.
|
|
*
|
|
* @param obj the object to compare
|
|
* @return whether the objects are semantically equal
|
|
*/
|
|
public boolean equals(Object obj)
|
|
{
|
|
if (! (obj instanceof Float))
|
|
return false;
|
|
|
|
float f = ((Float) obj).value;
|
|
|
|
// Avoid call to native method. However, some implementations, like gcj,
|
|
// are better off using floatToIntBits(value) == floatToIntBits(f).
|
|
// Check common case first, then check NaN and 0.
|
|
if (value == f)
|
|
return (value != 0) || (1 / value == 1 / f);
|
|
return isNaN(value) && isNaN(f);
|
|
}
|
|
|
|
/**
|
|
* Convert the float to the IEEE 754 floating-point "single format" bit
|
|
* layout. Bit 31 (the most significant) is the sign bit, bits 30-23
|
|
* (masked by 0x7f800000) represent the exponent, and bits 22-0
|
|
* (masked by 0x007fffff) are the mantissa. This function collapses all
|
|
* versions of NaN to 0x7fc00000. The result of this function can be used
|
|
* as the argument to <code>Float.intBitsToFloat(int)</code> to obtain the
|
|
* original <code>float</code> value.
|
|
*
|
|
* @param value the <code>float</code> to convert
|
|
* @return the bits of the <code>float</code>
|
|
* @see #intBitsToFloat(int)
|
|
*/
|
|
public static int floatToIntBits(float value)
|
|
{
|
|
if (isNaN(value))
|
|
return 0x7fc00000;
|
|
else
|
|
return VMFloat.floatToRawIntBits(value);
|
|
}
|
|
|
|
/**
|
|
* Convert the float to the IEEE 754 floating-point "single format" bit
|
|
* layout. Bit 31 (the most significant) is the sign bit, bits 30-23
|
|
* (masked by 0x7f800000) represent the exponent, and bits 22-0
|
|
* (masked by 0x007fffff) are the mantissa. This function leaves NaN alone,
|
|
* rather than collapsing to a canonical value. The result of this function
|
|
* can be used as the argument to <code>Float.intBitsToFloat(int)</code> to
|
|
* obtain the original <code>float</code> value.
|
|
*
|
|
* @param value the <code>float</code> to convert
|
|
* @return the bits of the <code>float</code>
|
|
* @see #intBitsToFloat(int)
|
|
*/
|
|
public static int floatToRawIntBits(float value)
|
|
{
|
|
return VMFloat.floatToRawIntBits(value);
|
|
}
|
|
|
|
/**
|
|
* Convert the argument in IEEE 754 floating-point "single format" bit
|
|
* layout to the corresponding float. Bit 31 (the most significant) is the
|
|
* sign bit, bits 30-23 (masked by 0x7f800000) represent the exponent, and
|
|
* bits 22-0 (masked by 0x007fffff) are the mantissa. This function leaves
|
|
* NaN alone, so that you can recover the bit pattern with
|
|
* <code>Float.floatToRawIntBits(float)</code>.
|
|
*
|
|
* @param bits the bits to convert
|
|
* @return the <code>float</code> represented by the bits
|
|
* @see #floatToIntBits(float)
|
|
* @see #floatToRawIntBits(float)
|
|
*/
|
|
public static float intBitsToFloat(int bits)
|
|
{
|
|
return VMFloat.intBitsToFloat(bits);
|
|
}
|
|
|
|
/**
|
|
* Compare two Floats numerically by comparing their <code>float</code>
|
|
* values. The result is positive if the first is greater, negative if the
|
|
* second is greater, and 0 if the two are equal. However, this special
|
|
* cases NaN and signed zero as follows: NaN is considered greater than
|
|
* all other floats, including <code>POSITIVE_INFINITY</code>, and positive
|
|
* zero is considered greater than negative zero.
|
|
*
|
|
* @param f the Float to compare
|
|
* @return the comparison
|
|
* @since 1.2
|
|
*/
|
|
public int compareTo(Float f)
|
|
{
|
|
return compare(value, f.value);
|
|
}
|
|
|
|
/**
|
|
* Behaves like <code>new Float(x).compareTo(new Float(y))</code>; in
|
|
* other words this compares two floats, special casing NaN and zero,
|
|
* without the overhead of objects.
|
|
*
|
|
* @param x the first float to compare
|
|
* @param y the second float to compare
|
|
* @return the comparison
|
|
* @since 1.4
|
|
*/
|
|
public static int compare(float x, float y)
|
|
{
|
|
// handle the easy cases:
|
|
if (x < y)
|
|
return -1;
|
|
if (x > y)
|
|
return 1;
|
|
|
|
// handle equality respecting that 0.0 != -0.0 (hence not using x == y):
|
|
int ix = floatToRawIntBits(x);
|
|
int iy = floatToRawIntBits(y);
|
|
if (ix == iy)
|
|
return 0;
|
|
|
|
// handle NaNs:
|
|
if (x != x)
|
|
return (y != y) ? 0 : 1;
|
|
else if (y != y)
|
|
return -1;
|
|
|
|
// handle +/- 0.0
|
|
return (ix < iy) ? -1 : 1;
|
|
}
|
|
}
|