natString.cc (init): Handle case where DONT_COPY is true and OFFSET!=0.
* java/lang/natString.cc (init): Handle case where DONT_COPY is true and OFFSET!=0. * java/lang/String.java (String(char[],int,int,boolean): New constructor. * java/lang/Long.java: Imported new version from Classpath. * java/lang/Number.java: Likewise. * java/lang/Integer.java: Likewise. * java/lang/Long.java: Likewise. * java/lang/Float.java: Likewise. * java/lang/Boolean.java: Likewise. * java/lang/Double.java: Likewise. * java/lang/Void.java: Likewise. From-SVN: r54595
This commit is contained in:
Tom Tromey
Tom Tromey
parent
a8fa30f301
commit
93f7aeea7a
10 changed files with 1874 additions and 1723 deletions
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@ -1,4 +1,4 @@
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/* Double.java -- object wrapper for double primitive
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/* Double.java -- object wrapper for double
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Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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@ -7,7 +7,7 @@ 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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@ -40,12 +40,6 @@ package java.lang;
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import gnu.classpath.Configuration;
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Believed complete and correct.
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*/
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/**
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* Instances of class <code>Double</code> represent primitive
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* <code>double</code> values.
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@ -55,15 +49,16 @@ import gnu.classpath.Configuration;
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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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* @since JDK 1.0
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* @author Eric Blake <ebb9@email.byu.edu>
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* @since 1.0
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* @status updated to 1.4
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*/
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public final class Double extends Number implements Comparable
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{
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/**
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* The minimum positive value a <code>double</code> may represent
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* is 5e-324.
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* Compatible with JDK 1.0+.
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*/
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public static final double MIN_VALUE = 5e-324;
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private static final long serialVersionUID = -9172774392245257468L;
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/**
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* The maximum positive value a <code>double</code> may represent
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@ -72,43 +67,50 @@ public final class Double extends Number implements Comparable
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public static final double MAX_VALUE = 1.7976931348623157e+308;
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/**
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* The value of a double representation -1.0/0.0, negative
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* infinity.
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* The minimum positive value a <code>double</code> may represent
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* is 5e-324.
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*/
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public static final double NEGATIVE_INFINITY = -1.0d/0.0d;
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public static final double MIN_VALUE = 5e-324;
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/**
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* The value of a double representation -1.0/0.0, negative
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* infinity.
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*/
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public static final double NEGATIVE_INFINITY = -1.0 / 0.0;
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/**
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* The value of a double representing 1.0/0.0, positive infinity.
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*/
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public static final double POSITIVE_INFINITY = 1.0d/0.0d;
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public static final double POSITIVE_INFINITY = 1.0 / 0.0;
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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 double NaN = 0.0d/0.0d;
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public static final double NaN = 0.0 / 0.0;
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/**
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* The primitive type <code>double</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 TYPE = VMClassLoader.getPrimitiveClass('D');
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/**
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* The immutable value of this Double.
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*
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* @serial the wrapped double
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*/
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private final double value;
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private static final long serialVersionUID = -9172774392245257468L;
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/**
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* Load native routines necessary for this class.
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* Load native routines necessary for this class.
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*/
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static
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{
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if (Configuration.INIT_LOAD_LIBRARY)
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{
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System.loadLibrary ("javalang");
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initIDs ();
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System.loadLibrary("javalang");
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initIDs();
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}
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}
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@ -118,149 +120,134 @@ public final class Double extends Number implements Comparable
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*
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* @param value the <code>double</code> argument
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*/
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public Double (double value)
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public Double(double 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>Double</code> from the specified
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* <code>String</code>.
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*
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* Create a <code>Double</code> from the specified <code>String</code>.
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* This method calls <code>Double.parseDouble()</code>.
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*
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* @exception NumberFormatException when the <code>String</code> cannot
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* be parsed into a <code>Float</code>.
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* @param s the <code>String</code> to convert
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* @see #parseDouble(java.lang.String)
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* @throws NumberFormatException if <code>s</code> cannot be parsed as a
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* <code>double</code>
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* @throws NullPointerException if <code>s</code> is null
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* @see #parseDouble(String)
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*/
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public Double (String s) throws NumberFormatException
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public Double(String s)
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{
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value = parseDouble (s);
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value = parseDouble(s);
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}
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/**
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* Convert the <code>double</code> value of this <code>Double</code>
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* to a <code>String</code>. This method calls
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* <code>Double.toString(double)</code> to do its dirty work.
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* Convert the <code>double</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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* @return the <code>String</code> representation of this <code>Double</code>.
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* @see #toString(double)
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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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* If the <code>Object</code> is not <code>null</code>, is an
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* <code>instanceof</code> <code>Double</code>, and represents
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* the same primitive <code>double</code> value return
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* <code>true</code>. Otherwise <code>false</code> is returned.
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* <p>
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* Note that there are two differences between <code>==</code> and
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* <code>equals()</code>. <code>0.0d == -0.0d</code> returns <code>true</code>
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* but <code>new Double(0.0d).equals(new Double(-0.0d))</code> returns
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* <code>false</code>. And <code>Double.NaN == Double.NaN</code> returns
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* <code>false</code>, but
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* <code>new Double(Double.NaN).equals(new Double(Double.NaN))</code> returns
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* <code>true</code>.
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* <table border=1>
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* <tr><th>Value of Double</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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* @param obj the object to compare to
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* @return whether the objects are semantically equal.
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*/
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public boolean equals (Object obj)
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{
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if (!(obj instanceof Double))
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return false;
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double d = ((Double) obj).value;
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// GCJ LOCAL: this implementation is probably faster than
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// Classpath's, especially once we inline doubleToLongBits.
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return doubleToLongBits (value) == doubleToLongBits (d);
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// END GCJ LOCAL
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}
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/**
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* The hashcode is the value of the expression: <br>
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* <br>
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* <code>(int)(v^(v>>>32))</code><br>
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* <br>
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* where v is defined by: <br>
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* <code>long v = Double.doubleToLongBits(this.longValue());</code><br>
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*/
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public int hashCode ()
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{
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long v = doubleToLongBits (value);
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return (int) (v ^ (v >>> 32));
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}
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/**
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* Return the value of this <code>Double</code> when cast to an
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* <code>int</code>.
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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>Double</code> when cast to a
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* <code>long</code>.
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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>Double</code> when cast to a
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* <code>float</code>.
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*/
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public float floatValue ()
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{
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return (float) value;
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}
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/**
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* Return the primitive <code>double</code> value represented by this
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* <code>Double</code>.
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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 the result of calling <code>new Double(java.lang.String)</code>.
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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 double.
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*
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* @param s the <code>String</code> to convert to a <code>Double</code>.
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* @return a new <code>Double</code> representing the <code>String</code>'s
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* numeric value.
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* <p>To create other output formats, use {@link java.text.NumberFormat}.
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*
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* @exception NullPointerException thrown if <code>String</code> is
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* <code>null</code>.
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* @exception NumberFormatException thrown if <code>String</code> cannot
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* be parsed as a <code>double</code>.
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* @see #Double(java.lang.String)
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* @see #parseDouble(java.lang.String)
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* @XXX specify where we are not in accord with the spec.
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*
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* @param d the <code>double</code> to convert
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* @return the <code>String</code> representing the <code>double</code>
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*/
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public static Double valueOf (String s) throws NumberFormatException
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public static String toString(double d)
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{
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return new Double (s);
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return toString(d, false);
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}
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/**
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* Return <code>true</code> if the value of this <code>Double</code>
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* is the same as <code>NaN</code>, otherwise return <code>false</code>.
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* @return whether this <code>Double</code> is <code>NaN</code>.
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* Create a new <code>Double</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>Double</code>
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* @throws NumberFormatException if <code>s</code> cannot be parsed as a
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* <code>double</code>
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* @throws NullPointerException if <code>s</code> is null.
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* @see #parseDouble(String)
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*/
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public boolean isNaN ()
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public static Double valueOf(String s)
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{
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return isNaN (value);
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// XXX just call new Double(parseDouble(s));
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if (s == null)
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throw new NullPointerException();
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return new Double(s);
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}
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/**
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* Parse the specified <code>String</code> as a <code>double</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 double. 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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||||
* <p>If an unexpected character is found in the <code>String</code>, a
|
||||
* <code>NumberFormatException</code> will be thrown. Leading and trailing
|
||||
* 'whitespace' is ignored via <code>String.trim()</code>, but spaces
|
||||
* internal to the actual number are not allowed.
|
||||
*
|
||||
* <p>To parse numbers according to another format, consider using
|
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* {@link java.text.NumberFormat}.
|
||||
*
|
||||
* @XXX specify where/how we are not in accord with the spec.
|
||||
*
|
||||
* @param str the <code>String</code> to convert
|
||||
* @return the <code>double</code> value of <code>s</code>
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* @throws NumberFormatException if <code>s</code> cannot be parsed as a
|
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* <code>double</code>
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||||
* @throws NullPointerException if <code>s</code> is null
|
||||
* @see #MIN_VALUE
|
||||
* @see #MAX_VALUE
|
||||
* @see #POSITIVE_INFINITY
|
||||
* @see #NEGATIVE_INFINITY
|
||||
* @since 1.2
|
||||
*/
|
||||
public static native double parseDouble(String s);
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||||
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||||
/**
|
||||
* Return <code>true</code> if the <code>double</code> has the same
|
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* value as <code>NaN</code>, otherwise return <code>false</code>.
|
||||
|
|
@ -268,7 +255,7 @@ public final class Double extends Number implements Comparable
|
|||
* @param v the <code>double</code> to compare
|
||||
* @return whether the argument is <code>NaN</code>.
|
||||
*/
|
||||
public static boolean isNaN (double v)
|
||||
public static boolean isNaN(double v)
|
||||
{
|
||||
// This works since NaN != NaN is the only reflexive inequality
|
||||
// comparison which returns true.
|
||||
|
|
@ -276,77 +263,255 @@ public final class Double extends Number implements Comparable
|
|||
}
|
||||
|
||||
/**
|
||||
* Return <code>true</code> if the value of this <code>Double</code>
|
||||
* is the same as <code>NEGATIVE_INFINITY</code> or
|
||||
* <code>POSITIVE_INFINITY</code>, otherwise return <code>false</code>.
|
||||
*
|
||||
* @return whether this <code>Double</code> is (-/+) infinity.
|
||||
*/
|
||||
public boolean isInfinite ()
|
||||
{
|
||||
return isInfinite (value);
|
||||
}
|
||||
|
||||
/**
|
||||
* Return <code>true</code> if the <code>double</code> has a value
|
||||
* equal to either <code>NEGATIVE_INFINITY</code> or
|
||||
* Return <code>true</code> if the <code>double</code> has a value
|
||||
* equal to either <code>NEGATIVE_INFINITY</code> or
|
||||
* <code>POSITIVE_INFINITY</code>, otherwise return <code>false</code>.
|
||||
*
|
||||
* @param v the <code>double</code> to compare
|
||||
* @return whether the argument is (-/+) infinity.
|
||||
*/
|
||||
public static boolean isInfinite (double v)
|
||||
public static boolean isInfinite(double v)
|
||||
{
|
||||
return (v == POSITIVE_INFINITY || v == NEGATIVE_INFINITY);
|
||||
return v == POSITIVE_INFINITY || v == NEGATIVE_INFINITY;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns 0 if the <code>double</code> value of the argument is
|
||||
* equal to the value of this <code>Double</code>. Returns a number
|
||||
* less than zero if the value of this <code>Double</code> is less
|
||||
* than the <code>double</code> value of the argument, and returns a
|
||||
* number greater than zero if the value of this <code>Double</code>
|
||||
* is greater than the <code>double</code> value of the argument.
|
||||
* <br>
|
||||
* <code>Double.NaN</code> is greater than any number other than itself,
|
||||
* even <code>Double.POSITIVE_INFINITY</code>.
|
||||
* <br>
|
||||
* <code>0.0d</code> is greater than <code>-0.0d</code>.
|
||||
* Return <code>true</code> if the value of this <code>Double</code>
|
||||
* is the same as <code>NaN</code>, otherwise return <code>false</code>.
|
||||
*
|
||||
* @param d the Double to compare to.
|
||||
* @return 0 if the <code>Double</code>s are the same, < 0 if this
|
||||
* <code>Double</code> is less than the <code>Double</code> in
|
||||
* in question, or > 0 if it is greater.
|
||||
* @return whether this <code>Double</code> is <code>NaN</code>
|
||||
*/
|
||||
public boolean isNaN()
|
||||
{
|
||||
return isNaN(value);
|
||||
}
|
||||
|
||||
/**
|
||||
* Return <code>true</code> if the value of this <code>Double</code>
|
||||
* is the same as <code>NEGATIVE_INFINITY</code> or
|
||||
* <code>POSITIVE_INFINITY</code>, otherwise return <code>false</code>.
|
||||
*
|
||||
* @return whether this <code>Double</code> is (-/+) infinity
|
||||
*/
|
||||
public boolean isInfinite()
|
||||
{
|
||||
return isInfinite(value);
|
||||
}
|
||||
|
||||
/**
|
||||
* Convert the <code>double</code> value of this <code>Double</code>
|
||||
* to a <code>String</code>. This method calls
|
||||
* <code>Double.toString(double)</code> to do its dirty work.
|
||||
*
|
||||
* @return the <code>String</code> representation
|
||||
* @see #toString(double)
|
||||
*/
|
||||
public String toString()
|
||||
{
|
||||
return toString(value);
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the value of this <code>Double</code> as a <code>byte</code>.
|
||||
*
|
||||
* @return the byte value
|
||||
* @since 1.1
|
||||
*/
|
||||
public byte byteValue()
|
||||
{
|
||||
return (byte) value;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the value of this <code>Double</code> as a <code>short</code>.
|
||||
*
|
||||
* @return the short value
|
||||
* @since 1.1
|
||||
*/
|
||||
public short shortValue()
|
||||
{
|
||||
return (short) value;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the value of this <code>Double</code> as an <code>int</code>.
|
||||
*
|
||||
* @return the int value
|
||||
*/
|
||||
public int intValue()
|
||||
{
|
||||
return (int) value;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the value of this <code>Double</code> as a <code>long</code>.
|
||||
*
|
||||
* @return the long value
|
||||
*/
|
||||
public long longValue()
|
||||
{
|
||||
return (long) value;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the value of this <code>Double</code> as a <code>float</code>.
|
||||
*
|
||||
* @return the float value
|
||||
*/
|
||||
public float floatValue()
|
||||
{
|
||||
return (float) value;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the value of this <code>Double</code>.
|
||||
*
|
||||
* @return the double value
|
||||
*/
|
||||
public double doubleValue()
|
||||
{
|
||||
return value;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return a hashcode representing this Object. <code>Double</code>'s hash
|
||||
* code is calculated by:<br>
|
||||
* <code>long v = Double.doubleToLongBits(doubleValue());<br>
|
||||
* int hash = (int)(v^(v>>32))</code>.
|
||||
*
|
||||
* @return this Object's hash code
|
||||
* @see #doubleToLongBits(double)
|
||||
*/
|
||||
public int hashCode()
|
||||
{
|
||||
long v = doubleToLongBits(value);
|
||||
return (int) (v ^ (v >>> 32));
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns <code>true</code> if <code>obj</code> is an instance of
|
||||
* <code>Double</code> and represents the same double value. Unlike comparing
|
||||
* two doubles with <code>==</code>, this treats two instances of
|
||||
* <code>Double.NaN</code> as equal, but treats <code>0.0</code> and
|
||||
* <code>-0.0</code> as unequal.
|
||||
*
|
||||
* <p>Note that <code>d1.equals(d2)<code> is identical to
|
||||
* <code>doubleToLongBits(d1.doubleValue()) ==
|
||||
* doubleToLongBits(d2.doubleValue())<code>.
|
||||
*
|
||||
* @param obj the object to compare
|
||||
* @return whether the objects are semantically equal
|
||||
*/
|
||||
public boolean equals(Object obj)
|
||||
{
|
||||
if (! (obj instanceof Double))
|
||||
return false;
|
||||
|
||||
double d = ((Double) 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 == d)
|
||||
return (value != 0) || (1 / value == 1 / d);
|
||||
return isNaN(value) && isNaN(d);
|
||||
}
|
||||
|
||||
/**
|
||||
* Convert the double to the IEEE 754 floating-point "double format" bit
|
||||
* layout. Bit 63 (the most significant) is the sign bit, bits 62-52
|
||||
* (masked by 0x7ff0000000000000L) represent the exponent, and bits 51-0
|
||||
* (masked by 0x000fffffffffffffL) are the mantissa. This function
|
||||
* collapses all versions of NaN to 0x7ff8000000000000L. The result of this
|
||||
* function can be used as the argument to
|
||||
* <code>Double.longBitsToDouble(long)</code> to obtain the original
|
||||
* <code>double</code> value.
|
||||
*
|
||||
* @param value the <code>double</code> to convert
|
||||
* @return the bits of the <code>double</code>
|
||||
* @see #longBitsToDouble(long)
|
||||
*/
|
||||
public static native long doubleToLongBits(double value);
|
||||
|
||||
/**
|
||||
* Convert the double to the IEEE 754 floating-point "double format" bit
|
||||
* layout. Bit 63 (the most significant) is the sign bit, bits 62-52
|
||||
* (masked by 0x7ff0000000000000L) represent the exponent, and bits 51-0
|
||||
* (masked by 0x000fffffffffffffL) 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>Double.longBitsToDouble(long)</code> to obtain the original
|
||||
* <code>double</code> value.
|
||||
*
|
||||
* @param value the <code>double</code> to convert
|
||||
* @return the bits of the <code>double</code>
|
||||
* @see #longBitsToDouble(long)
|
||||
*/
|
||||
public static native long doubleToRawLongBits(double value);
|
||||
|
||||
/**
|
||||
* Convert the argument in IEEE 754 floating-point "double format" bit
|
||||
* layout to the corresponding float. Bit 63 (the most significant) is the
|
||||
* sign bit, bits 62-52 (masked by 0x7ff0000000000000L) represent the
|
||||
* exponent, and bits 51-0 (masked by 0x000fffffffffffffL) are the mantissa.
|
||||
* This function leaves NaN alone, so that you can recover the bit pattern
|
||||
* with <code>Double.doubleToRawLongBits(double)</code>.
|
||||
*
|
||||
* @param bits the bits to convert
|
||||
* @return the <code>double</code> represented by the bits
|
||||
* @see #doubleToLongBits(double)
|
||||
* @see #doubleToRawLongBits(double)
|
||||
*/
|
||||
public static native double longBitsToDouble(long bits);
|
||||
|
||||
/**
|
||||
* Compare two Doubles numerically by comparing their <code>double</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 doubles, including <code>POSITIVE_INFINITY</code>, and positive
|
||||
* zero is considered greater than negative zero.
|
||||
*
|
||||
* @param d the Double to compare
|
||||
* @return the comparison
|
||||
* @since 1.2
|
||||
*/
|
||||
public int compareTo (Double d)
|
||||
public int compareTo(Double d)
|
||||
{
|
||||
return compare (value, d.value);
|
||||
return compare(value, d.value);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns 0 if the first argument is equal to the second argument.
|
||||
* Returns a number less than zero if the first argument is less than the
|
||||
* second argument, and returns a number greater than zero if the first
|
||||
* argument is greater than the second argument.
|
||||
* <br>
|
||||
* <code>Double.NaN</code> is greater than any number other than itself,
|
||||
* even <code>Double.POSITIVE_INFINITY</code>.
|
||||
* <br>
|
||||
* <code>0.0d</code> is greater than <code>-0.0d</code>.
|
||||
* Behaves like <code>compareTo(Double)</code> unless the Object
|
||||
* is not an <code>Double</code>.
|
||||
*
|
||||
* @param x the first double to compare.
|
||||
* @param y the second double to compare.
|
||||
* @return 0 if the arguments are the same, < 0 if the
|
||||
* first argument is less than the second argument in
|
||||
* in question, or > 0 if it is greater.
|
||||
* @param o the object to compare
|
||||
* @return the comparison
|
||||
* @throws ClassCastException if the argument is not a <code>Double</code>
|
||||
* @see #compareTo(Double)
|
||||
* @see Comparable
|
||||
* @since 1.2
|
||||
*/
|
||||
public int compareTo(Object o)
|
||||
{
|
||||
return compare(value, ((Double) o).value);
|
||||
}
|
||||
|
||||
/**
|
||||
* Behaves like <code>new Double(x).compareTo(new Double(y))</code>; in
|
||||
* other words this compares two doubles, special casing NaN and zero,
|
||||
* without the overhead of objects.
|
||||
*
|
||||
* @param x the first double to compare
|
||||
* @param y the second double to compare
|
||||
* @return the comparison
|
||||
* @since 1.4
|
||||
*/
|
||||
public static int compare (double x, double y)
|
||||
public static int compare(double x, double y)
|
||||
{
|
||||
if (isNaN (x))
|
||||
return isNaN (y) ? 0 : 1;
|
||||
if (isNaN (y))
|
||||
if (isNaN(x))
|
||||
return isNaN(y) ? 0 : 1;
|
||||
if (isNaN(y))
|
||||
return -1;
|
||||
// recall that 0.0 == -0.0, so we convert to infinites and try again
|
||||
if (x == 0 && y == 0)
|
||||
|
|
@ -358,171 +523,18 @@ public final class Double extends Number implements Comparable
|
|||
}
|
||||
|
||||
/**
|
||||
* Compares the specified <code>Object</code> to this <code>Double</code>
|
||||
* if and only if the <code>Object</code> is an instanceof
|
||||
* <code>Double</code>.
|
||||
* Helper method to convert to string.
|
||||
*
|
||||
* @param o the Object to compare to.
|
||||
* @return 0 if the <code>Double</code>s are the same, < 0 if this
|
||||
* <code>Double</code> is less than the <code>Double</code> in
|
||||
* in question, or > 0 if it is greater.
|
||||
* @throws ClassCastException if the argument is not a <code>Double</code>
|
||||
* @param d the double to convert
|
||||
* @param isFloat true if the conversion is requested by Float (results in
|
||||
* fewer digits)
|
||||
*/
|
||||
public int compareTo (Object o)
|
||||
{
|
||||
return compareTo ((Double) o);
|
||||
}
|
||||
// Package visible for use by Float.
|
||||
static native String toString(double d, boolean isFloat);
|
||||
|
||||
/**
|
||||
* Convert the <code>double</code> to a <code>String</code>.
|
||||
* <P>
|
||||
*
|
||||
* Floating-point string representation is fairly complex: here is a
|
||||
* rundown of the possible values. "<CODE>[-]</CODE>" indicates that a
|
||||
* negative sign will be printed if the value (or exponent) is negative.
|
||||
* "<CODE><number></CODE>" means a string of digits (0-9).
|
||||
* "<CODE><digit></CODE>" means a single digit (0-9).
|
||||
* <P>
|
||||
*
|
||||
* <TABLE BORDER=1>
|
||||
* <TR><TH>Value of Float</TH><TH>String Representation</TH></TR>
|
||||
* <TR>
|
||||
* <TD>[+-] 0</TD>
|
||||
* <TD>[<CODE>-</CODE>]<CODE>0.0</CODE></TD>
|
||||
* </TR>
|
||||
* <TR>
|
||||
* <TD>Between [+-] 10<SUP>-3</SUP> and 10<SUP>7</SUP></TD>
|
||||
* <TD><CODE>[-]number.number</CODE></TD>
|
||||
* </TR>
|
||||
* <TR>
|
||||
* <TD>Other numeric value</TD>
|
||||
* <TD><CODE>[-]<digit>.<number>E[-]<number></CODE></TD>
|
||||
* </TR>
|
||||
* <TR>
|
||||
* <TD>[+-] infinity</TD>
|
||||
* <TD><CODE>[-]Infinity</CODE></TD>
|
||||
* </TR>
|
||||
* <TR>
|
||||
* <TD>NaN</TD>
|
||||
* <TD><CODE>NaN</CODE></TD>
|
||||
* </TR>
|
||||
* </TABLE>
|
||||
*
|
||||
* Yes, negative zero <EM>is</EM> a possible value. Note that there is
|
||||
* <EM>always</EM> a <CODE>.</CODE> and at least one digit printed after
|
||||
* it: even if the number is 3, it will be printed as <CODE>3.0</CODE>.
|
||||
* After the ".", all digits will be printed except trailing zeros. No
|
||||
* truncation or rounding is done by this function.
|
||||
*
|
||||
*
|
||||
* @XXX specify where we are not in accord with the spec.
|
||||
*
|
||||
* @param d the <code>double</code> to convert
|
||||
* @return the <code>String</code> representing the <code>double</code>.
|
||||
*/
|
||||
public static String toString (double d)
|
||||
{
|
||||
return toString (d, false);
|
||||
}
|
||||
|
||||
static native String toString (double d, boolean isFloat);
|
||||
|
||||
/**
|
||||
* Return the long bits of the specified <code>double</code>.
|
||||
* The result of this function can be used as the argument to
|
||||
* <code>Double.longBitsToDouble(long)</code> to obtain the
|
||||
* original <code>double</code> value.
|
||||
*
|
||||
* @param value the <code>double</code> to convert
|
||||
* @return the bits of the <code>double</code>.
|
||||
*/
|
||||
public static native long doubleToLongBits (double value);
|
||||
|
||||
/**
|
||||
* Return the long bits of the specified <code>double</code>.
|
||||
* The result of this function can be used as the argument to
|
||||
* <code>Double.longBitsToDouble(long)</code> to obtain the
|
||||
* original <code>double</code> value. This method differs from
|
||||
* <code>doubleToLongBits</code> in that it does not collapse
|
||||
* NaN values.
|
||||
*
|
||||
* @param value the <code>double</code> to convert
|
||||
* @return the bits of the <code>double</code>.
|
||||
*/
|
||||
public static native long doubleToRawLongBits (double value);
|
||||
|
||||
/**
|
||||
* Return the <code>double</code> represented by the long
|
||||
* bits specified.
|
||||
*
|
||||
* @param bits the long bits representing a <code>double</code>
|
||||
* @return the <code>double</code> represented by the bits.
|
||||
*/
|
||||
public static native double longBitsToDouble (long bits);
|
||||
|
||||
/**
|
||||
* Parse the specified <code>String</code> as a <code>double</code>.
|
||||
*
|
||||
* The number is really read as <em>n * 10<sup>exponent</sup></em>. The
|
||||
* first number is <em>n</em>, and if there is an "<code>E</code>"
|
||||
* ("<code>e</code>" is also acceptable), then the integer after that is
|
||||
* the exponent.
|
||||
* <P>
|
||||
* Here are the possible forms the number can take:
|
||||
* <BR>
|
||||
* <TABLE BORDER=1>
|
||||
* <TR><TH>Form</TH><TH>Examples</TH></TR>
|
||||
* <TR><TD><CODE>[+-]<number>[.]</CODE></TD><TD>345., -10, 12</TD></TR>
|
||||
* <TR><TD><CODE>[+-]<number>.<number></CODE></TD><TD>40.2, 80.00, -12.30</TD></TR>
|
||||
* <TR><TD><CODE>[+-]<number>[.]E[+-]<number></CODE></TD><TD>80E12, -12e+7, 4.E-123</TD></TR>
|
||||
* <TR><TD><CODE>[+-]<number>.<number>E[+-]<number></CODE></TD><TD>6.02e-22, -40.2E+6, 12.3e9</TD></TR>
|
||||
* </TABLE>
|
||||
*
|
||||
* "<code>[+-]</code>" means either a plus or minus sign may go there, or
|
||||
* neither, in which case + is assumed.
|
||||
* <BR>
|
||||
* "<code>[.]</code>" means a dot may be placed here, but is optional.
|
||||
* <BR>
|
||||
* "<code><number></code>" means a string of digits (0-9), basically
|
||||
* an integer. "<code><number>.<number></code>" is basically
|
||||
* a real number, a floating-point value.
|
||||
* <P>
|
||||
*
|
||||
* Remember that a <code>double</code> has a limited range. If the
|
||||
* number you specify is greater than <code>Double.MAX_VALUE</code> or less
|
||||
* than <code>-Double.MAX_VALUE</code>, it will be set at
|
||||
* <code>Double.POSITIVE_INFINITY</code> or
|
||||
* <code>Double.NEGATIVE_INFINITY</code>, respectively.
|
||||
* <P>
|
||||
* Note also that <code>double</code> does not have perfect precision. Many
|
||||
* numbers cannot be precisely represented. The number you specify
|
||||
* will be rounded to the nearest representable value.
|
||||
* <code>Double.MIN_VALUE</code> is the margin of error for
|
||||
* <code>double</code> values.
|
||||
* <P>
|
||||
* If an unexpected character is found in the <code>String</code>, a
|
||||
* <code>NumberFormatException</code> will be thrown. Spaces are not
|
||||
* allowed, and will cause the same exception.
|
||||
*
|
||||
* @XXX specify where/how we are not in accord with the spec.
|
||||
*
|
||||
* @param str the <code>String</code> to convert
|
||||
* @return the value of the <code>String</code> as a <code>double</code>.
|
||||
* @exception NumberFormatException when the string cannot be parsed to a
|
||||
* <code>double</code>.
|
||||
* @exception NullPointerException when the string is null.
|
||||
* @see #MIN_VALUE
|
||||
* @see #MAX_VALUE
|
||||
* @see #POSITIVE_INFINITY
|
||||
* @see #NEGATIVE_INFINITY
|
||||
* @since 1.2
|
||||
*/
|
||||
public static native double parseDouble (String s)
|
||||
throws NumberFormatException;
|
||||
|
||||
/**
|
||||
* Initialize JNI cache. This method is called only by the
|
||||
* Initialize JNI cache. This method is called only by the
|
||||
* static initializer when using JNI.
|
||||
*/
|
||||
private static native void initIDs ();
|
||||
private static native void initIDs();
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue