150 lines
3.1 KiB
Java
150 lines
3.1 KiB
Java
/* Copyright (C) 1998, 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.lang;
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/**
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* @author Andrew Haley <aph@cygnus.com>
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* @date September 25, 1998.
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*/
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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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public final class Double extends Number
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{
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public static final double MIN_VALUE = 5e-324;
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public static final double MAX_VALUE = 1.7976931348623157e+308;
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public static final double NEGATIVE_INFINITY = -1.0d/0.0d;
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public static final double POSITIVE_INFINITY = 1.0d/0.0d;
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public static final double NaN = 0.0d/0.0d;
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// This initialization is seemingly circular, but it is accepted
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// by javac, and is handled specially by gcc.
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public static final Class TYPE = double.class;
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private double value;
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private native static double doubleValueOf (String s)
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throws NumberFormatException;
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public Double (double v)
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{
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value = v;
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}
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public Double (String s) throws NumberFormatException
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{
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value = valueOf (s).doubleValue ();
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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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public boolean equals (Object obj)
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{
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if (obj == null)
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return false;
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if (!(obj instanceof Double))
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return false;
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Double d = (Double) obj;
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return doubleToLongBits (value) == doubleToLongBits (d.doubleValue ());
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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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public int intValue ()
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{
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return (int) 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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public float floatValue ()
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{
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return (float) 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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public byte byteValue ()
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{
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return (byte) value;
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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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native static String toString (double v, boolean isFloat);
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public static String toString (double v)
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{
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return toString (v, false);
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}
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public static Double valueOf (String s) throws NullPointerException,
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NumberFormatException
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{
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if (s == null)
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throw new NullPointerException ();
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return new Double (doubleValueOf (s));
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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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public static boolean isNaN (double v)
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{
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long bits = doubleToLongBits (v);
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long e = bits & 0x7ff0000000000000L;
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long f = bits & 0x000fffffffffffffL;
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return e == 0x7ff0000000000000L && f != 0L;
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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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public static boolean isInfinite (double v)
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{
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long bits = doubleToLongBits (v);
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long f = bits & 0x7fffffffffffffffL;
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return f == 0x7ff0000000000000L;
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}
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public static native long doubleToLongBits (double value);
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public static native double longBitsToDouble (long bits);
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}
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