/* * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.misc; /** * This class contains additional constants documenting limits of the * <code>double</code> type. * * @author Joseph D. Darcy */ public class DoubleConsts {    /**     * Don't let anyone instantiate this class.     */    private DoubleConsts() {}     public static final double POSITIVE_INFINITY = java.lang.Double.POSITIVE_INFINITY;    public static final double NEGATIVE_INFINITY = java.lang.Double.NEGATIVE_INFINITY;    public static final double NaN = java.lang.Double.NaN;    public static final double MAX_VALUE = java.lang.Double.MAX_VALUE;    public static final double MIN_VALUE = java.lang.Double.MIN_VALUE;     /**     * A constant holding the smallest positive normal value of type     * <code>double</code>, 2<sup>-1022</sup>.  It is equal to the     * value returned by     * <code>Double.longBitsToDouble(0x0010000000000000L)</code>.     *     * @since 1.5     */    public static final double  MIN_NORMAL      = 2.2250738585072014E-308;      /**     * The number of logical bits in the significand of a     * <code>double</code> number, including the implicit bit.     */    public static final int SIGNIFICAND_WIDTH   = 53;     /**     * Maximum exponent a finite <code>double</code> number may have.     * It is equal to the value returned by     * <code>Math.ilogb(Double.MAX_VALUE)</code>.     */    public static final int     MAX_EXPONENT    = 1023;     /**     * Minimum exponent a normalized <code>double</code> number may     * have.  It is equal to the value returned by     * <code>Math.ilogb(Double.MIN_NORMAL)</code>.     */    public static final int     MIN_EXPONENT    = -1022;     /**     * The exponent the smallest positive <code>double</code>     * subnormal value would have if it could be normalized.  It is     * equal to the value returned by     * <code>FpUtils.ilogb(Double.MIN_VALUE)</code>.     */    public static final int     MIN_SUB_EXPONENT = MIN_EXPONENT -                                                   (SIGNIFICAND_WIDTH - 1);     /**     * Bias used in representing a <code>double</code> exponent.     */    public static final int     EXP_BIAS        = 1023;     /**     * Bit mask to isolate the sign bit of a <code>double</code>.     */    public static final long    SIGN_BIT_MASK   = 0x8000000000000000L;     /**     * Bit mask to isolate the exponent field of a     * <code>double</code>.     */    public static final long    EXP_BIT_MASK    = 0x7FF0000000000000L;     /**     * Bit mask to isolate the significand field of a     * <code>double</code>.     */    public static final long    SIGNIF_BIT_MASK = 0x000FFFFFFFFFFFFFL;     static {        // verify bit masks cover all bit positions and that the bit        // masks are non-overlapping        assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0L) &&               (((SIGN_BIT_MASK & EXP_BIT_MASK) == 0L) &&                ((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0L) &&                ((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0L)));    }}