001: /*
002: * Copyright 1994-2001 Sun Microsystems, Inc. All Rights Reserved.
003: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004: *
005: * This code is free software; you can redistribute it and/or modify it
006: * under the terms of the GNU General Public License version 2 only, as
007: * published by the Free Software Foundation. Sun designates this
008: * particular file as subject to the "Classpath" exception as provided
009: * by Sun in the LICENSE file that accompanied this code.
010: *
011: * This code is distributed in the hope that it will be useful, but WITHOUT
012: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014: * version 2 for more details (a copy is included in the LICENSE file that
015: * accompanied this code).
016: *
017: * You should have received a copy of the GNU General Public License version
018: * 2 along with this work; if not, write to the Free Software Foundation,
019: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020: *
021: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022: * CA 95054 USA or visit www.sun.com if you need additional information or
023: * have any questions.
024: */
025:
026: package java.lang;
027:
028: /**
029: * The abstract class <code>Number</code> is the superclass of classes
030: * <code>BigDecimal</code>, <code>BigInteger</code>,
031: * <code>Byte</code>, <code>Double</code>, <code>Float</code>,
032: * <code>Integer</code>, <code>Long</code>, and <code>Short</code>.
033: * <p>
034: * Subclasses of <code>Number</code> must provide methods to convert
035: * the represented numeric value to <code>byte</code>, <code>double</code>,
036: * <code>float</code>, <code>int</code>, <code>long</code>, and
037: * <code>short</code>.
038: *
039: * @author Lee Boynton
040: * @author Arthur van Hoff
041: * @version 1.36, 05/05/07
042: * @see java.lang.Byte
043: * @see java.lang.Double
044: * @see java.lang.Float
045: * @see java.lang.Integer
046: * @see java.lang.Long
047: * @see java.lang.Short
048: * @since JDK1.0
049: */
050: public abstract class Number implements java.io.Serializable {
051: /**
052: * Returns the value of the specified number as an <code>int</code>.
053: * This may involve rounding or truncation.
054: *
055: * @return the numeric value represented by this object after conversion
056: * to type <code>int</code>.
057: */
058: public abstract int intValue();
059:
060: /**
061: * Returns the value of the specified number as a <code>long</code>.
062: * This may involve rounding or truncation.
063: *
064: * @return the numeric value represented by this object after conversion
065: * to type <code>long</code>.
066: */
067: public abstract long longValue();
068:
069: /**
070: * Returns the value of the specified number as a <code>float</code>.
071: * This may involve rounding.
072: *
073: * @return the numeric value represented by this object after conversion
074: * to type <code>float</code>.
075: */
076: public abstract float floatValue();
077:
078: /**
079: * Returns the value of the specified number as a <code>double</code>.
080: * This may involve rounding.
081: *
082: * @return the numeric value represented by this object after conversion
083: * to type <code>double</code>.
084: */
085: public abstract double doubleValue();
086:
087: /**
088: * Returns the value of the specified number as a <code>byte</code>.
089: * This may involve rounding or truncation.
090: *
091: * @return the numeric value represented by this object after conversion
092: * to type <code>byte</code>.
093: * @since JDK1.1
094: */
095: public byte byteValue() {
096: return (byte) intValue();
097: }
098:
099: /**
100: * Returns the value of the specified number as a <code>short</code>.
101: * This may involve rounding or truncation.
102: *
103: * @return the numeric value represented by this object after conversion
104: * to type <code>short</code>.
105: * @since JDK1.1
106: */
107: public short shortValue() {
108: return (short) intValue();
109: }
110:
111: /** use serialVersionUID from JDK 1.0.2 for interoperability */
112: private static final long serialVersionUID = -8742448824652078965L;
113: }
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