1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17
18package java.lang;
19
20
21/**
22 * The abstract superclass of the classes which represent numeric base types
23 * (that is {@link Byte}, {@link Short}, {@link Integer}, {@link Long},
24 * {@link Float}, and {@link Double}.
25 */
26public abstract class Number implements java.io.Serializable {
27
28    private static final long serialVersionUID = -8742448824652078965L;
29
30    /**
31     * Empty default constructor.
32     */
33    public Number() {
34    }
35
36    /**
37     * Returns this object's value as a byte. Might involve rounding and/or
38     * truncating the value, so it fits into a byte.
39     *
40     * @return the primitive byte value of this object.
41     */
42    public byte byteValue() {
43        return (byte) intValue();
44    }
45
46    /**
47     * Returns this object's value as a double. Might involve rounding.
48     *
49     * @return the primitive double value of this object.
50     */
51    public abstract double doubleValue();
52
53    /**
54     * Returns this object's value as a float. Might involve rounding.
55     *
56     * @return the primitive float value of this object.
57     */
58    public abstract float floatValue();
59
60    /**
61     * Returns this object's value as an int. Might involve rounding and/or
62     * truncating the value, so it fits into an int.
63     *
64     * @return the primitive int value of this object.
65     */
66    public abstract int intValue();
67
68    /**
69     * Returns this object's value as a long. Might involve rounding and/or
70     * truncating the value, so it fits into a long.
71     *
72     * @return the primitive long value of this object.
73     */
74    public abstract long longValue();
75
76    /**
77     * Returns this object's value as a short. Might involve rounding and/or
78     * truncating the value, so it fits into a short.
79     *
80     * @return the primitive short value of this object.
81     */
82    public short shortValue() {
83        return (short) intValue();
84    }
85}
86