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 18 package 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 */ 26 public abstract class Number implements java.io.Serializable { 27 28 private static final long serialVersionUID = -8742448824652078965L; 29 30 /** 31 * Empty default constructor. 32 */ Number()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 */ byteValue()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 */ doubleValue()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 */ floatValue()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 */ intValue()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 */ longValue()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 */ shortValue()82 public short shortValue() { 83 return (short) intValue(); 84 } 85 } 86