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125 lines
3.6 KiB
125 lines
3.6 KiB
/*
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* Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.lang;
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/**
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* The abstract class {@code Number} is the superclass of platform
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* classes representing numeric values that are convertible to the
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* primitive types {@code byte}, {@code double}, {@code float}, {@code
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* int}, {@code long}, and {@code short}.
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*
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* The specific semantics of the conversion from the numeric value of
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* a particular {@code Number} implementation to a given primitive
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* type is defined by the {@code Number} implementation in question.
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*
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* For platform classes, the conversion is often analogous to a
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* narrowing primitive conversion or a widening primitive conversion
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* as defining in <cite>The Java™ Language Specification</cite>
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* for converting between primitive types. Therefore, conversions may
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* lose information about the overall magnitude of a numeric value, may
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* lose precision, and may even return a result of a different sign
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* than the input.
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*
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* See the documentation of a given {@code Number} implementation for
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* conversion details.
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*
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* @author Lee Boynton
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* @author Arthur van Hoff
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* @jls 5.1.2 Widening Primitive Conversions
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* @jls 5.1.3 Narrowing Primitive Conversions
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* @since JDK1.0
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*/
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public abstract class Number implements java.io.Serializable {
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/**
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* Returns the value of the specified number as an {@code int},
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* which may involve rounding or truncation.
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*
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* @return the numeric value represented by this object after conversion
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* to type {@code int}.
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*/
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public abstract int intValue();
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/**
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* Returns the value of the specified number as a {@code long},
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* which may involve rounding or truncation.
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*
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* @return the numeric value represented by this object after conversion
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* to type {@code long}.
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*/
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public abstract long longValue();
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/**
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* Returns the value of the specified number as a {@code float},
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* which may involve rounding.
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*
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* @return the numeric value represented by this object after conversion
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* to type {@code float}.
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*/
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public abstract float floatValue();
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/**
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* Returns the value of the specified number as a {@code double},
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* which may involve rounding.
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*
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* @return the numeric value represented by this object after conversion
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* to type {@code double}.
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*/
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public abstract double doubleValue();
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/**
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* Returns the value of the specified number as a {@code byte},
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* which may involve rounding or truncation.
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*
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* <p>This implementation returns the result of {@link #intValue} cast
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* to a {@code byte}.
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*
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* @return the numeric value represented by this object after conversion
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* to type {@code byte}.
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* @since JDK1.1
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*/
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public byte byteValue() {
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return (byte)intValue();
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}
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/**
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* Returns the value of the specified number as a {@code short},
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* which may involve rounding or truncation.
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*
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* <p>This implementation returns the result of {@link #intValue} cast
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* to a {@code short}.
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*
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* @return the numeric value represented by this object after conversion
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* to type {@code short}.
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* @since JDK1.1
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*/
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public short shortValue() {
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return (short)intValue();
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}
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/** use serialVersionUID from JDK 1.0.2 for interoperability */
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private static final long serialVersionUID = -8742448824652078965L;
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}
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