java.lang.Number Maven / Gradle / Ivy
/*
This is not an official specification document, and usage is restricted.
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(c) 2005-2007 Sun Microsystems, Inc. All Rights Reserved.
Neither this file nor any files generated from it describe a complete
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whole or in part, in an implementation of a Java specification.
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documentation, such as a unified set of documents of API signatures for
a platform that includes technologies expressed as Java APIs. The file
may also be used to produce "compilation stubs," which allow
applications to be compiled and validated for such platforms.
Any work generated from this file, such as unified javadocs or compiled
stub files, must be accompanied by this notice in its entirety.
This work corresponds to the API signatures of JSR 219: Foundation
Profile 1.1. In the event of a discrepency between this work and the
JSR 219 specification, which is available at
http://www.jcp.org/en/jsr/detail?id=219, the latter takes precedence.
*/
package java.lang;
/**
* The abstract class Number is the superclass of classes
* BigDecimal, BigInteger,
* Byte, Double, Float,
* Integer, Long, and Short.
* NOTE: java.math.BigDecimal is found in J2ME CDC profiles such as
* J2ME Foundation Profile.
*
* Subclasses of Number must provide methods to convert
* the represented numeric value to byte, double,
* float, int, long, and
* short.
*
* @author Lee Boynton
* @author Arthur van Hoff
* @version 1.25, 02/02/00
* @see java.lang.Byte
* @see java.lang.Double
* @see java.lang.Float
* @see java.lang.Integer
* @see java.lang.Long
* @see java.lang.Short
* @since JDK1.0
*/
public abstract class Number implements java.io.Serializable
{
public Number() { }
/**
* Returns the value of the specified number as an int.
* This may involve rounding or truncation.
*
* @return the numeric value represented by this object after conversion
* to type int.
*/
public abstract int intValue();
/**
* Returns the value of the specified number as a long.
* This may involve rounding or truncation.
*
* @return the numeric value represented by this object after conversion
* to type long.
*/
public abstract long longValue();
/**
* Returns the value of the specified number as a float.
* This may involve rounding.
*
* @return the numeric value represented by this object after conversion
* to type float.
*/
public abstract float floatValue();
/**
* Returns the value of the specified number as a double.
* This may involve rounding.
*
* @return the numeric value represented by this object after conversion
* to type double.
*/
public abstract double doubleValue();
/**
* Returns the value of the specified number as a byte.
* This may involve rounding or truncation.
*
* @return the numeric value represented by this object after conversion
* to type byte.
* @since JDK1.1
*/
public byte byteValue() {
return ' ';
}
/**
* Returns the value of the specified number as a short.
* This may involve rounding or truncation.
*
* @return the numeric value represented by this object after conversion
* to type short.
* @since JDK1.1
*/
public short shortValue() {
return -1;
}
/** use serialVersionUID from JDK 1.0.2 for interoperability */
private static final long serialVersionUID = -8742448824652078965L;
}