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NumberUtils (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.util
Class NumberUtils

java.lang.Object
  org.springframework.util.NumberUtils

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public abstract class NumberUtils
extends Object

Miscellaneous utility methods for number conversion and parsing. Mainly for internal use within the framework; consider Jakarta's Commons Lang for a more comprehensive suite of string utilities.

Since:

1.1.2

Author:

Juergen Hoeller, Rob Harrop

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Constructor Summary
NumberUtils()

 

Method Summary
static Number	convertNumberToTargetClass(Number number, Class targetClass)           Convert the given number into an instance of the given target class.
static Number	parseNumber(String text, Class targetClass)           Parse the given text into a number instance of the given target class, using the corresponding default decode methods.
static Number	parseNumber(String text, Class targetClass, NumberFormat numberFormat)           Parse the given text into a number instance of the given target class, using the given NumberFormat.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

NumberUtils

public NumberUtils()

Method Detail

convertNumberToTargetClass

public static Number convertNumberToTargetClass(Number number,
                                                Class targetClass)
                                         throws IllegalArgumentException

Convert the given number into an instance of the given target class.

Parameters:

number - the number to convert

targetClass - the target class to convert to

Returns:

the converted number

Throws:

IllegalArgumentException - if the target class is not supported (i.e. not a standard Number subclass as included in the JDK)

See Also:

Byte, Short, Integer, Long, BigInteger, Float, Double, BigDecimal

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parseNumber

public static Number parseNumber(String text,
                                 Class targetClass)

Parse the given text into a number instance of the given target class, using the corresponding default decode methods. Trims the input String before attempting to parse the number. Supports numbers in hex format (with leading 0x) and in octal format (with leading 0).

Parameters:

text - the text to convert

targetClass - the target class to parse into

Returns:

the parsed number

Throws:

IllegalArgumentException - if the target class is not supported (i.e. not a standard Number subclass as included in the JDK)

See Also:

Byte.decode(java.lang.String), Short.decode(java.lang.String), Integer.decode(java.lang.String), Long.decode(java.lang.String), decodeBigInteger(String), Float.valueOf(java.lang.String), Double.valueOf(java.lang.String), BigDecimal.BigDecimal(String)

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parseNumber

public static Number parseNumber(String text,
                                 Class targetClass,
                                 NumberFormat numberFormat)

Parse the given text into a number instance of the given target class, using the given NumberFormat. Trims the input String before attempting to parse the number.

Parameters:

text - the text to convert

targetClass - the target class to parse into

numberFormat - the NumberFormat to use for parsing (if null, this method falls back to parseNumber(String, Class))

Returns:

the parsed number

Throws:

IllegalArgumentException - if the target class is not supported (i.e. not a standard Number subclass as included in the JDK)

See Also:

NumberFormat.parse(java.lang.String, java.text.ParsePosition), convertNumberToTargetClass(java.lang.Number, java.lang.Class), parseNumber(String, Class)

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