org.springframework.util

Class NumberUtils

java.lang.Object

org.springframework.util.NumberUtils

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

Field Summary

Fields

Modifier and Type	Field and Description
static Set<Class<?>>	STANDARD_NUMBER_TYPES Standard number types (all immutable): Byte, Short, Integer, Long, BigInteger, Float, Double, BigDecimal.

Constructor Summary

Constructors

Constructor and Description
NumberUtils()

Method Summary

Modifier and Type	Method and Description
static <T extends Number> T	convertNumberToTargetClass(Number number, Class<T> targetClass) Convert the given number into an instance of the given target class.
static <T extends Number> T	parseNumber(String text, Class<T> targetClass) Parse the given text into a number instance of the given target class, using the corresponding decode / valueOf methods.
static <T extends Number> T	parseNumber(String text, Class<T> 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

Field Detail

STANDARD_NUMBER_TYPES

public static final Set<Class<?>> STANDARD_NUMBER_TYPES

Standard number types (all immutable): Byte, Short, Integer, Long, BigInteger, Float, Double, BigDecimal.

Constructor Detail

NumberUtils

public NumberUtils()

Method Detail

convertNumberToTargetClass

public static <T extends Number> T convertNumberToTargetClass(Number number,
                                                              Class<T> 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

parseNumber

public static <T extends Number> T parseNumber(String text,
                                               Class<T> targetClass)

Parse the given text into a number instance of the given target class, using the corresponding decode / valueOf methods.

Trims the input String before attempting to parse the number. Supports numbers in hex format (with leading "0x", "0X" or "#") as well.

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)

parseNumber

public static <T extends Number> T parseNumber(String text,
                                               Class<T> 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<T>), parseNumber(String, Class)