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

Constructor Summary

Constructors

Constructor and Description
NumberUtils()

Method Summary

Methods

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

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)