org.springframework.util

类 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 Apache's Commons Lang for a more comprehensive suite of number utilities.

从以下版本开始:

1.1.2

作者:

Juergen Hoeller, Rob Harrop

字段概要

字段

限定符和类型	字段和说明
static Set<Class<?>>	STANDARD_NUMBER_TYPES Standard number types (all immutable): Byte, Short, Integer, Long, BigInteger, Float, Double, BigDecimal.

构造器概要

构造器

构造器和说明
NumberUtils()

方法概要

限定符和类型	方法和说明
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 method.
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 supplied NumberFormat.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

STANDARD_NUMBER_TYPES

public static final Set<Class<?>> STANDARD_NUMBER_TYPES

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

构造器详细资料

NumberUtils

public NumberUtils()

方法详细资料

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.

参数:

number - the number to convert

targetClass - the target class to convert to

返回:

the converted number

抛出:

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

另请参阅:

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 method.

Trims the input String before attempting to parse the number.

Supports numbers in hex format (with leading "0x", "0X", or "#") as well.

参数:

text - the text to convert

targetClass - the target class to parse into

返回:

the parsed number

抛出:

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

另请参阅:

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,
                                               @Nullable
                                               NumberFormat numberFormat)

Parse the given text into a Number instance of the given target class, using the supplied NumberFormat.

Trims the input String before attempting to parse the number.

参数:

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))

返回:

the parsed number

抛出:

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

另请参阅:

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