程序包 com.walker.infrastructure.utils

类 NumberUtils

java.lang.Object

com.walker.infrastructure.utils.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.

从以下版本开始:

1.1.2

作者:

Juergen Hoeller, Rob Harrop

构造器概要

构造器

构造器	说明
NumberUtils()

方法概要

修饰符和类型	方法	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 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.

从类继承的方法 java.lang.Object

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

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 methods.

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(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.

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)