程序包 cn.taketoday.util

类 NumberUtils

java.lang.Object

cn.taketoday.util.NumberUtils

public abstract class NumberUtils
extends Object

作者:

TODAY
2018-07-06 13:36:29

字段概要

字段

修饰符和类型	字段	说明
static final 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	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 boolean	isNumber(Class<?> targetClass)	Is a number?
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

isNumber

public static boolean isNumber(Class<?> targetClass)

Is a number?

参数:

targetClass - the target class

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 all whitespace (leading, trailing, and in between characters) from 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,
 @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)