cn.webfuse.core.kit.number

类 NumberKits

java.lang.Object

cn.webfuse.core.kit.number.NumberKits

public class NumberKits
extends Object

构造器概要

构造器

构造器和说明
NumberKits()

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) 将给定的数字转换为给定目标类的实例
static boolean	isHexNumber(String value) 判断字符串是否16进制
static boolean	isNumber(String str) 判断字符串是否合法数字
static <T extends Number> T	parseNumber(Object val, Class<T> targetClass) Parse the given val into a Number instance of the given target class, the default value is returned if an error occurs.
static <T extends Number> T	parseNumber(Object val, Class<T> targetClass, T defaultValue) Parse the given val into a Number instance of the given target class, the default value is returned if an error occurs.
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 BigDecimal	round(Number number, int scale, RoundingMode roundingMode) 保留固定位数小数 例如保留四位小数：123.456789 =》 123.4567
static BigDecimal	round(String number, int scale, RoundingMode roundingMode) 保留固定位数小数 例如保留四位小数：123.456789 =》 123.4567

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

NumberKits

public NumberKits()

方法详细资料

isNumber

public static boolean isNumber(String str)

判断字符串是否合法数字

isHexNumber

public static boolean isHexNumber(String value)

判断字符串是否16进制

round

public static BigDecimal round(Number number,
                               int scale,
                               RoundingMode roundingMode)

保留固定位数小数
例如保留四位小数：123.456789 =》 123.4567

参数:

number - 数字值

scale - 保留小数位数，如果传入小于0，则默认0

roundingMode - 保留小数的模式 RoundingMode，如果传入null则默认四舍五入

返回:

新值

round

public static BigDecimal round(String number,
                               int scale,
                               RoundingMode roundingMode)

保留固定位数小数
例如保留四位小数：123.456789 =》 123.4567

参数:

number - 数字值

scale - 保留小数位数，如果传入小于0，则默认0

roundingMode - 保留小数的模式 RoundingMode，如果传入null则默认四舍五入

返回:

新值

convertNumberToTargetClass

public static <T extends Number> T convertNumberToTargetClass(Number number,
                                                              Class<T> targetClass)
                                                       throws IllegalArgumentException

将给定的数字转换为给定目标类的实例

参数:

number - 将要转换的数字

targetClass - 目标类

返回:

转换后的数字

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(Object val,
                                               Class<T> targetClass,
                                               T defaultValue)

Parse the given val into a Number instance of the given target class, the default value is returned if an error occurs.

Trims the input Object before attempting to parse the number.

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

参数:

val - an object to convert

targetClass - the target class to parse into

defaultValue - an default value

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(Object val,
                                               Class<T> targetClass)

Parse the given val into a Number instance of the given target class, the default value is returned if an error occurs.

Trims the input Object before attempting to parse the number.

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

参数:

val - an object 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)