cn.ponfee.scheduler.common.util

类 Numbers

java.lang.Object

cn.ponfee.scheduler.common.util.Numbers

public final class Numbers
extends Object

 Number utility

 十进制：10
 二进制：0B10
 八进制：010
 十六进制：0X10
 小数点：1e-9
 

作者:

Ponfee

字段概要

字段

限定符和类型	字段和说明
static byte	ZERO_BYTE
static int	ZERO_INT
static Integer	ZERO_INTEGER

构造器概要

构造器

构造器和说明
Numbers()

方法概要

限定符和类型	方法和说明
static int	bound(Integer value, int min, int max) 区间取值
static boolean	equals(Long a, Integer b) Returns the Long object is equals the Integer object
static String	format(double d, int scale) Returns a string value of double
static String	format(Object obj) 数字格式化
static String	format(Object obj, String format) 数字格式化
static double	lower(double value, int pow) 向下转单位
static double	lower(double value, int pow, int scale)
static List<Tuple2<Integer,Integer>>	partition(int number, int size) Partition the number partition( 0, 2) -> [(0, 0)] partition( 2, 3) -> [(0, 0), (1, 1)] partition( 3, 1) -> [(0, 2)] partition( 9, 3) -> [(0, 2), (3, 5), (6, 8)] partition(10, 3) -> [(0, 3), (4, 6), (7, 9)] partition(11, 3) -> [(0, 3), (4, 7), (8, 10)] partition(12, 3) -> [(0, 3), (4, 7), (8, 11)]
static String	percent(double numerator, double denominator, int scale) 百分比
static String	percent(double value, int scale) 百分比
static double	scale(Object value, int scale) 数字精度化
static int[]	slice(int quantity, int segment) 分片 slice(0 , 2) -> [0, 0] slice(2 , 3) -> [1, 1, 0] slice(3 , 1) -> [3] slice(9 , 3) -> [3, 3, 3] slice(10, 3) -> [4, 3, 3] slice(11, 3) -> [4, 4, 3] slice(12, 3) -> [4, 4, 4]
static int[]	split(Long orderId, int[] bills, int value) Split the bill for coupon amount split(new int[]{249, 249, 249, 3}, 748) -> [249, 249, 248, 2]
static double	sum(Double a, Double b)
static int	sum(Integer a, Integer b)
static long	sum(Long a, Long b)
static boolean	toBoolean(Object obj)
static boolean	toBoolean(Object obj, boolean defaultVal)
static byte	toByte(Object obj)
static byte	toByte(Object obj, byte defaultVal)
static char	toChar(Object obj)
static char	toChar(Object obj, char defaultVal)
static double	toDouble(Object obj)
static double	toDouble(Object obj, double defaultVal)
static float	toFloat(Object obj)
static float	toFloat(Object obj, float defaultVal)
static String	toHex(BigInteger num) To upper hex string and remove prefix 0
static int	toInt(Object obj)
static int	toInt(Object obj, int defaultVal)
static long	toLong(Object obj)
static long	toLong(Object obj, long defaultVal)
static short	toShort(Object obj)
static short	toShort(Object obj, short defaultVal)
static Boolean	toWrapBoolean(Object obj)
static Byte	toWrapByte(Object obj)
static Character	toWrapChar(Object obj)
static Double	toWrapDouble(Object obj)
static Float	toWrapFloat(Object obj)
static Integer	toWrapInt(Object obj)
static Long	toWrapLong(Object obj)
static Short	toWrapShort(Object obj)
static double	upper(double value, int pow) 向上转单位
static double	upper(double value, int pow, int scale)

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

ZERO_INT

public static final int ZERO_INT

另请参阅:

常量字段值

ZERO_INTEGER

public static final Integer ZERO_INTEGER

ZERO_BYTE

public static final byte ZERO_BYTE

另请参阅:

常量字段值

构造器详细资料

Numbers

public Numbers()

方法详细资料

toChar

public static char toChar(Object obj)

toChar

public static char toChar(Object obj,
                          char defaultVal)

toWrapChar

public static Character toWrapChar(Object obj)

toBoolean

public static boolean toBoolean(Object obj)

toBoolean

public static boolean toBoolean(Object obj,
                                boolean defaultVal)

toWrapBoolean

public static Boolean toWrapBoolean(Object obj)

toByte

public static byte toByte(Object obj)

toByte

public static byte toByte(Object obj,
                          byte defaultVal)

toWrapByte

public static Byte toWrapByte(Object obj)

toShort

public static short toShort(Object obj)

toShort

public static short toShort(Object obj,
                            short defaultVal)

toWrapShort

public static Short toWrapShort(Object obj)

toInt

public static int toInt(Object obj)

toInt

public static int toInt(Object obj,
                        int defaultVal)

toWrapInt

public static Integer toWrapInt(Object obj)

toLong

public static long toLong(Object obj)

toLong

public static long toLong(Object obj,
                          long defaultVal)

toWrapLong

public static Long toWrapLong(Object obj)

toFloat

public static float toFloat(Object obj)

toFloat

public static float toFloat(Object obj,
                            float defaultVal)

toWrapFloat

public static Float toWrapFloat(Object obj)

toDouble

public static double toDouble(Object obj)

toDouble

public static double toDouble(Object obj,
                              double defaultVal)

toWrapDouble

public static Double toWrapDouble(Object obj)

scale

public static double scale(Object value,
                           int scale)

数字精度化

参数:

value -

scale -

返回:

lower

public static double lower(double value,
                           int pow)

向下转单位

参数:

value -

pow -

返回:

lower

public static double lower(double value,
                           int pow,
                           int scale)

upper

public static double upper(double value,
                           int pow)

向上转单位

参数:

value -

pow -

返回:

upper

public static double upper(double value,
                           int pow,
                           int scale)

percent

public static String percent(double numerator,
                             double denominator,
                             int scale)

百分比

参数:

numerator -

denominator -

scale -

返回:

percent

public static String percent(double value,
                             int scale)

百分比

参数:

value -

scale -

返回:

format

public static String format(Object obj)

数字格式化

参数:

obj -

返回:

format

public static String format(Object obj,
                            String format)

数字格式化

参数:

obj -

format -

返回:

format

public static String format(double d,
                            int scale)

Returns a string value of double

参数:

d - the double value

scale - the scale

返回:

a string

bound

public static int bound(Integer value,
                        int min,
                        int max)

区间取值

参数:

value -

min -

max -

返回:

sum

public static int sum(Integer a,
                      Integer b)

sum

public static long sum(Long a,
                       Long b)

sum

public static double sum(Double a,
                         Double b)

slice

public static int[] slice(int quantity,
                          int segment)

分片

   slice(0 , 2)  ->  [0, 0]
   slice(2 , 3)  ->  [1, 1, 0]
   slice(3 , 1)  ->  [3]
   slice(9 , 3)  ->  [3, 3, 3]
   slice(10, 3)  ->  [4, 3, 3]
   slice(11, 3)  ->  [4, 4, 3]
   slice(12, 3)  ->  [4, 4, 4]
 

参数:

quantity -

segment -

返回:

partition

public static List<Tuple2<Integer,Integer>> partition(int number,
                                                      int size)

Partition the number

   partition( 0, 2)  ->  [(0, 0)]
   partition( 2, 3)  ->  [(0, 0), (1, 1)]
   partition( 3, 1)  ->  [(0, 2)]
   partition( 9, 3)  ->  [(0, 2), (3, 5), (6, 8)]
   partition(10, 3)  ->  [(0, 3), (4, 6), (7, 9)]
   partition(11, 3)  ->  [(0, 3), (4, 7), (8, 10)]
   partition(12, 3)  ->  [(0, 3), (4, 7), (8, 11)]
 

参数:

number - the number

size - the size

返回:

array

split

public static int[] split(Long orderId,
                          int[] bills,
                          int value)

Split the bill for coupon amount
split(new int[]{249, 249, 249, 3}, 748) -> [249, 249, 248, 2]

参数:

bills - the bills

value - the coupon amount value

返回:

split result

equals

public static boolean equals(Long a,
                             Integer b)

Returns the Long object is equals the Integer object

参数:

a - the Long a

b - the Integer b

返回:

if is equals then return true

toHex

public static String toHex(BigInteger num)

To upper hex string and remove prefix 0

参数:

num - the BigInteger

返回:

upper hex string