NumberUtil (vjkit 1.0.8 API)

java.lang.Object
- com.vip.vjtools.vjkit.number.NumberUtil

```
public class NumberUtil
extends Object
```
数字的工具类. 1.原始类型数字与byte[]的双向转换(via Guava) 2.判断字符串是否数字, 是否16进制字符串(via Common Lang) 3.10机制/16进制字符串与原始类型数字/数字对象的双向转换(参考Common Lang自写)

Constructor Summary

Constructors
Constructor and Description

NumberUtil()

Constructors
Constructor and Description
`NumberUtil()`

Method Summary

Methods
Modifier and Type	Method and Description
`static boolean`	`equalsWithin(double d1, double d2)` 因为double的精度问题, 允许两个double在0.00001内的误差为相等。
`static boolean`	`equalsWithin(double d1, double d2, double epsilon)` 因为double的精度问题, 允许两个double在epsilon内的误差为相等
`static Integer`	`hexToIntObject(String str)` 将16进制的String转化为Integer.
`static Integer`	`hexToIntObject(String str, Integer defaultValue)` 将16进制的String转化为Integer，出错时返回默认值.
`static Long`	`hexToLongObject(String str)` 将16进制的String转化为Long 当str为空或非数字字符串时抛NumberFormatException
`static Long`	`hexToLongObject(String str, Long defaultValue)` 将16进制的String转化为Long，出错时返回默认值.
`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 String`	`to2DigitString(double d)` 输出格式化为小数后两位的double字符串
`static byte[]`	`toBytes(double val)` copy from ElasticSearch Numbers
`static byte[]`	`toBytes(int value)`
`static byte[]`	`toBytes(long value)`
`static double`	`toDouble(byte[] bytes)` copy from ElasticSearch Numbers
`static double`	`toDouble(String str)` 将10进制的String安全的转化为double.
`static double`	`toDouble(String str, double defaultValue)` 将10进制的String安全的转化为double.
`static Double`	`toDoubleObject(String str)` 将10进制的String安全的转化为Double.
`static Double`	`toDoubleObject(String str, Double defaultValue)` 将10进制的String安全的转化为Long.
`static int`	`toInt(byte[] bytes)`
`static int`	`toInt(String str)` 将10进制的String转化为int.
`static int`	`toInt(String str, int defaultValue)` 将10进制的String安全的转化为int.
`static int`	`toInt32(long x)` 安全的将小于Integer.MAX的long转为int，否则抛出IllegalArgumentException异常
`static Integer`	`toIntObject(String str)` 将10进制的String安全的转化为Integer.
`static Integer`	`toIntObject(String str, Integer defaultValue)` 将10进制的String安全的转化为Integer.
`static long`	`toLong(byte[] bytes)`
`static long`	`toLong(String str)` 将10进制的String安全的转化为long.
`static long`	`toLong(String str, long defaultValue)` 将10进制的String安全的转化为long.
`static Long`	`toLongObject(String str)` 将10进制的String安全的转化为Long.
`static Long`	`toLongObject(String str, Long defaultValue)` 将10进制的String安全的转化为Long.
`static String`	`toString(double d)`
`static String`	`toString(Double d)`
`static String`	`toString(int i)`
`static String`	`toString(Integer i)`
`static String`	`toString(long l)`
`static String`	`toString(Long l)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - NumberUtil
```
public NumberUtil()
```
- Method Detail
  - equalsWithin
```
public static boolean equalsWithin(double d1,
                   double d2)
```
    因为double的精度问题, 允许两个double在0.00001内的误差为相等。
  - equalsWithin
```
public static boolean equalsWithin(double d1,
                   double d2,
                   double epsilon)
```
    因为double的精度问题, 允许两个double在epsilon内的误差为相等
  - toBytes
```
public static byte[] toBytes(int value)
```
  - toBytes
```
public static byte[] toBytes(long value)
```
  - toBytes
```
public static byte[] toBytes(double val)
```
    copy from ElasticSearch Numbers
  - toInt
```
public static int toInt(byte[] bytes)
```
  - toLong
```
public static long toLong(byte[] bytes)
```
  - toDouble
```
public static double toDouble(byte[] bytes)
```
    copy from ElasticSearch Numbers
  - 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
  - toInt
```
public static int toInt(String str)
```
    将10进制的String转化为int. 当str为空或非数字字符串时抛NumberFormatException
  - toInt
```
public static int toInt(String str,
        int defaultValue)
```
    将10进制的String安全的转化为int. 当str为空或非数字字符串时，返回default值.
  - toLong
```
public static long toLong(String str)
```
    将10进制的String安全的转化为long. 当str或非数字字符串时抛NumberFormatException
  - toLong
```
public static long toLong(String str,
          long defaultValue)
```
    将10进制的String安全的转化为long. 当str为空或非数字字符串时，返回default值
  - toDouble
```
public static double toDouble(String str)
```
    将10进制的String安全的转化为double. 当str为空或非数字字符串时抛NumberFormatException
  - toDouble
```
public static double toDouble(String str,
              double defaultValue)
```
    将10进制的String安全的转化为double. 当str为空或非数字字符串时，返回default值
  - toIntObject
```
public static Integer toIntObject(String str)
```
    将10进制的String安全的转化为Integer. 当str为空或非数字字符串时抛NumberFormatException
  - toIntObject
```
public static Integer toIntObject(String str,
                  Integer defaultValue)
```
    将10进制的String安全的转化为Integer. 当str为空或非数字字符串时，返回default值
  - toLongObject
```
public static Long toLongObject(String str)
```
    将10进制的String安全的转化为Long. 当str为空或非数字字符串时抛NumberFormatException
  - toLongObject
```
public static Long toLongObject(String str,
                Long defaultValue)
```
    将10进制的String安全的转化为Long. 当str为空或非数字字符串时，返回default值
  - toDoubleObject
```
public static Double toDoubleObject(String str)
```
    将10进制的String安全的转化为Double. 当str为空或非数字字符串时抛NumberFormatException
  - toDoubleObject
```
public static Double toDoubleObject(String str,
                    Double defaultValue)
```
    将10进制的String安全的转化为Long. 当str为空或非数字字符串时，返回default值
  - hexToIntObject
```
public static Integer hexToIntObject(String str)
```
    将16进制的String转化为Integer. 当str为空或非数字字符串时抛NumberFormatException
  - hexToIntObject
```
public static Integer hexToIntObject(String str,
                     Integer defaultValue)
```
    将16进制的String转化为Integer，出错时返回默认值.
  - hexToLongObject
```
public static Long hexToLongObject(String str)
```
    将16进制的String转化为Long 当str为空或非数字字符串时抛NumberFormatException
  - hexToLongObject
```
public static Long hexToLongObject(String str,
                   Long defaultValue)
```
    将16进制的String转化为Long，出错时返回默认值.
  - toString
```
public static String toString(int i)
```
  - toString
```
public static String toString(Integer i)
```
  - toString
```
public static String toString(long l)
```
  - toString
```
public static String toString(Long l)
```
  - toString
```
public static String toString(double d)
```
  - toString
```
public static String toString(Double d)
```
  - to2DigitString
```
public static String to2DigitString(double d)
```
    输出格式化为小数后两位的double字符串
  - toInt32
```
public static int toInt32(long x)
```
    安全的将小于Integer.MAX的long转为int，否则抛出IllegalArgumentException异常

Class NumberUtil

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

NumberUtil

Method Detail

equalsWithin

equalsWithin

toBytes

toBytes

toBytes

toInt

toLong

toDouble

isNumber

isHexNumber

toInt

toInt

toLong

toLong

toDouble

toDouble

toIntObject

toIntObject

toLongObject

toLongObject

toDoubleObject

toDoubleObject

hexToIntObject

hexToIntObject

hexToLongObject

hexToLongObject

toString

toString

toString

toString

toString

toString

to2DigitString

toInt32