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## org.apache.commons.lang3.math
Class NumberUtils

    java.lang.Object
      org.apache.commons.lang3.math.NumberUtils

    public class NumberUtils

extends Object

Provides extra functionality for Java Number classes.

Since:
  2.0
Version:
  $Id: NumberUtils.java 916081 2010-02-25 01:28:13Z niallp $
Author:
  Apache Software Foundation, Rand McNeely, Steve Downey, Eric Pugh, Phil Steitz, Matthew Hawthorne, Gary Gregory, Fredrik Westermarck

Field Summary
`static Byte` | `BYTE_MINUS_ONE` Reusable Byte constant for minus one.
`static Byte` | `BYTE_ONE` Reusable Byte constant for one.
`static Byte` | `BYTE_ZERO` Reusable Byte constant for zero.
`static Double` | `DOUBLE_MINUS_ONE` Reusable Double constant for minus one.
`static Double` | `DOUBLE_ONE` Reusable Double constant for one.
`static Double` | `DOUBLE_ZERO` Reusable Double constant for zero.
`static Float` | `FLOAT_MINUS_ONE` Reusable Float constant for minus one.
`static Float` | `FLOAT_ONE` Reusable Float constant for one.
`static Float` | `FLOAT_ZERO` Reusable Float constant for zero.
`static Integer` | `INTEGER_MINUS_ONE` Reusable Integer constant for minus one.
`static Integer` | `INTEGER_ONE` Reusable Integer constant for one.
`static Integer` | `INTEGER_ZERO` Reusable Integer constant for zero.
`static Long` | `LONG_MINUS_ONE` Reusable Long constant for minus one.
`static Long` | `LONG_ONE` Reusable Long constant for one.
`static Long` | `LONG_ZERO` Reusable Long constant for zero.
`static Short` | `SHORT_MINUS_ONE` Reusable Short constant for minus one.
`static Short` | `SHORT_ONE` Reusable Short constant for one.
`static Short` | `SHORT_ZERO` Reusable Short constant for zero.

Constructor Summary
`NumberUtils()` `NumberUtils` instances should NOT be constructed in standard programming.

Method Summary
`static BigDecimal` | `createBigDecimal(String str)` Convert a `String` to a `BigDecimal`.
`static BigInteger` | `createBigInteger(String str)` Convert a `String` to a `BigInteger`.
`static Double` | `createDouble(String str)` Convert a `String` to a `Double`.
`static Float` | `createFloat(String str)` Convert a `String` to a `Float`.
`static Integer` | `createInteger(String str)` Convert a `String` to a `Integer`, handling hex and octal notations.
`static Long` | `createLong(String str)` Convert a `String` to a `Long`.
`static Number` | `createNumber(String str)` Turns a string value into a java.lang.Number.
`static boolean` | `isDigits(String str)` Checks whether the `String` contains only digit characters.
`static boolean` | `isNumber(String str)` Checks whether the String a valid Java number.
`static byte` | `max(byte[] array)` Returns the maximum value in an array.
`static byte` | `max(byte a, byte b, byte c)` Gets the maximum of three `byte` values.
`static double` | `max(double[] array)` Returns the maximum value in an array.
`static double` | `max(double a, double b, double c)` Gets the maximum of three `double` values.
`static float` | `max(float[] array)` Returns the maximum value in an array.
`static float` | `max(float a, float b, float c)` Gets the maximum of three `float` values.
`static int` | `max(int[] array)` Returns the maximum value in an array.
`static int` | `max(int a, int b, int c)` Gets the maximum of three `int` values.
`static long` | `max(long[] array)` Returns the maximum value in an array.
`static long` | `max(long a, long b, long c)` Gets the maximum of three `long` values.
`static short` | `max(short[] array)` Returns the maximum value in an array.
`static short` | `max(short a, short b, short c)` Gets the maximum of three `short` values.
`static byte` | `min(byte[] array)` Returns the minimum value in an array.
`static byte` | `min(byte a, byte b, byte c)` Gets the minimum of three `byte` values.
`static double` | `min(double[] array)` Returns the minimum value in an array.
`static double` | `min(double a, double b, double c)` Gets the minimum of three `double` values.
`static float` | `min(float[] array)` Returns the minimum value in an array.
`static float` | `min(float a, float b, float c)` Gets the minimum of three `float` values.
`static int` | `min(int[] array)` Returns the minimum value in an array.
`static int` | `min(int a, int b, int c)` Gets the minimum of three `int` values.
`static long` | `min(long[] array)` Returns the minimum value in an array.
`static long` | `min(long a, long b, long c)` Gets the minimum of three `long` values.
`static short` | `min(short[] array)` Returns the minimum value in an array.
`static short` | `min(short a, short b, short c)` Gets the minimum of three `short` values.
`static byte` | `toByte(String str)` Convert a `String` to a `byte`, returning `zero` if the conversion fails.
`static byte` | `toByte(String str, byte defaultValue)` Convert a `String` to a `byte`, returning a default value if the conversion fails.
`static double` | `toDouble(String str)` Convert a `String` to a `double`, returning `0.0d` if the conversion fails.
`static double` | `toDouble(String str, double defaultValue)` Convert a `String` to a `double`, returning a default value if the conversion fails.
`static float` | `toFloat(String str)` Convert a `String` to a `float`, returning `0.0f` if the conversion fails.
`static float` | `toFloat(String str, float defaultValue)` Convert a `String` to a `float`, returning a default value if the conversion fails.
`static int` | `toInt(String str)` Convert a `String` to an `int`, returning `zero` if the conversion fails.
`static int` | `toInt(String str, int defaultValue)` Convert a `String` to an `int`, returning a default value if the conversion fails.
`static long` | `toLong(String str)` Convert a `String` to a `long`, returning `zero` if the conversion fails.
`static long` | `toLong(String str, long defaultValue)` Convert a `String` to a `long`, returning a default value if the conversion fails.
`static short` | `toShort(String str)` Convert a `String` to a `short`, returning `zero` if the conversion fails.
`static short` | `toShort(String str, short defaultValue)` Convert a `String` to an `short`, returning a default value if the conversion fails.

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

Field Detail

### LONG_ZERO

    public static final Long LONG_ZERO

  Reusable Long constant for zero.

### LONG_ONE

    public static final Long LONG_ONE

  Reusable Long constant for one.

### LONG_MINUS_ONE

    public static final Long LONG_MINUS_ONE

  Reusable Long constant for minus one.

### INTEGER_ZERO

    public static final Integer INTEGER_ZERO

  Reusable Integer constant for zero.

### INTEGER_ONE

    public static final Integer INTEGER_ONE

  Reusable Integer constant for one.

### INTEGER_MINUS_ONE

    public static final Integer INTEGER_MINUS_ONE

  Reusable Integer constant for minus one.

### SHORT_ZERO

    public static final Short SHORT_ZERO

  Reusable Short constant for zero.

### SHORT_ONE

    public static final Short SHORT_ONE

  Reusable Short constant for one.

### SHORT_MINUS_ONE

    public static final Short SHORT_MINUS_ONE

  Reusable Short constant for minus one.

### BYTE_ZERO

    public static final Byte BYTE_ZERO

  Reusable Byte constant for zero.

### BYTE_ONE

    public static final Byte BYTE_ONE

  Reusable Byte constant for one.

### BYTE_MINUS_ONE

    public static final Byte BYTE_MINUS_ONE

  Reusable Byte constant for minus one.

### DOUBLE_ZERO

    public static final Double DOUBLE_ZERO

  Reusable Double constant for zero.

### DOUBLE_ONE

    public static final Double DOUBLE_ONE

  Reusable Double constant for one.

### DOUBLE_MINUS_ONE

    public static final Double DOUBLE_MINUS_ONE

  Reusable Double constant for minus one.

### FLOAT_ZERO

    public static final Float FLOAT_ZERO

  Reusable Float constant for zero.

### FLOAT_ONE

    public static final Float FLOAT_ONE

  Reusable Float constant for one.

### FLOAT_MINUS_ONE

    public static final Float FLOAT_MINUS_ONE

  Reusable Float constant for minus one.

Constructor Detail

### NumberUtils

    public NumberUtils()

  `NumberUtils` instances should NOT be constructed in standard programming. Instead, the class should be used as `NumberUtils.toInt("6");`.

  This constructor is public to permit tools that require a JavaBean instance to operate.

Method Detail

### toInt

    public static int toInt(String str)

  Convert a `String` to an `int`, returning `zero` if the conversion fails.

  If the string is `null`, `zero` is returned.

         NumberUtils.toInt(null) = 0
         NumberUtils.toInt("")   = 0
         NumberUtils.toInt("1")  = 1

  Parameters:
    `str` - the string to convert, may be null
  Returns:
    the int represented by the string, or `zero` if conversion fails
  Since:
    2.1

### toInt

    public static int toInt(String str,
                            int defaultValue)

  Convert a `String` to an `int`, returning a default value if the conversion fails.

  If the string is `null`, the default value is returned.

         NumberUtils.toInt(null, 1) = 1
         NumberUtils.toInt("", 1)   = 1
         NumberUtils.toInt("1", 0)  = 1

  Parameters:
    `str` - the string to convert, may be null
    `defaultValue` - the default value
  Returns:
    the int represented by the string, or the default if conversion fails
  Since:
    2.1

### toLong

    public static long toLong(String str)

  Convert a `String` to a `long`, returning `zero` if the conversion fails.

  If the string is `null`, `zero` is returned.

         NumberUtils.toLong(null) = 0L
         NumberUtils.toLong("")   = 0L
         NumberUtils.toLong("1")  = 1L

  Parameters:
    `str` - the string to convert, may be null
  Returns:
    the long represented by the string, or `0` if conversion fails
  Since:
    2.1

### toLong

    public static long toLong(String str,
                              long defaultValue)

  Convert a `String` to a `long`, returning a default value if the conversion fails.

  If the string is `null`, the default value is returned.

         NumberUtils.toLong(null, 1L) = 1L
         NumberUtils.toLong("", 1L)   = 1L
         NumberUtils.toLong("1", 0L)  = 1L

  Parameters:
    `str` - the string to convert, may be null
    `defaultValue` - the default value
  Returns:
    the long represented by the string, or the default if conversion fails
  Since:
    2.1

### toFloat

    public static float toFloat(String str)

  Convert a `String` to a `float`, returning `0.0f` if the conversion fails.

  If the string `str` is `null`, `0.0f` is returned.

         NumberUtils.toFloat(null)   = 0.0f
         NumberUtils.toFloat("")     = 0.0f
         NumberUtils.toFloat("1.5")  = 1.5f

  Parameters:
    `str` - the string to convert, may be `null`
  Returns:
    the float represented by the string, or `0.0f` if conversion fails
  Since:
    2.1

### toFloat

    public static float toFloat(String str,
                                float defaultValue)

  Convert a `String` to a `float`, returning a default value if the conversion fails.

  If the string `str` is `null`, the default value is returned.

         NumberUtils.toFloat(null, 1.1f)   = 1.0f
         NumberUtils.toFloat("", 1.1f)     = 1.1f
         NumberUtils.toFloat("1.5", 0.0f)  = 1.5f

  Parameters:
    `str` - the string to convert, may be `null`
    `defaultValue` - the default value
  Returns:
    the float represented by the string, or defaultValue if conversion fails
  Since:
    2.1

### toDouble

    public static double toDouble(String str)

  Convert a `String` to a `double`, returning `0.0d` if the conversion fails.

  If the string `str` is `null`, `0.0d` is returned.

         NumberUtils.toDouble(null)   = 0.0d
         NumberUtils.toDouble("")     = 0.0d
         NumberUtils.toDouble("1.5")  = 1.5d

  Parameters:
    `str` - the string to convert, may be `null`
  Returns:
    the double represented by the string, or `0.0d` if conversion fails
  Since:
    2.1

### toDouble

    public static double toDouble(String str,
                                  double defaultValue)

  Convert a `String` to a `double`, returning a default value if the conversion fails.

  If the string `str` is `null`, the default value is returned.

         NumberUtils.toDouble(null, 1.1d)   = 1.1d
         NumberUtils.toDouble("", 1.1d)     = 1.1d
         NumberUtils.toDouble("1.5", 0.0d)  = 1.5d

  Parameters:
    `str` - the string to convert, may be `null`
    `defaultValue` - the default value
  Returns:
    the double represented by the string, or defaultValue if conversion fails
  Since:
    2.1

### toByte

    public static byte toByte(String str)

  Convert a `String` to a `byte`, returning `zero` if the conversion fails.

  If the string is `null`, `zero` is returned.

         NumberUtils.toByte(null) = 0
         NumberUtils.toByte("")   = 0
         NumberUtils.toByte("1")  = 1

  Parameters:
    `str` - the string to convert, may be null
  Returns:
    the byte represented by the string, or `zero` if conversion fails
  Since:
    2.5

### toByte

    public static byte toByte(String str,
                              byte defaultValue)

  Convert a `String` to a `byte`, returning a default value if the conversion fails.

  If the string is `null`, the default value is returned.

         NumberUtils.toByte(null, 1) = 1
         NumberUtils.toByte("", 1)   = 1
         NumberUtils.toByte("1", 0)  = 1

  Parameters:
    `str` - the string to convert, may be null
    `defaultValue` - the default value
  Returns:
    the byte represented by the string, or the default if conversion fails
  Since:
    2.5

### toShort

    public static short toShort(String str)

  Convert a `String` to a `short`, returning `zero` if the conversion fails.

  If the string is `null`, `zero` is returned.

         NumberUtils.toShort(null) = 0
         NumberUtils.toShort("")   = 0
         NumberUtils.toShort("1")  = 1

  Parameters:
    `str` - the string to convert, may be null
  Returns:
    the short represented by the string, or `zero` if conversion fails
  Since:
    2.5

### toShort

    public static short toShort(String str,
                                short defaultValue)

  Convert a `String` to an `short`, returning a default value if the conversion fails.

  If the string is `null`, the default value is returned.

         NumberUtils.toShort(null, 1) = 1
         NumberUtils.toShort("", 1)   = 1
         NumberUtils.toShort("1", 0)  = 1

  Parameters:
    `str` - the string to convert, may be null
    `defaultValue` - the default value
  Returns:
    the short represented by the string, or the default if conversion fails
  Since:
    2.5

### createNumber

    public static Number createNumber(String str)
                               throws NumberFormatException

  Turns a string value into a java.lang.Number.

  First, the value is examined for a type qualifier on the end (`'f','F','d','D','l','L'`). If it is found, it starts trying to create successively larger types from the type specified until one is found that can represent the value.

  If a type specifier is not found, it will check for a decimal point and then try successively larger types from `Integer` to `BigInteger` and from `Float` to `BigDecimal`.

  If the string starts with `0x` or `-0x`, it will be interpreted as a hexadecimal integer. Values with leading `0`'s will not be interpreted as octal.

  Returns `null` if the string is `null`.

  This method does not trim the input string, i.e., strings with leading or trailing spaces will generate NumberFormatExceptions.

  Parameters:
    `str` - String containing a number, may be null
  Returns:
    Number created from the string
  Throws:
    `NumberFormatException` - if the value cannot be converted

### createFloat

    public static Float createFloat(String str)

  Convert a `String` to a `Float`.

  Returns `null` if the string is `null`.

  Parameters:
    `str` - a `String` to convert, may be null
  Returns:
    converted `Float`
  Throws:
    `NumberFormatException` - if the value cannot be converted

### createDouble

    public static Double createDouble(String str)

  Convert a `String` to a `Double`.

  Returns `null` if the string is `null`.

  Parameters:
    `str` - a `String` to convert, may be null
  Returns:
    converted `Double`
  Throws:
    `NumberFormatException` - if the value cannot be converted

### createInteger

    public static Integer createInteger(String str)

  Convert a `String` to a `Integer`, handling hex and octal notations.

  Returns `null` if the string is `null`.

  Parameters:
    `str` - a `String` to convert, may be null
  Returns:
    converted `Integer`
  Throws:
    `NumberFormatException` - if the value cannot be converted

### createLong

    public static Long createLong(String str)

  Convert a `String` to a `Long`.

  Returns `null` if the string is `null`.

  Parameters:
    `str` - a `String` to convert, may be null
  Returns:
    converted `Long`
  Throws:
    `NumberFormatException` - if the value cannot be converted

### createBigInteger

    public static BigInteger createBigInteger(String str)

  Convert a `String` to a `BigInteger`.

  Returns `null` if the string is `null`.

  Parameters:
    `str` - a `String` to convert, may be null
  Returns:
    converted `BigInteger`
  Throws:
    `NumberFormatException` - if the value cannot be converted

### createBigDecimal

    public static BigDecimal createBigDecimal(String str)

  Convert a `String` to a `BigDecimal`.

  Returns `null` if the string is `null`.

  Parameters:
    `str` - a `String` to convert, may be null
  Returns:
    converted `BigDecimal`
  Throws:
    `NumberFormatException` - if the value cannot be converted

### min

    public static long min(long[] array)

  Returns the minimum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### min

    public static int min(int[] array)

  Returns the minimum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### min

    public static short min(short[] array)

  Returns the minimum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### min

    public static byte min(byte[] array)

  Returns the minimum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### min

    public static double min(double[] array)

  Returns the minimum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty
  See Also:
    `IEEE754rUtils for a version of this method that handles NaN differently`

### min

    public static float min(float[] array)

  Returns the minimum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty
  See Also:
    `IEEE754rUtils for a version of this method that handles NaN differently`

### max

    public static long max(long[] array)

  Returns the maximum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### max

    public static int max(int[] array)

  Returns the maximum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### max

    public static short max(short[] array)

  Returns the maximum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### max

    public static byte max(byte[] array)

  Returns the maximum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty

### max

    public static double max(double[] array)

  Returns the maximum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty
  See Also:
    `IEEE754rUtils for a version of this method that handles NaN differently`

### max

    public static float max(float[] array)

  Returns the maximum value in an array.

  Parameters:
    `array` - an array, must not be null or empty
  Returns:
    the minimum value in the array
  Throws:
    `IllegalArgumentException` - if `array` is `null`
    `IllegalArgumentException` - if `array` is empty
  See Also:
    `IEEE754rUtils for a version of this method that handles NaN differently`

### min

    public static long min(long a,
                           long b,
                           long c)

  Gets the minimum of three `long` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the smallest of the values

### min

    public static int min(int a,
                          int b,
                          int c)

  Gets the minimum of three `int` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the smallest of the values

### min

    public static short min(short a,
                            short b,
                            short c)

  Gets the minimum of three `short` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the smallest of the values

### min

    public static byte min(byte a,
                           byte b,
                           byte c)

  Gets the minimum of three `byte` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the smallest of the values

### min

    public static double min(double a,
                             double b,
                             double c)

  Gets the minimum of three `double` values.

  If any value is `NaN`, `NaN` is returned. Infinity is handled.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the smallest of the values
  See Also:
    `for a version of this method that handles NaN differently`

### min

    public static float min(float a,
                            float b,
                            float c)

  Gets the minimum of three `float` values.

  If any value is `NaN`, `NaN` is returned. Infinity is handled.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the smallest of the values
  See Also:
    `for a version of this method that handles NaN differently`

### max

    public static long max(long a,
                           long b,
                           long c)

  Gets the maximum of three `long` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the largest of the values

### max

    public static int max(int a,
                          int b,
                          int c)

  Gets the maximum of three `int` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the largest of the values

### max

    public static short max(short a,
                            short b,
                            short c)

  Gets the maximum of three `short` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the largest of the values

### max

    public static byte max(byte a,
                           byte b,
                           byte c)

  Gets the maximum of three `byte` values.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the largest of the values

### max

    public static double max(double a,
                             double b,
                             double c)

  Gets the maximum of three `double` values.

  If any value is `NaN`, `NaN` is returned. Infinity is handled.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the largest of the values
  See Also:
    `for a version of this method that handles NaN differently`

### max

    public static float max(float a,
                            float b,
                            float c)

  Gets the maximum of three `float` values.

  If any value is `NaN`, `NaN` is returned. Infinity is handled.

  Parameters:
    `a` - value 1
    `b` - value 2
    `c` - value 3
  Returns:
    the largest of the values
  See Also:
    `for a version of this method that handles NaN differently`

### isDigits

    public static boolean isDigits(String str)

  Checks whether the `String` contains only digit characters.

  `Null` and empty String will return `false`.

  Parameters:
    `str` - the `String` to check
  Returns:
    `true` if str contains only unicode numeric

### isNumber

    public static boolean isNumber(String str)

  Checks whether the String a valid Java number.

  Valid numbers include hexadecimal marked with the `0x` qualifier, scientific notation and numbers marked with a type qualifier (e.g. 123L).

  `Null` and empty String will return `false`.

  Parameters:
    `str` - the `String` to check
  Returns:
    `true` if the string is a correctly formatted number

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