MathContext

java.lang.Object
- java.math.MathContext

All Implemented Interfaces:

Serializable
```
public final class MathContext
extends Object
implements Serializable
```
Immutable objects which encapsulate the context settings which describe certain rules for numerical operators, such as those implemented by the BigDecimal class.
The base-independent settings are:
1. precision: the number of digits to be used for an operation; results are rounded to this precision
2. roundingMode: a RoundingMode object which specifies the algorithm to be used for rounding.
Since:

1.5

Author:

Mike Cowlishaw, Joseph D. Darcy

See Also:

BigDecimal, RoundingMode, Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static MathContext`	`DECIMAL128` A `MathContext` object with a precision setting matching the IEEE 754R Decimal128 format, 34 digits, and a rounding mode of `HALF_EVEN`, the IEEE 754R default.
`static MathContext`	`DECIMAL32` A `MathContext` object with a precision setting matching the IEEE 754R Decimal32 format, 7 digits, and a rounding mode of `HALF_EVEN`, the IEEE 754R default.
`static MathContext`	`DECIMAL64` A `MathContext` object with a precision setting matching the IEEE 754R Decimal64 format, 16 digits, and a rounding mode of `HALF_EVEN`, the IEEE 754R default.
`static MathContext`	`UNLIMITED` A `MathContext` object whose settings have the values required for unlimited precision arithmetic.

Constructor Summary

Constructors
Constructor and Description
`MathContext(int setPrecision)` Constructs a new `MathContext` with the specified precision and the `HALF_UP` rounding mode.
`MathContext(int setPrecision, RoundingMode setRoundingMode)` Constructs a new `MathContext` with a specified precision and rounding mode.
`MathContext(String val)` Constructs a new `MathContext` from a string.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object x)` Compares this `MathContext` with the specified `Object` for equality.
`int`	`getPrecision()` Returns the `precision` setting.
`RoundingMode`	`getRoundingMode()` Returns the roundingMode setting.
`int`	`hashCode()` Returns the hash code for this `MathContext`.
`String`	`toString()` Returns the string representation of this `MathContext`.

Methods inherited from class java.lang.Object
clone, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - DECIMAL128
```
public static final MathContext DECIMAL128
```
    A MathContext object with a precision setting matching the IEEE 754R Decimal128 format, 34 digits, and a rounding mode of HALF_EVEN, the IEEE 754R default.
  - DECIMAL32
```
public static final MathContext DECIMAL32
```
    A MathContext object with a precision setting matching the IEEE 754R Decimal32 format, 7 digits, and a rounding mode of HALF_EVEN, the IEEE 754R default.
  - DECIMAL64
```
public static final MathContext DECIMAL64
```
    A MathContext object with a precision setting matching the IEEE 754R Decimal64 format, 16 digits, and a rounding mode of HALF_EVEN, the IEEE 754R default.
  - UNLIMITED
```
public static final MathContext UNLIMITED
```
    A MathContext object whose settings have the values required for unlimited precision arithmetic. The values of the settings are: precision=0 roundingMode=HALF_UP
- Constructor Detail
  - MathContext
```
public MathContext(int setPrecision)
```
    Constructs a new MathContext with the specified precision and the HALF_UP rounding mode.
    
    Parameters:
    
    setPrecision - The non-negative int precision setting.
    
    Throws:
    
    IllegalArgumentException - if the setPrecision parameter is less than zero.
  - MathContext
```
public MathContext(int setPrecision,
                   RoundingMode setRoundingMode)
```
    Constructs a new MathContext with a specified precision and rounding mode.
    
    Parameters:
    
    setPrecision - The non-negative int precision setting.
    
    setRoundingMode - The rounding mode to use.
    
    Throws:
    
    IllegalArgumentException - if the setPrecision parameter is less than zero.
    
    NullPointerException - if the rounding mode argument is null
  - MathContext
```
public MathContext(String val)
```
    Constructs a new MathContext from a string. The string must be in the same format as that produced by the toString() method.
    An IllegalArgumentException is thrown if the precision section of the string is out of range (< 0 ) or the string is not in the format created by the toString() method.
    
    Parameters:
    
    val - The string to be parsed
    
    Throws:
    
    IllegalArgumentException - if the precision section is out of range or of incorrect format
    
    NullPointerException - if the argument is null
- Method Detail
  - equals
```
public boolean equals(@Nullable
                      Object x)
```
    Compares this MathContext with the specified Object for equality.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    x - Object to which this MathContext is to be compared.
    
    Returns:
    
    true if and only if the specified Object is a MathContext object which has exactly the same settings as this object
    
    See Also:
    
    Object.hashCode(), HashMap
  - getPrecision
```
public int getPrecision()
```
    Returns the precision setting. This value is always non-negative.
    
    Returns:
    
    an int which is the value of the precision setting
  - getRoundingMode
```
public RoundingMode getRoundingMode()
```
    Returns the roundingMode setting. This will be one of RoundingMode.CEILING, RoundingMode.DOWN, RoundingMode.FLOOR, RoundingMode.HALF_DOWN, RoundingMode.HALF_EVEN, RoundingMode.HALF_UP, RoundingMode.UNNECESSARY, or RoundingMode.UP.
    
    Returns:
    
    a RoundingMode object which is the value of the roundingMode setting
  - hashCode
```
public int hashCode()
```
    Returns the hash code for this MathContext.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    hash code for this MathContext
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - toString
```
public String toString()
```
    Returns the string representation of this MathContext. The String returned represents the settings of the MathContext object as two space-delimited words (separated by a single space character, '\u0020', and with no leading or trailing white space), as follows:
    1. The string "precision=", immediately followed by the value of the precision setting as a numeric string as if generated by the Integer.toString method.
    2. The string "roundingMode=", immediately followed by the value of the roundingMode setting as a word. This word will be the same as the name of the corresponding public constant in the RoundingMode enum.
    For example:
```
 precision=9 roundingMode=HALF_UP
 
```
    Additional words may be appended to the result of toString in the future if more properties are added to this class.
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a String representing the context settings

Class MathContext

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DECIMAL128

DECIMAL32

DECIMAL64

UNLIMITED

Constructor Detail

MathContext

MathContext

MathContext

Method Detail

equals

getPrecision

getRoundingMode

hashCode

toString