Summary: Fields | Ctors | Methods | Inherited Methods

MathContext

public final class MathContext
extends Object implements Serializable

java.lang.Object
↳	java.math.MathContext

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:

precision: the number of digits to be used for an operation; results are rounded to this precision
roundingMode: a RoundingMode object which specifies the algorithm to be used for rounding.

See also:

BigDecimal
RoundingMode

Summary

Fields
`public static final MathContext`	`DECIMAL128` A `MathContext` object with a precision setting matching the precision of the IEEE 754-2019 decimal128 format, 34 digits, and a rounding mode of `HALF_EVEN`.
`public static final MathContext`	`DECIMAL32` A `MathContext` object with a precision setting matching the precision of the IEEE 754-2019 decimal32 format, 7 digits, and a rounding mode of `HALF_EVEN`.
`public static final MathContext`	`DECIMAL64` A `MathContext` object with a precision setting matching the precision of the IEEE 754-2019 decimal64 format, 16 digits, and a rounding mode of `HALF_EVEN`.
`public static final MathContext`	`UNLIMITED` A `MathContext` object whose settings have the values required for unlimited precision arithmetic.

Public constructors
`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.

Public methods
`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`.

Inherited methods

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Fields

DECIMAL128

Added in API level 1

 public static final MathContext DECIMAL128

A MathContext object with a precision setting matching the precision of the IEEE 754-2019 decimal128 format, 34 digits, and a rounding mode of HALF_EVEN. Note the exponent range of decimal64 is not used for rounding.

DECIMAL32

Added in API level 1

 public static final MathContext DECIMAL32

A MathContext object with a precision setting matching the precision of the IEEE 754-2019 decimal32 format, 7 digits, and a rounding mode of HALF_EVEN. Note the exponent range of decimal32 is not used for rounding.

DECIMAL64

Added in API level 1

 public static final MathContext DECIMAL64

A MathContext object with a precision setting matching the precision of the IEEE 754-2019 decimal64 format, 16 digits, and a rounding mode of HALF_EVEN. Note the exponent range of decimal64 is not used for rounding.

UNLIMITED

Added in API level 1

 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

Public constructors

MathContext

Added in API level 1

 public MathContext (int setPrecision)

Constructs a new MathContext with the specified precision and the HALF_UP rounding mode.

Parameters
`setPrecision`	`int`: The non-negative `int` precision setting.

Throws
`IllegalArgumentException`	if the `setPrecision` parameter is less than zero.

MathContext

Added in API level 1

 public MathContext (int setPrecision, RoundingMode setRoundingMode)

Constructs a new MathContext with a specified precision and rounding mode.

Parameters
`setPrecision`	`int`: The non-negative `int` precision setting.
`setRoundingMode`	`RoundingMode`: The rounding mode to use.

Throws
`IllegalArgumentException`	if the `setPrecision` parameter is less than zero.
`NullPointerException`	if the rounding mode argument is `null`

MathContext

Added in API level 1

 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`	`String`: 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`

Public methods

equals

Added in API level 1

 public boolean equals (Object x)

Compares this MathContext with the specified Object for equality.

Parameters
`x`	`Object`: `Object` to which this `MathContext` is to be compared.

Returns
`boolean`	`true` if and only if the specified `Object` is a `MathContext` object which has exactly the same settings as this object

getPrecision

Added in API level 1

 public int getPrecision ()

Returns the precision setting. This value is always non-negative.

Returns
`int`	an `int` which is the value of the `precision` setting

getRoundingMode

Added in API level 1

 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
`RoundingMode`	a `RoundingMode` object which is the value of the `roundingMode` setting

hashCode

Added in API level 1

 public int hashCode ()

Returns the hash code for this MathContext.

Returns
`int`	hash code for this `MathContext`

toString

Added in API level 1

 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:

The string "precision=", immediately followed by the value of the precision setting as a numeric string as if generated by the Integer.toString method.
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.

Returns
`String`	a `String` representing the context settings