MathContext | API reference | Android Developers

Added in API level 1

Summary: Fields | Ctors | Methods | Inherited Methods

MathContext

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:

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

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2025-02-10 UTC.

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MathContext

Summary

Fields

Public constructors

Public methods

Inherited methods

Fields

DECIMAL128

DECIMAL32

DECIMAL64

UNLIMITED

Public constructors

MathContext

MathContext

MathContext

Public methods

equals

getPrecision

getRoundingMode

hashCode

toString

java.lang.Object
↳	java.math.MathContext