public
final
class
MathContext
extends Object
implements
Serializable
| java.lang.Object | |
| ↳ | java.math.MathContext |
Immutable objects describing settings such as rounding mode and digit
precision for the numerical operations provided by class BigDecimal.
Fields | |
|---|---|
public
static
final
MathContext |
DECIMAL128
A |
public
static
final
MathContext |
DECIMAL32
A |
public
static
final
MathContext |
DECIMAL64
A |
public
static
final
MathContext |
UNLIMITED
A |
Public constructors | |
|---|---|
MathContext(int precision)
Constructs a new |
|
MathContext(int precision, RoundingMode roundingMode)
Constructs a new |
|
MathContext(String s)
Constructs a new |
|
Public methods | |
|---|---|
boolean
|
equals(Object x)
Returns true if x is a |
int
|
getPrecision()
Returns the precision. |
RoundingMode
|
getRoundingMode()
Returns the rounding mode. |
int
|
hashCode()
Returns the hash code for this |
String
|
toString()
Returns the string representation for this |
Inherited methods | |
|---|---|
 From
class
java.lang.Object
| |
MathContext DECIMAL128
A MathContext which corresponds to the IEEE 754 quadruple
decimal precision format: 34 digit precision and
HALF_EVEN rounding.
MathContext DECIMAL32
A MathContext which corresponds to the IEEE 754 single decimal
precision format: 7 digit precision and HALF_EVEN
rounding.
MathContext DECIMAL64
A MathContext which corresponds to the IEEE 754 double decimal
precision format: 16 digit precision and HALF_EVEN
rounding.
MathContext UNLIMITED
A MathContext for unlimited precision with
HALF_UP rounding.
MathContext (int precision)
Constructs a new MathContext with the specified precision and
with the rounding mode HALF_UP. If the
precision passed is zero, then this implies that the computations have to
be performed exact, the rounding mode in this case is irrelevant.
| Parameters | |
|---|---|
precision |
int:
the precision for the new MathContext. |
| Throws | |
|---|---|
IllegalArgumentException |
if precision < 0.
|
Developers
MathContext (int precision,
RoundingMode roundingMode)
Constructs a new MathContext with the specified precision and
with the specified rounding mode. If the precision passed is zero, then
this implies that the computations have to be performed exact, the
rounding mode in this case is irrelevant.
| Parameters | |
|---|---|
precision |
int:
the precision for the new MathContext. |
roundingMode |
RoundingMode:
the rounding mode for the new MathContext. |
| Throws | |
|---|---|
IllegalArgumentException |
if precision < 0. |
NullPointerException |
if roundingMode is null.
|
MathContext (String s)
Constructs a new MathContext from a string. The string has to
specify the precision and the rounding mode to be used and has to follow
the following syntax: "precision=<precision> roundingMode=<roundingMode>"
This is the same form as the one returned by the toString()
method.
| Parameters | |
|---|---|
s |
String
|
| Throws | |
|---|---|
IllegalArgumentException |
if the string is not in the correct format or if the precision specified is < 0. |
boolean equals (Object x)
Returns true if x is a MathContext with the same precision
setting and the same rounding mode as this MathContext instance.
| Parameters | |
|---|---|
x |
Object:
object to be compared. |
| Returns | |
|---|---|
boolean |
true if this MathContext instance is equal to the
x argument; false otherwise.
|
int getPrecision ()
Returns the precision. The precision is the number of digits used for an operation. Results are rounded to this precision. The precision is guaranteed to be non negative. If the precision is zero, then the computations have to be performed exact, results are not rounded in this case.
| Returns | |
|---|---|
int |
the precision. |
RoundingMode getRoundingMode ()
Returns the rounding mode. The rounding mode is the strategy to be used to round results.
The rounding mode is one of
UP,
DOWN,
CEILING,
FLOOR,
HALF_UP,
HALF_DOWN,
HALF_EVEN, or
UNNECESSARY.
| Returns | |
|---|---|
RoundingMode |
the rounding mode. |
int hashCode ()
Returns the hash code for this MathContext instance.
| Returns | |
|---|---|
int |
the hash code for this MathContext.
|
String toString ()
Returns the string representation for this MathContext instance.
The string has the form
"precision=<precision> roundingMode=<roundingMode>"
where <precision> is an integer describing the number
of digits used for operations and <roundingMode> is the
string representation of the rounding mode.
| Returns | |
|---|---|
String |
a string representation for this MathContext instance
|