MathContext 

Introduction

The java.math.MathContext class provides immutable objects which encapsulate the context settings and describes 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.

Class declaration

Following is the declaration for java.math.MathContext class −

public final class MathContext
   extends Object
      implements Serializable

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Field

Following are the fields for java.math.MathContext class −

• 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.

Class constructors

Sr.No.	Constructor & Description
1	MathContext(int setPrecision)This constructor, constructs a new MathContext with the specified precision and the HALF_UP rounding mode.
2	MathContext(int setPrecision, RoundingMode setRoundingMode)This constructor, constructs a new MathContext with a specified precision and rounding mode.
3	MathContext(String val)This constructor, constructs a new MathContext from a string.

Class methods

Sr.No.	Method & Description
1	boolean equals(Object x)This method compares this MathContext with the specified Object for equality.
2	int getPrecision()This method returns the precision setting.
3	RoundingMode getRoundingMode()This method returns the roundingMode setting.
4	int hashCode()This method returns the hash code for this MathContext.
5	String toString()This method returns the string representation of this MathContext.