org.apache.commons.math3.fraction

## Class BigFraction

• ### Field Detail

• #### TWO

public static final BigFraction TWO
A fraction representing "2 / 1".
• #### ONE

public static final BigFraction ONE
A fraction representing "1".
• #### ZERO

public static final BigFraction ZERO
A fraction representing "0".
• #### MINUS_ONE

public static final BigFraction MINUS_ONE
A fraction representing "-1 / 1".
• #### FOUR_FIFTHS

public static final BigFraction FOUR_FIFTHS
A fraction representing "4/5".
• #### ONE_FIFTH

public static final BigFraction ONE_FIFTH
A fraction representing "1/5".
• #### ONE_HALF

public static final BigFraction ONE_HALF
A fraction representing "1/2".
• #### ONE_QUARTER

public static final BigFraction ONE_QUARTER
A fraction representing "1/4".
• #### ONE_THIRD

public static final BigFraction ONE_THIRD
A fraction representing "1/3".
• #### THREE_FIFTHS

public static final BigFraction THREE_FIFTHS
A fraction representing "3/5".
• #### THREE_QUARTERS

public static final BigFraction THREE_QUARTERS
A fraction representing "3/4".
• #### TWO_FIFTHS

public static final BigFraction TWO_FIFTHS
A fraction representing "2/5".
• #### TWO_QUARTERS

public static final BigFraction TWO_QUARTERS
A fraction representing "2/4".
• #### TWO_THIRDS

public static final BigFraction TWO_THIRDS
A fraction representing "2/3".
• ### Constructor Detail

• #### BigFraction

public BigFraction(BigInteger num)

Create a BigFraction equivalent to the passed BigInteger, ie "num / 1".

Parameters:
num - the numerator.
• #### BigFraction

public BigFraction(BigInteger num,
BigInteger den)
Create a BigFraction given the numerator and denominator as BigInteger. The BigFraction is reduced to lowest terms.
Parameters:
num - the numerator, must not be null.
den - the denominator, must not be null.
Throws:
ZeroException - if the denominator is zero.
NullArgumentException - if either of the arguments is null
• #### BigFraction

public BigFraction(double value)
throws MathIllegalArgumentException
Create a fraction given the double value.

This constructor behaves differently from BigFraction(double, double, int). It converts the double value exactly, considering its internal bits representation. This works for all values except NaN and infinities and does not requires any loop or convergence threshold.

Since this conversion is exact and since double numbers are sometimes approximated, the fraction created may seem strange in some cases. For example, calling new BigFraction(1.0 / 3.0) does not create the fraction 1/3, but the fraction 6004799503160661 / 18014398509481984 because the double number passed to the constructor is not exactly 1/3 (this number cannot be stored exactly in IEEE754).

Parameters:
value - the double value to convert to a fraction.
Throws:
MathIllegalArgumentException - if value is NaN or infinite
BigFraction(double, double, int)
• #### BigFraction

public BigFraction(double value,
double epsilon,
int maxIterations)
throws FractionConversionException
Create a fraction given the double value and maximum error allowed.

References:

Parameters:
value - the double value to convert to a fraction.
epsilon - maximum error allowed. The resulting fraction is within epsilon of value, in absolute terms.
maxIterations - maximum number of convergents.
Throws:
FractionConversionException - if the continued fraction failed to converge.
BigFraction(double)
• #### BigFraction

public BigFraction(double value,
int maxDenominator)
throws FractionConversionException
Create a fraction given the double value and maximum denominator.

References:

Parameters:
value - the double value to convert to a fraction.
maxDenominator - The maximum allowed value for denominator.
Throws:
FractionConversionException - if the continued fraction failed to converge.
• #### BigFraction

public BigFraction(int num)

Create a BigFraction equivalent to the passed int, ie "num / 1".

Parameters:
num - the numerator.
• #### BigFraction

public BigFraction(int num,
int den)

Create a BigFraction given the numerator and denominator as simple int. The BigFraction is reduced to lowest terms.

Parameters:
num - the numerator.
den - the denominator.
• #### BigFraction

public BigFraction(long num)

Create a BigFraction equivalent to the passed long, ie "num / 1".

Parameters:
num - the numerator.
• #### BigFraction

public BigFraction(long num,
long den)

Create a BigFraction given the numerator and denominator as simple long. The BigFraction is reduced to lowest terms.

Parameters:
num - the numerator.
den - the denominator.
• ### Method Detail

• #### getReducedFraction

public static BigFraction getReducedFraction(int numerator,
int denominator)

Creates a BigFraction instance with the 2 parts of a fraction Y/Z.

Any negative signs are resolved to be on the numerator.

Parameters:
numerator - the numerator, for example the three in 'three sevenths'.
denominator - the denominator, for example the seven in 'three sevenths'.
Returns:
a new fraction instance, with the numerator and denominator reduced.
Throws:
ArithmeticException - if the denominator is zero.

Adds the value of this fraction to the passed integer, returning the result in reduced form.

Parameters:
i - the integer to add.
Returns:
a BigFraction instance with the resulting values.

Adds the value of this fraction to the passed long, returning the result in reduced form.

Parameters:
l - the long to add.
Returns:
a BigFraction instance with the resulting values.
• #### bigDecimalValue

public BigDecimal bigDecimalValue()

Gets the fraction as a BigDecimal. This calculates the fraction as the numerator divided by denominator.

Returns:
the fraction as a BigDecimal.
Throws:
ArithmeticException - if the exact quotient does not have a terminating decimal expansion.
BigDecimal
• #### bigDecimalValue

public BigDecimal bigDecimalValue(int roundingMode)

Gets the fraction as a BigDecimal following the passed rounding mode. This calculates the fraction as the numerator divided by denominator.

Parameters:
roundingMode - rounding mode to apply. see BigDecimal constants.
Returns:
the fraction as a BigDecimal.
Throws:
IllegalArgumentException - if roundingMode does not represent a valid rounding mode.
BigDecimal
• #### bigDecimalValue

public BigDecimal bigDecimalValue(int scale,
int roundingMode)

Gets the fraction as a BigDecimal following the passed scale and rounding mode. This calculates the fraction as the numerator divided by denominator.

Parameters:
scale - scale of the BigDecimal quotient to be returned. see BigDecimal for more information.
roundingMode - rounding mode to apply. see BigDecimal constants.
Returns:
the fraction as a BigDecimal.
BigDecimal
• #### divide

public BigFraction divide(BigInteger bg)

Divide the value of this fraction by the passed BigInteger, ie this * 1 / bg, returning the result in reduced form.

Parameters:
bg - the BigInteger to divide by, must not be null
Returns:
a BigFraction instance with the resulting values
Throws:
NullArgumentException - if the BigInteger is null
MathArithmeticException - if the fraction to divide by is zero
• #### divide

public BigFraction divide(int i)

Divide the value of this fraction by the passed int, ie this * 1 / i, returning the result in reduced form.

Parameters:
i - the int to divide by
Returns:
a BigFraction instance with the resulting values
Throws:
MathArithmeticException - if the fraction to divide by is zero
• #### divide

public BigFraction divide(long l)

Divide the value of this fraction by the passed long, ie this * 1 / l, returning the result in reduced form.

Parameters:
l - the long to divide by
Returns:
a BigFraction instance with the resulting values
Throws:
MathArithmeticException - if the fraction to divide by is zero
• #### doubleValue

public double doubleValue()

Gets the fraction as a double. This calculates the fraction as the numerator divided by denominator.

Specified by:
doubleValue in class Number
Returns:
the fraction as a double
Number.doubleValue()
• #### equals

public boolean equals(Object other)

Test for the equality of two fractions. If the lowest term numerator and denominators are the same for both fractions, the two fractions are considered to be equal.

Overrides:
equals in class Object
Parameters:
other - fraction to test for equality to this fraction, can be null.
Returns:
true if two fractions are equal, false if object is null, not an instance of BigFraction, or not equal to this fraction instance.
Object.equals(java.lang.Object)
• #### floatValue

public float floatValue()

Gets the fraction as a float. This calculates the fraction as the numerator divided by denominator.

Specified by:
floatValue in class Number
Returns:
the fraction as a float.
Number.floatValue()
• #### getDenominator

public BigInteger getDenominator()

Access the denominator as a BigInteger.

Returns:
the denominator as a BigInteger.
• #### getDenominatorAsInt

public int getDenominatorAsInt()

Access the denominator as a int.

Returns:
the denominator as a int.
• #### getDenominatorAsLong

public long getDenominatorAsLong()

Access the denominator as a long.

Returns:
the denominator as a long.
• #### getNumerator

public BigInteger getNumerator()

Access the numerator as a BigInteger.

Returns:
the numerator as a BigInteger.
• #### getNumeratorAsInt

public int getNumeratorAsInt()

Access the numerator as a int.

Returns:
the numerator as a int.
• #### getNumeratorAsLong

public long getNumeratorAsLong()

Access the numerator as a long.

Returns:
the numerator as a long.
• #### hashCode

public int hashCode()

Gets a hashCode for the fraction.

Overrides:
hashCode in class Object
Returns:
a hash code value for this object.
Object.hashCode()
• #### intValue

public int intValue()

Gets the fraction as an int. This returns the whole number part of the fraction.

Specified by:
intValue in class Number
Returns:
the whole number fraction part.
Number.intValue()
• #### longValue

public long longValue()

Gets the fraction as a long. This returns the whole number part of the fraction.

Specified by:
longValue in class Number
Returns:
the whole number fraction part.
Number.longValue()
• #### multiply

public BigFraction multiply(BigInteger bg)

Multiplies the value of this fraction by the passed BigInteger, returning the result in reduced form.

Parameters:
bg - the BigInteger to multiply by.
Returns:
a BigFraction instance with the resulting values.
Throws:
NullArgumentException - if bg is null.
• #### multiply

public BigFraction multiply(int i)

Multiply the value of this fraction by the passed int, returning the result in reduced form.

Specified by:
multiply in interface FieldElement<BigFraction>
Parameters:
i - the int to multiply by.
Returns:
a BigFraction instance with the resulting values.
• #### multiply

public BigFraction multiply(long l)

Multiply the value of this fraction by the passed long, returning the result in reduced form.

Parameters:
l - the long to multiply by.
Returns:
a BigFraction instance with the resulting values.
• #### negate

public BigFraction negate()

Return the additive inverse of this fraction, returning the result in reduced form.

Specified by:
negate in interface FieldElement<BigFraction>
Returns:
the negation of this fraction.
• #### percentageValue

public double percentageValue()

Gets the fraction percentage as a double. This calculates the fraction as the numerator divided by denominator multiplied by 100.

Returns:
the fraction percentage as a double.
• #### pow

public BigFraction pow(int exponent)

Returns a BigFraction whose value is (this<sup>exponent</sup>), returning the result in reduced form.

Parameters:
exponent - exponent to which this BigFraction is to be raised.
Returns:
thisexponent.
• #### pow

public BigFraction pow(long exponent)

Returns a BigFraction whose value is (thisexponent), returning the result in reduced form.

Parameters:
exponent - exponent to which this BigFraction is to be raised.
Returns:
thisexponent as a BigFraction.
• #### pow

public BigFraction pow(BigInteger exponent)

Returns a BigFraction whose value is (thisexponent), returning the result in reduced form.

Parameters:
exponent - exponent to which this BigFraction is to be raised.
Returns:
thisexponent as a BigFraction.
• #### pow

public double pow(double exponent)

Returns a double whose value is (thisexponent), returning the result in reduced form.

Parameters:
exponent - exponent to which this BigFraction is to be raised.
Returns:
thisexponent.
• #### reduce

public BigFraction reduce()

Reduce this BigFraction to its lowest terms.

Returns:
the reduced BigFraction. It doesn't change anything if the fraction can be reduced.
• #### subtract

public BigFraction subtract(BigInteger bg)

Subtracts the value of an BigInteger from the value of this BigFraction, returning the result in reduced form.

Parameters:
bg - the BigInteger to subtract, cannot be null.
Returns:
a BigFraction instance with the resulting values.
Throws:
NullArgumentException - if the BigInteger is null.
• #### subtract

public BigFraction subtract(int i)

Subtracts the value of an integer from the value of this BigFraction, returning the result in reduced form.

Parameters:
i - the integer to subtract.
Returns:
a BigFraction instance with the resulting values.
• #### subtract

public BigFraction subtract(long l)

Subtracts the value of a long from the value of this BigFraction, returning the result in reduced form.

Parameters:
l - the long to subtract.
Returns:
a BigFraction instance with the resulting values.
• #### toString

public String toString()

Returns the String representing this fraction, ie "num / dem" or just "num" if the denominator is one.

Overrides:
toString in class Object
Returns:
a string representation of the fraction.