com.aoindustries.math

Class BigFraction

java.lang.Object

java.lang.Number

com.aoindustries.math.BigFraction

All Implemented Interfaces:

Serializable, Comparable<BigFraction>

public class BigFraction
extends Number
implements Serializable, Comparable<BigFraction>

Stores arbitrary size fractions by their numerator and denominator.

Author:

AO Industries, Inc.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BigFraction.DistributionMethod

Field Summary

Fields

Modifier and Type	Field and Description
static BigFraction	ONE
static BigFraction	ZERO

Constructor Summary

Constructors

Constructor and Description
BigFraction(BigInteger numerator, BigInteger denominator, boolean displayPercentage)
BigFraction(long numerator, long denominator, boolean displayPercentage)
BigFraction(String value)

Method Summary

Modifier and Type	Method and Description
BigFraction	abs() Gets the absolute value, but is not reduced.
BigFraction	add(BigFraction val) Adds two fractions, returning the value in lowest terms.
int	compareTo(BigFraction o)
static BigDecimal[]	distributeValue(BigDecimal total, BigFraction.DistributionMethod distributionMethod, BigFraction... fractions) Evenly distributes the total value of BigDecimal by fractional amounts.
BigFraction	divide(BigFraction val) Divides two fractions, returning the value in lowest terms.
double	doubleValue()
boolean	equals(Object o) Two fractions are equal when they have both the same numerator, denominator, and displayPercentage.
float	floatValue()
BigDecimal	getBigDecimal(int scale) Gets this fraction as a BigDecimal using RoundingMode.UNNECESSARY
BigDecimal	getBigDecimal(int scale, RoundingMode roundingMode) Gets this fraction as a BigDecimal using the provided rounding mode.
BigInteger	getBigInteger() Gets this fraction as a BigInteger using RoundingMode.UNNECESSARY
BigInteger	getBigInteger(RoundingMode roundingMode) Gets this fraction as a BigInteger using the provided rounding mode.
BigInteger	getDenominator()
BigInteger	getNumerator()
int	hashCode()
int	intValue()
boolean	isDisplayPercentage()
long	longValue()
BigFraction	max(BigFraction val) Gets the higher of the two fractions.
BigFraction	min(BigFraction val) Gets the lower of the two fractions.
BigFraction	multiply(BigFraction val) Multiplies two fractions, returning the value in lowest terms.
BigFraction	negate() Negates the value, but is not reduced.
BigFraction	pow(int exponent) Raises this fraction to the provided exponent, returning the value in lowest terms.
BigFraction	reduce() Reduces this fraction to its lowest terms.
int	signum() Returns the signum function of this BigFraction.
BigFraction	subtract(BigFraction val) Subtracts two fractions, returning the value in lowest terms.
String	toString()
static BigFraction	valueOf(BigDecimal value, boolean displayPercentage) Gets the big decimal as a fraction, reduced.
static BigFraction	valueOf(BigInteger numerator, BigInteger denominator, boolean displayPercentage)
static BigFraction	valueOf(BigInteger value, boolean displayPercentage)
static BigFraction	valueOf(long numerator, long denominator, boolean displayPercentage)

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ZERO

public static final BigFraction ZERO

ONE

public static final BigFraction ONE

Constructor Detail

BigFraction

public BigFraction(String value)
            throws NumberFormatException

Throws:

NumberFormatException

BigFraction

public BigFraction(long numerator,
                   long denominator,
                   boolean displayPercentage)
            throws NumberFormatException

Throws:

NumberFormatException

BigFraction

public BigFraction(BigInteger numerator,
                   BigInteger denominator,
                   boolean displayPercentage)
            throws NumberFormatException

Throws:

NumberFormatException

Method Detail

valueOf

public static BigFraction valueOf(long numerator,
                                  long denominator,
                                  boolean displayPercentage)
                           throws NumberFormatException

Throws:

NumberFormatException

valueOf

public static BigFraction valueOf(BigInteger value,
                                  boolean displayPercentage)
                           throws NumberFormatException

Throws:

NumberFormatException

valueOf

public static BigFraction valueOf(BigDecimal value,
                                  boolean displayPercentage)
                           throws NumberFormatException

Gets the big decimal as a fraction, reduced.

Throws:

NumberFormatException

valueOf

public static BigFraction valueOf(BigInteger numerator,
                                  BigInteger denominator,
                                  boolean displayPercentage)
                           throws NumberFormatException

Throws:

NumberFormatException

distributeValue

public static BigDecimal[] distributeValue(BigDecimal total,
                                           BigFraction.DistributionMethod distributionMethod,
                                           BigFraction... fractions)

Evenly distributes the total value of BigDecimal by fractional amounts.

• The sum of the results will equal total.
• The results will use the same scale as total.
• The results will be rounded where necessary to match the scale of total.
• Each result will be zero or have a sign matching total.

Parameters:

total - The total value to be distributed within the results

fractions - The fractional amount of each result, the sum must be equal to one. The array elements are unmodified.

Returns:

the results corresponding to each fractional amount.

toString

public String toString()

Overrides:

toString in class Object

getNumerator

public BigInteger getNumerator()

getDenominator

public BigInteger getDenominator()

isDisplayPercentage

public boolean isDisplayPercentage()

intValue

public int intValue()

Specified by:

intValue in class Number

longValue

public long longValue()

Specified by:

longValue in class Number

floatValue

public float floatValue()

Specified by:

floatValue in class Number

doubleValue

public double doubleValue()

Specified by:

doubleValue in class Number

getBigInteger

public BigInteger getBigInteger()
                         throws ArithmeticException

Gets this fraction as a BigInteger using RoundingMode.UNNECESSARY

Throws:

ArithmeticException

getBigInteger

public BigInteger getBigInteger(RoundingMode roundingMode)
                         throws ArithmeticException

Gets this fraction as a BigInteger using the provided rounding mode.

Throws:

ArithmeticException

getBigDecimal

public BigDecimal getBigDecimal(int scale)
                         throws ArithmeticException

Gets this fraction as a BigDecimal using RoundingMode.UNNECESSARY

Throws:

ArithmeticException

getBigDecimal

public BigDecimal getBigDecimal(int scale,
                                RoundingMode roundingMode)
                         throws ArithmeticException

Gets this fraction as a BigDecimal using the provided rounding mode.

Throws:

ArithmeticException

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Two fractions are equal when they have both the same numerator, denominator, and displayPercentage. For numerical equality independent of denominator, use compareTo.

Overrides:

equals in class Object

See Also:

compareTo(BigFraction)

compareTo

public int compareTo(BigFraction o)

Specified by:

compareTo in interface Comparable<BigFraction>

reduce

public BigFraction reduce()

Reduces this fraction to its lowest terms.

add

public BigFraction add(BigFraction val)

Adds two fractions, returning the value in lowest terms. If either is a percentage, the result will be a percentage.

subtract

public BigFraction subtract(BigFraction val)

Subtracts two fractions, returning the value in lowest terms. If either is a percentage, the result will be a percentage.

multiply

public BigFraction multiply(BigFraction val)

Multiplies two fractions, returning the value in lowest terms. If both are percentages, the result will be a percentage.

divide

public BigFraction divide(BigFraction val)

Divides two fractions, returning the value in lowest terms.

• If percent divide by percent: percent
• If percent divide by non-percent: percent
• If non-percent divide by percent: non-percent
• If non-percent divide by non-percent: non-percent

negate

public BigFraction negate()

Negates the value, but is not reduced.

abs

public BigFraction abs()

Gets the absolute value, but is not reduced.

max

public BigFraction max(BigFraction val)

Gets the higher of the two fractions. When they are equal the one with the lower denominator is returned. When their denominators are also equal, returns this.

min

public BigFraction min(BigFraction val)

Gets the lower of the two fractions. When they are equal the one with the lower denominator is returned. When their denominators are also equal, returns this.

pow

public BigFraction pow(int exponent)

Raises this fraction to the provided exponent, returning the value in lowest terms.

signum

public int signum()

Returns the signum function of this BigFraction.

Returns:

-1, 0, or 1 as the value of this BigFraction is negative, zero, or positive.