nl.knowledgeplaza.math
Class Fraction

java.lang.Object
  java.lang.Number
      nl.knowledgeplaza.math.Fraction

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Comparable

public class Fraction
extends java.lang.Number
implements java.lang.Comparable, java.lang.Cloneable

This class tries to mimick the calculating as we to it in school and not on computers. So 0.5 is 1/2 and 0.333333... does not exist but is 1/3. In this way it tries to remove those strange behaviors like zero not being equal to zero (0.00 != 0). This is especially frustrating when using binding libraries. And it tries to remove as much rounding as possible, thus minimizing those calculation errors. By only rounding when presenting the final result, not during calculation.

Author:

tbee

See Also:

Serialized Form

Field Summary

static Fraction	ONE
static Fraction	ZERO

Constructor Summary

Fraction()
Default is zero

Fraction(java.math.BigDecimal value)

Fraction(java.math.BigInteger value)

Fraction(java.math.BigInteger bi1, java.math.BigInteger bi2)

Fraction(double value)

Fraction(float value)

Fraction(Fraction f)

Fraction(int value)

Fraction(int value, int divider)

Fraction(long value)

Fraction(java.lang.String value)

Method Summary

Fraction	abs() positive value
Fraction	add(Fraction other)
java.lang.String	asString() Simplify and return as fraction string notation, e.g.
java.lang.String	asString2() Simplify and return as integer+(fraction) string notation, e.g 1+(2/3)
java.lang.String	asStringRaw() Return as fraction string notation, e.g.
java.math.BigDecimal	bigDecimalValue() Return a BigDecimal with scale 10 and rounding half up
java.math.BigDecimal	bigDecimalValue(int scale, int rounding) Return a big decimal with the specified scale (if the conversion requires a divide)
java.lang.Object	clone()
int	compareTo(java.lang.Object o) Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object
Fraction	div(Fraction an)
Fraction	divide(Fraction other)
double	doubleValue()
boolean	equals(java.lang.Object an)
float	floatValue()
Fraction	fraction() Get only the fraction bit
void	fractionalize(int precision) TODO: Find the nearest fraction e.g.
java.math.BigInteger	getDenominator()
java.math.BigInteger	getDivider()
java.math.BigInteger	getNumerator()
java.math.BigInteger	getValue()
Fraction	integer() Lose the fraction bit
int	intValue()
Fraction	inverse() Swap the values: 1/2 => 2/1
long	longValue()
Fraction	mul(Fraction an)
Fraction	multiply(Fraction other)
Fraction	neg()
Fraction	negate() current value * -1
Fraction	not() This method returns a negative value if and only if this number is non-negative.
Fraction	pow(int an)
Fraction	power(int exponent)
int	sgn() positive value
Fraction	shallowClone()
Fraction	sub(Fraction an)
Fraction	substract(Fraction other)
java.lang.String	toString() Return this value as a decimal string notation (e.g.
static Fraction	valueOf(java.math.BigDecimal value)
static Fraction	valueOf(java.math.BigInteger value)
static Fraction	valueOf(java.lang.Double value)
static Fraction	valueOf(java.lang.Float value)
static Fraction	valueOf(java.lang.Integer value)
static Fraction	valueOf(java.lang.Long value)
static Fraction	valueOf(java.lang.Short value)
static Fraction	valueOf(java.lang.String value)

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ZERO

public static final Fraction ZERO

ONE

public static final Fraction ONE

Constructor Detail

Fraction

public Fraction()

Default is zero

Fraction

public Fraction(int value)

Fraction

public Fraction(long value)

Fraction

public Fraction(java.math.BigDecimal value)

Fraction

public Fraction(java.math.BigInteger value)

Fraction

public Fraction(double value)

Fraction

public Fraction(float value)

Fraction

public Fraction(java.lang.String value)

Fraction

public Fraction(int value,
                int divider)

Fraction

public Fraction(java.math.BigInteger bi1,
                java.math.BigInteger bi2)

Fraction

public Fraction(Fraction f)

Method Detail

getValue

public java.math.BigInteger getValue()

getNumerator

public java.math.BigInteger getNumerator()

getDivider

public java.math.BigInteger getDivider()

getDenominator

public java.math.BigInteger getDenominator()

add

public Fraction add(Fraction other)

substract

public Fraction substract(Fraction other)

sub

public Fraction sub(Fraction an)

multiply

public Fraction multiply(Fraction other)

mul

public Fraction mul(Fraction an)

divide

public Fraction divide(Fraction other)

div

public Fraction div(Fraction an)

power

public Fraction power(int exponent)

pow

public Fraction pow(int an)

abs

public Fraction abs()

positive value

sgn

public int sgn()

positive value

negate

public Fraction negate()

current value * -1

neg

public Fraction neg()

integer

public Fraction integer()

Lose the fraction bit

fraction

public Fraction fraction()

Get only the fraction bit

not

public Fraction not()

This method returns a negative value if and only if this number is non-negative.

inverse

public Fraction inverse()

Swap the values: 1/2 => 2/1

fractionalize

public void fractionalize(int precision)

TODO: Find the nearest fraction e.g. 0.333333333433443 = 1/3

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object

shallowClone

public Fraction shallowClone()

equals

public boolean equals(java.lang.Object an)

Overrides:

equals in class java.lang.Object

compareTo

public int compareTo(java.lang.Object o)

Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object

Specified by:

compareTo in interface java.lang.Comparable

toString

public java.lang.String toString()

Return this value as a decimal string notation (e.g. 1.333333333333333333333333333333333333333333333333333333...) This method uses the bigDecimalValue() method to generate the decimal (and thus uses the default scale and rounding) and then strips any postfixing zero's so 1/2 becomes 0.5 instead of 0.50000000... toString returns decimal notation because all number classes do this. Use asString to get the correct (unrounded value).

Overrides:

toString in class java.lang.Object

asStringRaw

public java.lang.String asStringRaw()

Return as fraction string notation, e.g. 1/3 (no simplify)

asString

public java.lang.String asString()

Simplify and return as fraction string notation, e.g. 1/3

asString2

public java.lang.String asString2()

Simplify and return as integer+(fraction) string notation, e.g 1+(2/3)

bigDecimalValue

public java.math.BigDecimal bigDecimalValue(int scale,
                                            int rounding)

Return a big decimal with the specified scale (if the conversion requires a divide)

bigDecimalValue

public java.math.BigDecimal bigDecimalValue()

Return a BigDecimal with scale 10 and rounding half up

doubleValue

public double doubleValue()

Specified by:

doubleValue in class java.lang.Number

floatValue

public float floatValue()

Specified by:

floatValue in class java.lang.Number

intValue

public int intValue()

Specified by:

intValue in class java.lang.Number

longValue

public long longValue()

Specified by:

longValue in class java.lang.Number

valueOf

public static Fraction valueOf(java.lang.String value)

valueOf

public static Fraction valueOf(java.math.BigDecimal value)

valueOf

public static Fraction valueOf(java.math.BigInteger value)

valueOf

public static Fraction valueOf(java.lang.Short value)

valueOf

public static Fraction valueOf(java.lang.Integer value)

valueOf

public static Fraction valueOf(java.lang.Long value)

valueOf

public static Fraction valueOf(java.lang.Double value)

valueOf

public static Fraction valueOf(java.lang.Float value)