Class Fraction

java.lang.Object

Fraction

public class Fraction
extends java.lang.Object

Fraction is an object representing the ratio of two numbers: a "numerator" on top and a "denominator" on bottom. Objects like this can be useful when you need to work with exact quantities, without the rounding errors inherent in doubles.

Constructor Summary

Constructors

Constructor and Description
Fraction(int numerator, int denominator) Create a new Fraction, from its numerator and denominator.

Method Summary

Methods

Modifier and Type	Method and Description
Fraction	add(Fraction other) Add a second Fraction to this.
Fraction	divide(Fraction other) Divide this by a second Fraction.
boolean	equals(Fraction other) Build a true if this is equivalent to other; otherwise false.
int	getDenominator() Accessor for the denominator.
int	getNumerator() Accessor for the numerator.
Fraction	multiply(Fraction other) Multiply a second Fraction by this.
void	setDenominator(int newDenominator) Mutator for the denominator.
void	setNumerator(int newNumerator) Mutator for the numerator.
Fraction	subtract(Fraction other) Subtract a second Fraction from this.
double	toDouble() Calculate the double whose value best approximates this's value.
java.lang.String	toString() Build a String representing this Fraction, as (numerator/denominator).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Fraction

public Fraction(int numerator,
        int denominator)

Create a new Fraction, from its numerator and denominator.

Since:

1.0

Method Detail

add

public Fraction add(Fraction other)

Add a second Fraction to this.

Parameters:

other - the other Fraction to add

Returns:

the resulting Fraction

Since:

1.0

subtract

public Fraction subtract(Fraction other)

Subtract a second Fraction from this.

Parameters:

other - the other Fraction to subtract

Returns:

the resulting Fraction

Since:

1.0

multiply

public Fraction multiply(Fraction other)

Multiply a second Fraction by this.

Parameters:

other - the other Fraction to multiply

Returns:

the resulting Fraction

Since:

1.0

divide

public Fraction divide(Fraction other)

Divide this by a second Fraction.

Parameters:

other - the other Fraction by which to divide

Returns:

the resulting Fraction

Since:

1.0

toDouble

public double toDouble()

Calculate the double whose value best approximates this's value.

Returns:

the approximate value

Since:

1.0

toString

public java.lang.String toString()

Build a String representing this Fraction, as (numerator/denominator).

Overrides:

toString in class java.lang.Object

Returns:

the String (numerator/denominator)

Since:

1.0

equals

public boolean equals(Fraction other)

Build a true if this is equivalent to other; otherwise false.

Parameters:

other - the other Fraction

Returns:

the whether they are equivalent

Since:

1.0

getNumerator

public int getNumerator()

Accessor for the numerator.

Returns:

the numerator

Since:

1.0

getDenominator

public int getDenominator()

Accessor for the denominator.

Returns:

the denominator

Since:

1.0

setNumerator

public void setNumerator(int newNumerator)

Mutator for the numerator.

Parameters:

newNumerator - the new numerator

Since:

1.0

setDenominator

public void setDenominator(int newDenominator)

Mutator for the denominator.

Parameters:

newDenominator - the new denominator

Since:

1.0