Class Answer

java.lang.Object
  Answer

All Implemented Interfaces:

java.lang.Comparable<Answer>

public class Answer
extends java.lang.Object
implements java.lang.Comparable<Answer>

This class presents fractions of form n/d where n and d are integer numbers. Basic operations and arithmetics for fractions are provided.

Author:

Jaanus Poial

Constructor Summary

Answer(int a, int b)
Constructor.

Method Summary

java.lang.Object	clone() Clone of the fraction.
int	compareTo(Answer m) Comparision of fractions.
Answer	divideBy(Answer m) Quotient of fractions.
boolean	equals(java.lang.Object m) Equality test.
Answer	fractionPart() Extract fraction part of the (improper) fraction (a proper fraction without the integer part).
int	getDenominator() Public method to access the denominator field.
int	getNumerator() Public method to access the numerator field.
int	integerPart() Integer part of the (improper) fraction.
Answer	inverse() Inverse of the fraction. n/d becomes d/n.
Answer	minus(Answer m) Difference of fractions.
Answer	opposite() Opposite of the fraction. n/d becomes -n/d.
Answer	plus(Answer m) Sum of fractions.
Answer	times(Answer m) Multiplication of fractions.
static Answer	toAnswer(double f, int d) Double value f presented as a fraction with denominator d > 0.
double	toDouble() Approximate value of the fraction.
java.lang.String	toString() Conversion to string.
static Answer	valueOf(java.lang.String s) Conversion from string to the fraction.

Methods inherited from class java.lang.Object

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

Constructor Detail

Answer

public Answer(int a,
              int b)

Constructor.

Parameters:

a - numerator

b - denominator > 0

Method Detail

getNumerator

public int getNumerator()

Public method to access the numerator field.

Returns:

numerator

getDenominator

public int getDenominator()

Public method to access the denominator field.

Returns:

denominator

toString

public java.lang.String toString()

Conversion to string.

Overrides:

toString in class java.lang.Object

Returns:

string representation of the fraction

equals

public boolean equals(java.lang.Object m)

Equality test.

Overrides:

equals in class java.lang.Object

Parameters:

m - second fraction

Returns:

true if fractions this and m are equal

plus

public Answer plus(Answer m)

Sum of fractions.

Parameters:

m - second addend

Returns:

this+m

times

public Answer times(Answer m)

Multiplication of fractions.

Parameters:

m - second factor

Returns:

this*m

inverse

public Answer inverse()

Inverse of the fraction. n/d becomes d/n.

Returns:

inverse of this fraction: 1/this

opposite

public Answer opposite()

Opposite of the fraction. n/d becomes -n/d.

Returns:

opposite of this fraction: -this

minus

public Answer minus(Answer m)

Difference of fractions.

Parameters:

m - subtrahend

Returns:

this-m

divideBy

public Answer divideBy(Answer m)

Quotient of fractions.

Parameters:

m - divisor

Returns:

this/m

compareTo

public int compareTo(Answer m)

Comparision of fractions.

Specified by:

compareTo in interface java.lang.Comparable<Answer>

Parameters:

m - second fraction

Returns:

-1 if this < m; 0 if this==m; 1 if this > m

clone

public java.lang.Object clone()

Clone of the fraction.

Overrides:

clone in class java.lang.Object

Returns:

new fraction equal to this

integerPart

public int integerPart()

Integer part of the (improper) fraction.

Returns:

integer part of this fraction

fractionPart

public Answer fractionPart()

Extract fraction part of the (improper) fraction (a proper fraction without the integer part).

Returns:

fraction part of this fraction

toDouble

public double toDouble()

Approximate value of the fraction.

Returns:

numeric value of this fraction

toAnswer

public static Answer toAnswer(double f,
                              int d)

Double value f presented as a fraction with denominator d > 0.

Parameters:

f - real number

d - positive denominator for the result

Returns:

f as an approximate fraction of form n/d

valueOf

public static Answer valueOf(java.lang.String s)

Conversion from string to the fraction. Accepts strings of form that is defined by the toString method.

Parameters:

s - string form (as produced by toString) of the fraction

Returns:

fraction represented by s