public class TesterClass

$\{$

public static void main$($String$[]$ args$)$

$\{$

Fraction f$1=$ new Fraction$()$;

Fraction f$2=$ new Fraction$(1,2)$;

System.out.println$($f$1)$;

System.out.println$($f$2.$numerator $/$ f$2.$denominator$)$;

$\}$

$\}$

$/**$ Class Fraction $*/$

class Fraction

$\{$

$//$ instance variables

private int numerator;

private int denominator;

$//$ constructor: set instance variables to default values

public Fraction$()$

$\{$

int d $=1$;

numerator $=$ d;

denominator $=$ d;

$\}$

$//$ constructor: set instance variables to init parameters

public Fraction$($int initNumerator, int initDenominator$)$

$\{$

numerator $=$ initNumerator;

denominator $=$ initDenominator;

$\}$

public String toString$()$

$\{$

$//$ if the denominator is $1,$ then just return the numerator

if $($denominator $==$ d$)$

$\{$

int newNumerator $=1$;

$\}$

return newNumerator $+"/"+$ denominator;

$\}$

$\}$