Affichage d'un double sous forme fractionnaire

import java.math.BigInteger;

public class Fraction extends Number {

    private final BigInteger numerator;
    private final BigInteger denominator;

    public Fraction(long numerator, long denominator) {
        this.numerator = BigInteger.valueOf(numerator);
        this.denominator = BigInteger.valueOf(denominator);
    }

    @Override
    public String toString() {
        return numerator + "/" + denominator;
    }
}