Question

please answer in java and make possible to copy and paste. thank you!!!!!

Re-implement the Rational class ****JAVA****

Extend the Number class and implement the Comparable interface to introduce new functionality to your Rational class. The class definition should look like this:

public class Rational extends Number implements Comparable<Rational> {

    // code goes here
}

In addition a new private method gcd should be defined to ensure that the number is always represented in the lowest terms.

Here is the Main class that will use to test your Rational classes.

public class Main {

    public static void main(String[] args) {

        Rational a = new Rational(2, 4);
        Rational b = new Rational(2, 6);

        System.out.println(a + " + " + b + " = " + a.add(b));
        System.out.println(a + " - " + b + " = " + a.sub(b));
        System.out.println(a + " * " + b + " = " + a.mul(b));
        System.out.println(a + " / " + b + " = " + a.div(b));

        Rational[] arr = {new Rational(7, 1), new Rational(6, 1),
                          new Rational(5, 1), new Rational(4, 1),
                          new Rational(3, 1), new Rational(2, 1),
                          new Rational(1, 1), new Rational(1, 2),
                          new Rational(1, 3), new Rational(1, 4),
                          new Rational(1, 5), new Rational(1, 6),
                          new Rational(1, 7), new Rational(1, 8),
                          new Rational(1, 9), new Rational(0, 1)};

        selectSort(arr);

        for (Rational r : arr) {
            System.out.println(r);
        }

        Number n = new Rational(3, 2);

        System.out.println(n.doubleValue());
        System.out.println(n.floatValue());
        System.out.println(n.intValue());
        System.out.println(n.longValue());
    }

    public static > void selectSort(T[] array) {

        T temp;
        int mini;

        for (int i = 0; i < array.length - 1; ++i) {

            mini = i;

            for (int j = i + 1; j < array.length; ++j) {
                    if (array[j].compareTo(array[mini]) < 0) {
                        mini = j;
                    }
            }

            if (i != mini) {
                    temp = array[i];
                    array[i] = array[mini];
                    array[mini] = temp;
            }
        }
    }
}

Answer 1

public class Rational extends Number implements Comparable<Rational> {

    private int numerator;
    private int denominator;

    public Rational() {
        numerator = 0;
        denominator = 1;
    }

    public Rational(int numerator, int denominator) {
        this.numerator = numerator;
        this.denominator = denominator;
    }

    @Override
    public int intValue() {
        return (int) doubleValue();
    }

    @Override
    public long longValue() {
        return (long) doubleValue();
    }

    @Override
    public float floatValue() {
        return (float) doubleValue();
    }

    @Override
    public double doubleValue() {
        return numerator / (double) denominator;
    }

    public Rational add(Rational rhs) {
        return new Rational(numerator * rhs.denominator + rhs.numerator * denominator, denominator * rhs.denominator);
    }

    public Rational sub(Rational rhs) {
        return new Rational(numerator * rhs.denominator - rhs.numerator * denominator, denominator * rhs.denominator);
    }

    public Rational mul(Rational rhs) {
        return new Rational(numerator * rhs.numerator, denominator * rhs.denominator);
    }

    public Rational div(Rational rhs) {
        return new Rational(numerator * rhs.denominator, rhs.numerator * denominator);
    }

    @Override
    public int compareTo(Rational o) {
        return Double.compare(numerator /(double) denominator, o.numerator /(double)o.denominator);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Rational rational = (Rational) o;
        return compareTo(rational) == 0;
    }

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