Создать классы для решения уравнений

public abstract class Root {
    public abstract void calculate();
    public abstract void print();
}

public class Linear extends Root {
    private double k;
    private double b;
    private double value;
 
    public Linear(double k, double b) {
        this.k = k;
        this.b = b;
    }
 
    @Override
    public void calculate() {
        value = -b / k;
    }
 
    @Override
    public void print() {
        System.out.println("y = kx + b <=> 0 = " + k + "x + " + b + " <=> x = -" + k + "/" + b + " <=> x = " + value);
    }
}

public class Quadratic extends Root {
    private static final double EPSILON = 0.000000000001;
 
    private double a;
    private double b;
    private double c;
    private double d;
    private ArrayList<Double> values;
 
    public Quadratic(double a, double b, double c) {
        this.a = a;
        this.b = b;
        this.c = c;
        values = new ArrayList<>();
    }
 
    @Override
    public void calculate() throws ArithmeticException {
        d = b * b - 4 * a * c;
 
        if (Double.doubleToLongBits(d) < 0)
            throw new ArithmeticException("Discriminant is less than zero.");
 
        values.add(new Double((-b + Math.sqrt(d)) / (2.0 * a)));
 
        if (Math.abs(d) > EPSILON)
            values.add(new Double((-b - Math.sqrt(d)) / (2.0 * a)));
    }
 
    @Override
    public void print() {
        String roots;
        if (values.size() == 2)
            roots = "x[1] = " + values.get(0) + ", x[2] = " + values.get(1);
        else
            roots = "x = " + values.get(0);
 
        System.out.println("y = ax^2 + bx + c <=> 0 = " + a + "x^2 + " + b + "x + " + c +
                " <=> d = " + d + " <=> " + roots);
    }
}

public class Main {
 
    public static void main(String[] args) {
        testLinear();
        testQuadratic();
    }
 
    private static void testLinear() {
        Linear equation = new Linear(-3.4, 2.77);
        equation.calculate();
        equation.print();
    }
 
    private static void testQuadratic() {
        Quadratic q = new Quadratic(1.0, -3.0, -4.0);
 
        try {
            q.calculate();
            q.print();
        } catch (ArithmeticException e) {
            System.out.println(e);
        }
    }
}