如何在java中求解虚二次根？

import org.apache.commons.math3.complex.Complex;

public class ComplexRootSolver {
    public static void main(String[] args) {
        double a = 1.0;
        double b = 2.0;
        double c = 3.0;

        double discriminant = b * b - 4 * a * c;

        if (discriminant < 0) {
            double realPart = -b / (2 * a);
            double imaginaryPart = Math.sqrt(-discriminant) / (2 * a);

            Complex root1 = new Complex(realPart, imaginaryPart);
            Complex root2 = new Complex(realPart, -imaginaryPart);

            System.out.println("虚二次根1: " + root1);
            System.out.println("虚二次根2: " + root2);
        } else if (discriminant == 0) {
            double root = -b / (2 * a);
            System.out.println("实二次根: " + root);
        } else {
            System.out.println("该二次方程没有实数根或虚数根。");
        }
    }
}