Quadratic equation

import java.text.DecimalFormat;
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double a = Double.parseDouble(scanner.nextLine());
        double b = Double.parseDouble(scanner.nextLine());;
        double c = Double.parseDouble(scanner.nextLine());;
        double x1, x2;
        double det = (b * b) - (4.0 * a * c);
        double sqrt = Math.sqrt(det);
        DecimalFormat pattern = new DecimalFormat("0.0");
        if(det > 0){
            x1 = (-b - sqrt) / (2*a);
            x2 = -(b - sqrt) / (2*a);
            System.out.print("x1=" +pattern.format((x1))+";"+" ");
            System.out.println("x2=" + pattern.format((x2)));
        }
        else if(det == 0){
            x1=x2=-b / (2*a);
            System.out.print("x1=" + pattern.format((x1))+";"+" ");
            System.out.println("x2=" + pattern.format((x2)));
        }
    }
}