I wrote a code to solve a quadratic equation in Java, but it doesn't work [closed]

import java.util.*;public class Project1 {    public static void main(String[] args) {        System.out.println("Enter a,b,c: ");        Scanner input = new Scanner(System.in);        double a1 = input.nextDouble();        double b1 = input.nextDouble();        double c1 = input.nextDouble();        Equsolve Equ = new Equsolve(a1, b1, c1);        Equ.PrintInfo();    }}

This was main class code.

this one is equation class:

public class Equsolve {    double a;    double b;    double c;    double x2;    double x1;    public Equsolve(double a1, double b1, double c1) {        a = a1;        b = b1;        c = c1;    }    public void delta() {        double delta = (b*b)-(4*a*c);    }    public void x1(double delta){        x1 = ((-b)+(Math.sqrt(delta))/(2*a));    }    public void x2(double delta){        x2 = ((-b)-(Math.sqrt(delta))/(2*a));    }    public void PrintInfo(){        System.out.format("a = %f\n", a);        System.out.format("b = %f\n", b);        System.out.format("c = %f\n", c);        System.out.format("x1 = %f\n", x1);        System.out.format("x2 = %f\n", x2);    }}

I was trying to create a class which solves quadratic equations.But the x1 and x2 are always 0!I even tried to change the value manually but it's still 0!