用java解一元二次方程

package net.xmh.lesson3;
public class Fc{
int a,b,c;
double gen()
{double i;
double j=1.0;
double k=1.0;
i=bb-4ac;
if(i>=0)
j=((-b)+Math.sqrt(i))/2a;
k=((-b)-Math.sqrt(i))/2*a;
return(j);
}

public static void main(String[] args) {
    Fc s=new Fc();
    s.a=1;
    s.b=5;
    s.c=6;


    System.out.println("j");
    System.out.println("k");

}

}

public class homework2 {
}