I need help solving this problem!!

Hi, i'm new to java and have written only a few programs, i recently wrote one and had the following error but dont know why...........
Exception in thread "main" java.lang.NoClassDefFoundError: quadraticsolverApp
I have included my code below.....
import java.applet.Applet;
public class quadraticsolver extends Applet
public double a, b, c ;
public void init()
a=0;
b=0;
c=0;
public String getRoot1()
if (getDescriminent() < 0.0 || this.a == 0.0)
return "" + ((-b + Math.sqrt(-getDescriminent()))/(2 * a)) + " i";
else
return "" + ((-b + Math.sqrt(getDescriminent()))/(2 * a));
public String getRoot2()
if (getDescriminent() < 0.0 || a == 0.0)
return "" + ((-b - Math.sqrt(-getDescriminent()))/(2 * a)) + " i";
else
return "" + ((-b - Math.sqrt(getDescriminent()))/(2 * a));
public double getDescriminent()
return (b*b - 4 * a * c);
public void setA(double bValue)
a = bValue;
public void setB(double bValue)
b = bValue;
public void setC(double bValue)
c = bValue;
Thanks for the help
Noel
email: [email protected]

Besides that, the code is broken. For instance
return "" + ((-b - Math.sqrt(-getDescriminent()))/(2 * a)) + " i";should be
return "" + (-b/(2*a)) + " " + (-Math.sqrt(-getDescriminent())/(2 * a)) + " i";
to get correct answers... 1/2 * (-1-sqrt(3)) i (or approximately -1.36602540 i) is not a solution of x^2 + x + 1 = 0. Also, if a is small, it's better to use the formula x = 2*c / (-b +/- sqrt(b^2 - 4ac))

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