Constructor problems. New to java

[Jaybond63]

public class Sphere {

private double diameter;

double r;
double sr;
double vr;

public Sphere(){
this.diameter = 0;}

public void setDiameter(double d){
this.diameter = d;}

public double getDiameter(){
return diameter;}


public double getVolume(){
r = ( diameter / 2 );
vr = ( r * r * r );
double v = ( 4 / 3 ) * (Math.PI * vr);
return v;}

public double getSurface(){
r = ( diameter / 2);
sr = ( r * r );
double sa = ( 4 ) * (Math.PI * sr);
return sa;
}

public String toString(){
String result = ("The Sphere that has a: " + " " + diameter + "diameter" + " , has " + volume + " volume , and " + surface + " surface area");
return result;
}

}

and this is my Driver

public class MultiSphere{

public static void main(String[] args){

Sphere sphere1 = new Sphere();

Sphere sphere2 = new Sphere();

sphere1.setDiameter(55);

sphere2.setDiameter(88);

sphere1.getSurface();

sphere1.getVolume();

sphere2.getSurface();

sphere2.getVolume();


System.out.println(sphere1);
System.out.println(sphere2);




}
}

My Problem is that I am not able to display this message

String result = ("The Sphere that has a: " + " " + diameter + "diameter" + " , has " + volume + " volume , and " + surface + " surface area");

Without getting an error that it cannot find the symbol.

[Norm]

an error that it cannot find the symbol.

Please post the full text of the error message.

[DarrylBurke]

Code Conventions for the Java Programming Language: Contents -- particularly the section on proper indenting.

db

[Jaybond63]

Please post the full text of the error message.

C:\Users\user\Desktop\Java Files\Sphere.java:33: error: cannot find symbol
String result = ("The Sphere that has a: " + " " + diameter + "diameter" + " , has " + volume + " volume , and " + surface + " surface area");
^
symbol: variable volume
location: class Sphere
C:\Users\user\Desktop\Java Files\Sphere.java:33: error: cannot find symbol
String result = ("The Sphere that has a: " + " " + diameter + "diameter" + " , has " + volume + " volume , and " + surface + " surface area");
^
symbol: variable surface
location: class Sphere
2 errors

Tool completed with exit code 1

[Tolls]

Where have you defined either of those variables?

[Akirien]

The error stated everything.. Like Tolls said, where have you defined those variables? Surface and Volume.