Problem With An Else Statement - Probably Doing Something Simple Wrongly

At line 22, the compiler is saying that there is an else statement without an if? How come? The if is there.

Its a program designed to calculate the area of a circle, rectangle or triangle depending on the user's needs.

I've only gone as far a circle as I feel if I get circle done then the others shouldn't be a huge problem as they should (HOPEFULLY) be a case of repetition. Sorry for all the comments in the code, that's howe have to present our work.

Code:

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// Program to read in a shape from a user, using JOptionPane, then ask for measurement again using
//JOptionPane then calculate the area

import javax.swing.JOptionPane; //import JOptionPane
public class CircleRectangleTriangle //create class name
{ //open class
        public static void main (String[] args) //create args
                { //open args
                        int higher, lower; //declare ints
                        String circle=circle; //String with value circle
                        String rectangle=rectangle; //String with value rectangle
                        String triangle=triangle; //String with value triangle
                        String shape=JOptionPane.showInputDialog(null, "Do you want to calculate the area of a circle, rectangle or triangle?:"); //receive shape type
                                if (shape.equals(circle)) //if shape string equals circle string
                                { //open if
                                String userinput=JOptionPane.showInputDialog(null, "Enter the value of the radius:"); //receive radius value
                                radius=Double.parseDouble(userinput); //Parses userinput string to a double
                                        if (radius < 0); //If radius value is lower than 0
                                        { //open if
                                        JOptionPane.showMessageDialog(null, "Radius value less than 0: cannot compute circle area"); //Inform user of error
                                        } //close if
                                        else //else
                                        { //open else
                                        area = radius*radius*3.1416; //calculate size of area
                                        JOptionPane.showMessageDialog(null, "A circle of radius " + radius + " has an area of " + area + "."); //Inform user of size of area
                                        } //close else
                                } //close if
                        System.exit(0); //program terminates safely
                } //close args
} //close class

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You if statement ends in a semicolon.

if(whatever); //nothing happens
{
///always executes
}
else{
///else without if
}

Great, thanks! Still get confused over syntax.

When in doubt, consult the tutorials: The if-then and if-then-else Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)