Cannot Resolve Symbol

[alexpalmbay]

I'm new to JAVA, so please handle w/care

I'm trying to write a simple rectangle pgm, but I'm getting the following errors:

Rectangle.java:24: cannot resolve symbol
symbol : variable calculateArea
location: class Rectangle
Sytem.out.println(Rectangle.calculateArea);

Below is my pgm:

/*
* File: Rectangle.java
* Description: This program represents a geometric rectangle.
*/

public class Rectangle
{
private double length = 3; // Instance variables
private double width = 4;

public Rectangle(double l, double w) // Constructor method
{
length = l;
width = w;
}
public double calculateArea() // Access method
{
return length * width; // calculateArea()
}

public static void main(String argv[])
{
System.out.println(Rectangle.calculateArea);
}
}//end of pgm

I'm using jdk1.3.1_04, which I download off the SUN/JAVA website. As I said, I'm new to JAVA, so I'm sure the answer is very simple.

Thank you very much for your help!

 

[wushutwist]

You are missing some parens and you need to create an instance of your object before you can use its instance methods. Remember, main() is a static method (belongs to the class as a whole) and cannot directly can an instance method without first creating an instance of the object. Your main() should look something like:

public static void main(String[] args) {
  Rectangle r = new Rectangle(2,3);
  System.out.println(r.calculateArea());
}

 

[alexpalmbay]

Thank you very much for your assistance. It works now!