need help with calling method

[pocix]

question: The program should prompt the user to enter data for the width and height of the 2 rectangles and use the setWidth() and setLength() methods to store this data in the instance variables.

driver

import javax.swing.*;
public class Room
{
	public static void main(String[ ] args)
	{
	      double sq;
             String input;
             String input2;
             double length;
             double width;
             
              input = JOptionPane.showInputDialog("Enter the length");
             length = Double.parseDouble(input);
             
             input2 = JOptionPane.showInputDialog("Enter the width");
             width = Double.parseDouble(input2);
                 
             sq = Arearect.getArea();

             JOptionPane.showMessageDialog(null,"The area is " + Arearect.getArea());
}
}

instantiable

public class Arearect
{
        public void setWidth(double width)
        {
             width = width;
        }
        
         public void setLength(double length)
         {
         length = length;
        }
        
        public static double getArea()
        {
         double area;
		area=length * width;  //<< problem here

               return area;
            }
}

how to call the area and display it to driver?
or my code all mess up?

[musthafa.aj]

you didn't set value for AreaRect...that is the problem...

you van do like this if this simple program...

import javax.swing.*;
public class Room
{
	public static void main(String[ ] args)
	{
	      double sq;
             String input;
             String input2;
             double length;
             double width;
             
              input = JOptionPane.showInputDialog("Enter the length");
             length = Double.parseDouble(input);
             
             input2 = JOptionPane.showInputDialog("Enter the width");
             width = Double.parseDouble(input2);
                 
             sq =getArea(length ,width ) ;//Arearect.getArea();

             JOptionPane.showMessageDialog(null,"The area is " + //Arearect.getArea());
}




public static double getArea(int length ,int width )

{

double area;

area=length * width; //<< problem here

 

return area;

}

else

else

import javax.swing.*;
public class Room
{
	public static void main(String[ ] args)
	{
	      double sq;
             String input;
             String input2;
             double length;
             double width;
             Arearect areaRect=new Arearect();
              input = JOptionPane.showInputDialog("Enter the length");
             length = Double.parseDouble(input);
             areaRect.setlength (length );
             input2 = JOptionPane.showInputDialog("Enter the width");
             width = Double.parseDouble(input2);
                 areaRect.setwidth  (width  );
             sq =areaRect.getArea();

             JOptionPane.showMessageDialog(null,"The area is " + sq );
}


}

[pocix]

i understand it now :$
thanks ;)