Hello yet again =)

I am required to create a program that consists of two classes. The driver class calls on the other class to set/get radius and height variables and calculate the volume of a cylinder. The problem I am having is that; I create two objects with two different radius/height variables, but the program returns the same number for Volume each time. Im confused because radius and hieght all return properly. I tried debugging the program and it seems to set pi as 3.0 (We were told to define Pi as 22/7). Can someone help me please? Here are the codes for both classes.

Driver Class

/**
 * Driver Class
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
import javax.swing.*;
public class siloTest
{
    public static void main (String[]args)
    {
        silo c1 = new silo();
        silo c2 = new silo();
        
        String pRadius1 = JOptionPane.showInputDialog(null, "Enter radius of Silo: 1");
        double iRadius = Double.parseDouble(pRadius1);
        String pHeight1 = JOptionPane.showInputDialog(null, "Enter the height of Silo: 1");
        double iHeight = Double.parseDouble(pHeight1);
        
        c1.setRadius(iRadius);
        c1.setHeight(iHeight);
        
        String pRadius2 = JOptionPane.showInputDialog(null, "Enter radius of Silo: 2");
        iRadius = Double.parseDouble(pRadius2);
        String pHeight2 = JOptionPane.showInputDialog(null, "Enter the height of Silo: 2");
        iHeight = Double.parseDouble(pHeight2);
        
        c2.setRadius(iRadius);
        c2.setHeight(iHeight);
        
        JOptionPane.showMessageDialog (null, "Silo 1 Dimensions\nRadius = " + 
        c1.getRadius() + "\nHeight = " + c1.getHeight() + "\nVolume = " +c1.calcVolume(iRadius, iHeight));
        
        JOptionPane.showMessageDialog (null, "Silo 2 Dimensions\nRadius = " + 
        c2.getRadius() + "\nHeight = " + c2.getHeight() + "\nVolume = " +c2.calcVolume(iRadius, iHeight));
        
        
    }
}

Other Class

/**
 * Class to perform calculations etc
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
import java.text.DecimalFormat;
public class silo
{
    private double radius;
    private double height;

    public silo()
     {
          radius = 0;
          height = 0;
     }    
    
    public void setRadius(double iRadius)
    {
        radius = iRadius;
    }
 
    public String getRadius()
    {
        DecimalFormat fmt = new DecimalFormat (",###.00");
        String fRadius = fmt.format(radius);
        return fRadius;
    }
    public void setHeight(double iHeight)
    {
        height = iHeight;
    }
    public String getHeight()
    {
        DecimalFormat fmt = new DecimalFormat (",###.00");
        String fHeight = fmt.format(height);
        return fHeight;
    }
    
    public double calcVolume(double radius, double height)
    {
        
        double pi = 22/7;
        double volume = pi*(Math.pow(radius,2))*height;
        return volume;
    }
    
}

1. 22/7 is a calculation using 2 integers, so it's performed in int arithmetic, giving the int result 3, which is then assigned to the long variable. Just making one of the values a floating poit number will force the calc into floating point, eg 22.0/7
2. When you calc the volume you pass in a radius & height, which are the same both times. The volume method should not need any parameters, it should use the values it already has.

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