I am having a method issue. Any help would be appreciated:)

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Java

I came up with 4 classes and several fields, constructors, and methods.

Classes: public class CalculateRectangle, public static class Perimeter extends CalculateRectangle, public static class Area extends CalculateRectangle, public static class Volume extends CalculateRectangle

Fields : private static int length; private static int width; private static int height; private static int p; private static int a; private static int v; private int perimeter; static int p = 0; private int area; static int a = 0; private int volume; static int v = 0;

Constructors: public CalculateRectangle (){ length = 0; width = 0; height = 0; }, public Perimeter () { super(); } public Area () { super(); }public Volume () { super(); }

But I'm having some trouble getting methods to call variables. Would any one tell me what I could do to make it work and still maintain inheritance form?

*/
package calculaterectangle;

/**
 *
 * @author Janie
 */
import java.util.Scanner;

public class CalculateRectangle {

    //class fields
    private static int length;
    private static int width;
    private static int height;
    private static int p;
    private static int a;
    private static int v;
    
    //constructor
    public CalculateRectangle (){
        length = 0;
        width = 0;
        height = 0;               
    }
            
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String choice = "y";
        while (choice.equalsIgnoreCase("y")) {
        System.out.print("Enter length of rectangle         : ");
        String length = sc.next();
        System.out.print("Enter width of rectangle          : ");
        String width = sc.next();
        System.out.print("Enter height of rectangular prism : ");
        String height = sc.next();
       //method
       p = Perimeter.perimeter.setPerimeter(perimeter);
       a = Area.area.setArea(area);
       v = Volume.volume.setVolume(volume);
       
    System.out.println("perimeter:   " + p + "\n");
    System.out.println("Base Area:   " + a + "\n");
    System.out.println("Volume   :   " + v + "\n");
    
    System.out.print("Continue? (y/n): ");
    choice = sc.nextLine();
    System.out.println();
    }}
      public static class Perimeter extends CalculateRectangle {
         //class fields
         private int perimeter; 
         static int p = 0;
         //constructor
         public Perimeter () {
         super();
         }       
        public class perimeter extends Perimeter {
           //constructor
            public perimeter () {
             super(); }
            //method
           public void setPerimeter(){   
            perimeter = 2 * (length + width);
            p = perimeter;
            }
        }
     }
    
    public static class Area extends CalculateRectangle {
        //class fields
        private int area; 
        static int a = 0;
        //constructor
        public Area () {
        super(); }
        public class area extends Area {
             //constructor 
            public area () {
                super();}
            //method
            public void setArea() {
                area = length * width;
                a = area;
            }
            }
        
        }
  
    public static class Volume extends CalculateRectangle {
        //class fields
        private int volume; 
        static int v = 0;  
        //constructor
        public Volume () {
        super();   }
        public class volume extends Volume {
               //constructor 
              public volume() {
                  super();}
              //method
              public void setVolume() {
                  volume = length * width * height;
                  v = volume;
              }
              }  
        }
       
        
    }