45 Interface shape and implemented areas of figures

import java.io.*;
interface shape{
    int length=3,breadth=6,side = 6;
    void AreaOfSqure();
    void AreaOfRectangle();
}
class Main implements shape{
    public void AreaOfSqure(){
      System.out.println("Area of Square is " +side*side);
    }
    public void AreaOfRectangle(){
      System.out.println("Area of Rectangle is " + length*breadth);
    }
    public static void main (String args[]){
        Main obj = new Main();
        obj.AreaOfRectangle();
        obj.AreaOfSqure();
    }
}
/*
Area of Rectangle is 18
Area of Square is 36
*/