package chapter6; public class Rectangle { private double length; private double width; public Rectangle(){ length = 0; width = 0; } public Rectangle(double length, double width){ this.length = length; //can be set this way setWidth(width); //or can be set this way. these are only different here to demo alternative options } public double getLength(){ return length; } public void setLength(double length){ this.length = length; } public double getWidth(){ return width; } public void setWidth(double width){ this.width = width; } public double calculatePerimeter(){ return (2 * length) + (2 * width); } public double calculateArea(){ return length * width; } }