OOP Class Assignment 01

Main.java

package com.company;

import java.util.Scanner;

class Rectangle {

    private double length;
    private double width;
    private boolean error;

    public Rectangle() {
        this.length = 1;
        this.width = 1;
    }

    public double getLength() {
        return length;
    }

    public double getWidth() {
        return width;
    }

    public boolean isError()
    {
        return this.error;
    }

    public Rectangle setLength(double length) {
        this.error = false;
        if(length >= 0 && length < 20 && length == (double) length) {
            this.length = length;
        } else {
            this.error = true;
            System.out.println("Please enter between 0 to 20, and should be float");
        }
        return this;
    }

    public Rectangle setWidth(double width) {
        this.error = false;
        if(width >= 0 && width < 20 && width == (double) width) {
            this.width = width;
        } else {
            this.error = true;
            System.out.println("Please enter between 0 to 20, and should be float");
        }
        return this;
    }

    public void calculatePerimeter(){
        System.out.println("Perimeter of rectangle is: " + 2 * (this.length + this.width));
    }
    public void calculateArea(){
        System.out.println("Area of rectangle is: " + (this.length * this.width));
    }

}

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        Rectangle r = new Rectangle();
        while (true) {
            System.out.println("Enter length");
            double l = scanner.nextDouble();
            System.out.println("Enter width");
            double w = scanner.nextDouble();
            r.setWidth(w).setLength(l);

            if (!r.isError()) break;
            else {
                System.out.println("Try again.");
            }
        }
        r.calculateArea();
        r.calculatePerimeter();
    }
}