Question

Please use Java to answer the question.

(The Rectangle class) Following the example of the Circle class in Section 8.2,
design a class named Rectangle to represent a rectangle. The class contains:

■ Two double data fields named width and height that specify the width and
height of the rectangle. The default values are 1 for both width and height.
■ A no-arg constructor that creates a default rectangle.
■ A constructor that creates a rectangle with the specified width and height.
■ A method named getArea() that returns the area of this rectangle.
■ A method named getPerimeter() that returns the perimeter.

Draw the UML diagram for the class and then implement the class. Write a test
program that creates two Rectangle objects—one with width 4 and height 40
and the other with width 3.5 and height 35.9. Display the width, height, area,
and perimeter of each rectangle in this order.

Please follow the standard output

The·area·of·a·4.0·x·40.0·Rectangle·is·160.0↵

The·perimeter·of·a·4.0·x·40.0·Rectangle·is·88.0↵

The·area·of·a·3.5·x·35.9·Rectangle·is·125.64999999999999↵

The·perimeter·of·a·3.5·x·35.9·Rectangle·is·78.8↵

Answer 1

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.TreeMap;


class Rectangle{
    private double width,height;
    Rectangle(){
        width = 1;
        height = 1;
    }
    Rectangle(double width, double height){
        this.width = width;
        this.height = height;
    }
    public double getArea(){
        return width*height;
    }
    public double getPerimeter(){
        return 2*(width+height);
    }

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        this.width = width;
    }

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }
}

class Main{
    public static void main(String[] args) {
        Rectangle r1 = new Rectangle(4,40);
        System.out.println("The area of "+r1.getWidth()+" x "+r1.getHeight()+" is "+r1.getArea());
        System.out.println("The perimeter of "+r1.getWidth()+" x "+r1.getHeight()+" is "+r1.getPerimeter());
        Rectangle r2 = new Rectangle(3.5,35.9);
        System.out.println("The area of "+r2.getWidth()+" x "+r2.getHeight()+" is "+r2.getArea());
        System.out.println("The perimeter of "+r2.getWidth()+" x "+r2.getHeight()+" is "+r2.getPerimeter());

    }
}

OUTPUT :

UML DIAGRAM :