Question

(The Rectangle class) (WOULD APPRECIATE IT IF THE PROGRAM/ANSWER COULD BE DIRECTLY COPY AND PASTED, also this should be in java)

Following the example of the Circle class in Section 9.2, 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.

Sample Run

The area of a rectangle with width 4.0 and height 40.0 is 160.0
The perimeter of a rectangle is 88.0
The area of a rectangle with width 3.5 and height 35.9 is 125.64999999999999
The perimeter of a rectangle is 78.8

Class Name: Exercise09_01

Answer 1

import java.util.*;
//class Rectangle
class Rectangle
{
  //data fields
  private double width,height;
  //no-arg constructor
  public Rectangle()
  {
    this.width = 1;
    this.height = 1;
  }
  //argument constructor
  public Rectangle(double w,double h)
  {
    this.width = w;
    this.height = h;
  }
  //get width
  public double getWidth()
  {
    return width;
  }
  //get height
  public double getHeight()
  {
    return height;
  }
  //function to calculate area
  double getArea()
  {
    double area = width*height;
    return area;
  }
  //function to calculate perimeter
  double getPerimeter()
  {
    double perimeter = 2*(height+width);
    return perimeter;
  }
}
//driver code
class Main {
  public static void main(String[] args) {
    //created object of class Rectangle rec1
    Rectangle rec1 = new Rectangle(4,40);
    double area = rec1.getArea();
    double perimeter = rec1.getPerimeter();
    System.out.println("The area of a rectangle with width  "+rec1.getWidth()+" and height "+rec1.getHeight()+" is "+area);
    System.out.println("The perimeter of rectangle is "+perimeter);

    //created object of class Rectangle rec2
    Rectangle rec2 = new Rectangle(3.5,35.9);
    double area1 = rec2.getArea();
    double perimeter1 = rec2.getPerimeter();
    System.out.println("The area of a rectangle with width  "+rec2.getWidth()+" and height "+rec2.getHeight()+" is "+area1);
    System.out.println("The perimeter of rectangle is "+perimeter1);



  }
}

Output::

Note:: If any queries please comment.