The Rectangle class Following the example of the Circle clas

(The Rectangle class) 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.

Using this template

Solution

Exercise09_01.java

public class Exercise09_01 {
public static void main(String[] args) {
Rectangle myRectangle = new Rectangle(4, 40);
System.out.println(\"The area of a rectangle with width \" +
myRectangle.width + \" and height \" +
myRectangle.height + \" is \" +
myRectangle.getArea());
System.out.println(\"The perimeter of a rectangle is \" +
myRectangle.getPerimeter());

Rectangle yourRectangle = new Rectangle(3.5, 35.9);
System.out.println(\"The area of a rectangle with width \" +
yourRectangle.width + \" and height \" +
yourRectangle.height + \" is \" +
yourRectangle.getArea());
System.out.println(\"The perimeter of a rectangle is \" +
yourRectangle.getPerimeter());
}
}

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

Output:

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