(The Rectangle class) Following the example of the Circle class in Section 9.2,
ID: 3934470 • Letter: #
Question
(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
Explanation / Answer
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
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