Question

IN JAVA PLEASE, USE COMMENTS

Following the example of Circle class, 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 specified width and height

• A method name getWidth() return the value of width

• A method named getHeight() returns value of height

• A method named setWidth(double) set the width with given value

• A method named setHeight(double) set the height with given value

• A method named getArea() that returns the area of this rectangle

• A method getPerimeter() that returns the perimeter

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.

Answer 1

Here is the Java code for given question.

Output screenshot is added at the end.

Code:

Rectangle.java:

public class Rectangle {

    double width,height;      /*data fields*/


    //no-arg constructor
    public Rectangle(){
        this.width=1;
        this.height=1;
    }

    //parameterized constructor
    public Rectangle(double width, double height) {
        this.width = width;
        this.height = height;
    }

    //getter for width
    public double getWidth() {
        return width;
    }

    //getter for height
    public double getHeight() {
        return height;
    }

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

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

    //method to get area of rectangle
    public double getArea(){

        return this.getWidth()*this.getHeight();

    }

    //method to return perimeter of rectangle
    public double getPerimeter(){

        return this.getWidth()+this.getHeight();

    }
}

Test program(RectangleDriver.java):

public class RectangleDriver {

    public static void main(String[] args){

        //creates a new Rectangle object
        Rectangle rectangle1=new Rectangle(4,40);


        //craetes a new Rectangle object
        Rectangle rectangle2=new Rectangle(3.5,35.9);

        //prints details of rectangle 1
        System.out.println("Rectangle 1:\nWidth: "+rectangle1.getWidth()+"\nHeight: "+rectangle1.getHeight()+"\nArea: "+rectangle1.getArea()+"\nPerimeter: "+rectangle1.getPerimeter());

        //prints details of rectangle 2
        System.out.println("\nRectangle 2:\nWidth: "+rectangle2.getWidth()+"\nHeight: "+rectangle2.getHeight()+"\nArea: "+rectangle2.getArea()+"\nPerimeter: "+rectangle2.getPerimeter());

    }
}

Output: