Introduction to Java Programming and Data Structures  Comprehensive Version (11th Edition)
Introduction to Java Programming and Data Structures Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134700144
Author: Liang
Publisher: PEARSON
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Chapter 9, Problem 9.1PE
Expert Solution & Answer
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Program Plan Intro

Rectangle

Program plan:

  • Import required packages.
  • Declare the main class named “Main”.
    • Give the main method “public static void main ()”.
      • Create an object “myRectangle” and pass the arguments.
      • Print the area of the first rectangle along with width and height by calling the function “getArea()”
      • Print the perimeter of the first rectangle by calling the function “getPerimeter()”
      • Create another object “yourRectangle” and also pass the arguments.
      • Print the area of the second rectangle along with width and height by calling the function “getArea()”
      • Print the perimeter of the second rectangle by calling the function “getPerimeter()”
  • Define class named “MyRectangle”
    • Declare the data members and default constructor.
    • Declare a parameterized constructor.
      • Define a method “getArea()” to calculate the area of the rectangle.
      • Return the result.
      • Define a method “getPerimeter()” to calculate the perimeter of the rectangle.
      • Return the result.
Program Description Answer

The below program is used to display the area and perimeter of the two rectangles along with the width and height of the rectangles.

Explanation of Solution

Program:

// Class definition

public class One {

// Define main function

public static void main(String[] args) {

/*Create object for the class and pass the arguments */

MyRectangle myRectangle = new MyRectangle(4, 40);

// Print the area of the first rectangle

System.out.println("The area of a rectangle with width " + myRectangle.width + " and height "

+ myRectangle.height + " is " + myRectangle.getArea());

// Print the perimeter of the first rectangle

System.out.println("The perimeter of a rectangle is " + myRectangle.getPerimeter());

/* Create object for the class and pass the arguments */

MyRectangle yourRectangle = new MyRectangle(3.5, 35.9);

// Print the area of the second rectangle

System.out.println("The area of a rectangle with width " + yourRectangle.width + " and height "

+ yourRectangle.height + " is " + yourRectangle.getArea());

// Print the perimeter of the second rectangle

System.out.println("The perimeter of a rectangle is " + yourRectangle.getPerimeter());

}

}

// Class definition

class MyRectangle {

// Data members

double width = 1;

double height = 1;

// Default Constructor

public MyRectangle() {

}

// Parameterized Constructor

public MyRectangle(double newWidth, double newHeight) {

width = newWidth;

height = newHeight;

}

// Method to get the area of rectangle

public double getArea() {

/* Return the area value by multiplying width and height */

return width * height;

}

// Method to get the perimeter of rectangle

public double getPerimeter() {

/*Return the perimeter value by multiplying 2 with width and height */

return 2 * (width + height);

}

}

Sample 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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