


Write a Java program to calculate the area and perimeter of a rectangle using the concept of classes
The Java language is one of the most commonly used object-oriented programming languages in the world today. The concept of class is one of the most important features in object-oriented languages. A class is like a blueprint for an object. For example, when we want to build a house, we first create a blueprint of the house, in other words, we create a plan that shows how we are going to build the house. According to this plan we can build many houses. Likewise, using classes, we can create many objects. Classes are blueprints for creating many objects, where objects are real-world entities like cars, bikes, pens, etc. A class has the characteristics of all objects, and the objects have the values of these characteristics. In this article, we will write a Java program to find the perimeter and area of a rectangle using the concept of classes.
A class includes the following contents −
Data members - Data members represent the characteristics/properties of the object collection
Methods - Methods represent operations performed by an object.
For example, if we regard a person as a class, then attributes such as name, age, and address are data members, and actions such as sitting, standing, eating, and walking are methods of the class.
Syntax for creating classes
class ClassName { //data members //methods }
Class names always start with a capital letter. For example, Person, House, Bank, etc.
Example
class Person{ //data members String name; int age; String city; //methods void read(){ System.out.println(“Reading”); } }
Syntax for creating objects
ClassName objectname = new ClassName();
Example
Person person_one =new Person();
Perimeter of the rectangle
The perimeter of a rectangle is the total area enclosed by the four sides of the rectangle, that is, the area covered by the length and width of the rectangle.
formula
Perimeter of the rectangle = area covered by the sides of the rectangle = 2(l+w) where, l : length of rectangle w : width of rectangle
Area of rectangle
The area of a rectangle is the total space occupied by the rectangle on a two-dimensional plane.
formula
Area of the rectangle = area covered by the rectangle = l*w where , l : length of rectangle w : width of rectangle
algorithm
Step 1 − Create a custom class named Rectangle, which has "area()" and "perimeter()" methods. These functions give the area and perimeter of the rectangle as output respectively.
Step 2 − Now, create a rectangular object using the constructor in the main class.
Step 3 − Now call the corresponding functions to find the area and perimeter of the rectangle using the created object.
Example
In this example, we created a custom Rectangle class with "area()" and "perimeter()" methods. Then, use the constructor of the main class in the main class to create an object of the Rectangle class, and call the corresponding methods area() and perimeter() on the created object. Once the methods are called, they are executed and the output is printed.
// Java program to calculate the area and perimeter of a rectangle using class concept import java.util.*; // Rectangle Class File class Rectangle { // data members int length, width; // methods //constructor to create Object Rectangle(int length, int width) { this. length = length; this.width = width; } // prints the area of rectangle public void area() { int areaOfRectangle; areaOfRectangle = this.length * this.width; System.out.println("Area of rectangle with the given input is : " + areaOfRectangle); } // prints the perimeter of rectangle public void perimeter() { int perimeterOfRectangle; perimeterOfRectangle = 2 * (this.length + this.width); System.out.println("Perimeter of rectangle with the given input is : " + perimeterOfRectangle); } } public class Main { public static void main(String args[]) { Rectangle rect_obj = new Rectangle(10,5); // obect creation System.out.println("Length = " + rect_obj.length); System.out.println("Width = " + rect_obj.width); rect_obj.area(); // returns area of rectangle rect_obj.perimeter(); //returns perimeter of rectangle } }
Output
Length = 10 Width = 5 Area of rectangle with the given input is : 50 Perimeter of rectangle with the given input is : 30
Time complexity: O(1) Auxiliary space: O(1)
So, in this article, we learned how to implement Java code using the concept of classes to find the area and perimeter of a rectangle.
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