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Java Program to Find out the Area and Perimeter of Rectangle using Class Concept
Java Language is one of the most used popular object - oriented programming language in present world. Class concept is one of the most important feature in Object - oriented languages. A Class is a like a blue print of an object. For example, when we want to build a house we first create a blue print of the house in other words we create a plan showing how we are going to build the house. Based on the plan we can create a number of houses. Similarly using class, we can create a number of objects. A class is a blueprint for creating a number of objects where objects are the real world entities like car, bike, pen etc. A class has all the characteristics of an object and objects has values for those characteristics. In this article, we are going to write a java program to find the perimeter and area of a rectangle using class concept.
A Class consists of the following ?
Data Members ? Data Members represent the characteristics/properties of a collection of objects
Methods ? Methods represents the actions performed by an object.
For an example, if we consider a person as a class, then the properties like name, age, address are the data members and the actions performed by a person like sit, stand, eat, walk are the methods of the class.
Syntax to create a class
class ClassName
{
//data members
//methods
}
ClassName always starts 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 to create an object
ClassName objectname = new ClassName();
Example
Person person_one =new Person();
Perimeter of a rectangle
The perimeter of a rectangle is the total area covered by the sides of the rectangle, which 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 a rectangle
Area of a rectangle is the total space occupied by the rectangle in a 2-d 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 name Rectangle which has "area()" and "perimeter()" methods. These functions give us the area of the Rectangle and the Perimeter of a rectangle as output.
STEP 2 ? Now, in the main class create an Object of the rectangle using the constructor.
STEP 3 ? Now call the respective functions to find the area of rectangle and perimeter of rectangle using the created Object.
Example
In this example, we create a custom Rectangle class which has "area()" and "perimeter()" methods. We then create an object of Rectangle class in main class using a constructor of main class and call respective 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)
Thus in this article, we have learnt how to implement java code to find the area and perimeter of a rectangle using Class concept.
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