How to find area of cylinder by using Scanner class in java

Hello guys, welcome to Lingarajtechhub. Today we are going to discuss finding the area of cylinder by using Scanner class in java.

Code:

package com.Arithmatic_operator.java;
import java.util.Scanner;
public class Area_of_Cyllinder
{
  public static void main(String[] args) 
  {
	double area,pi=3.141,rad,hgt;
		Scanner sc=new Scanner(System.in);
	System.out.println("Enter value of cylinder radius");
		rad=sc.nextDouble();
		System.out.println("Enter va;ue of cylinder height");
		hgt=sc.nextDouble();
		area=2*(pi*rad*hgt)+(pi*rad*rad);
		System.out.println("The area of cylinder is "+area);
		
}

}

Line-1:

package com.Arithmatic_operator.java;

–> It is a java package( com.Arithmatic_operator.java) which is collection of classes and this package is created in java project.

Line-2:

import java.util.Scanner;

–> Scanner is a class in java. util package used for obtaining the input of the primitive types like int, double, etc. and strings.

Line-3:

public class Area_of_Cyllinder

–>Here Area_of_Cyllinder is defined as a class which is a template used to create objects and to define object data types and methods.
–> And its define as public because it access any where.

Line-5:

public static void main(String[] args)

–> It is a main method in which we can execute a program
–>public :it is a access modifier of the main function which is must be public so that the JRE which is (Java Run Time Environment)can access and execute this method.
–> If a method is not public, then access is restricted and its showing error
–> static is a keyword in which main method has must to be static in which JVM can load the class into memory and call the main method without creating an instance
–> void it means no return type
–> main() is function
–> string[]args : string means collection of charecters ,String[] args represents a collection of Strings that are separated by a space and can be typed into the program on the terminal directly

Line-7:

double area,pi=3.141,rad,hgt;

–>Here we Declare 4 variable area ,pi (which value is 3.141 is assih=gn to pi),rad,hgt which is double type

Line-8:

Scanner sc=new Scanner(System.in);

–>here scanner is a class and Sc is the instance of the object which is new Scanner.System.in is an argument

Line-9:

System.out.println(“Enter value of cylinder radius”);

–>It means System is a class name and out is an instance of the System println is print a new line

Line-10:

rad=sc.nextDouble();

–> Here rad is a variable that we take and sc is our instance name which is create for a object and nextDouble() is a method method of a Scanner object reads in a string of digits or char and converts them into a double type

Line-13:

area=2(pi*rad*hgt)+(pirad*rad);

–>here we apply the logic to find the area of cylinder,the formula is 2(piradhgt)+(pi*(rad*rad)),after find this value it assign to area value