Write a program to find the Area of Circle in java

Hello guys, welcome to lingarajtechhub.com . Today we are going to discuss about Area of Circle in java.

Code:

package com.Area_Circle.java;
public class Area {
	 static int r=5;
	 static double Area_of_circle=3.14*r*r;
	public static void main(String[] args) {
		System.out.println("area of circle is:"+Area_of_circle);
	}
}

Line-1:

package com.Area_Circle.java

It is a java package , this package is created in a java project and it contains classes inside the package.

Line-2:

public class Area

Here “Area” is the class-name , class is a template used to create objects & class-name first letters must be capital. It is public means we can use this ,outside of this package.

Line-3:

static int r=5

Static int means Integer value belongs to class.Here int(integer) is a data type. r is the variable name and assigned value 5.

Line-4:

static double Area_of_circle=3.14*r*r

Static double means double value belongs to class.Here double is a data type. “Area_of_circle” is the variable name and the formula of circle is (PI*r^2).

Line-5:

public static void main(String[] args)

It is a main method in which we can execute a program.

public : It is an access modifier. The main() is public because we can access main() outside of the class , if main() can’t be public then JVM(Java Virtual Machine) can’t be called main() & code can’t be executed.
Static : static is a keyword in which the main method has to be static in which JVM can load the class into memory and call the main method without creating an instance.
Void : Void is a data type. It means no return type. → main(): Main is a function.
String [] args : string means collection of characters ,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-6: