# 8+ Java Programs to Calculate Area of a Circle

This post contains a total of 8+ Java Program Examples with Source Code to Calculate the Area of a Circle. All these Circle Area Calculator programs are made using Java.

You can use the source code of these examples with credits to the original owner.

## Java Programs to Calculate Area of Circle

### 1. By Ahmed Mahmoud

Made by Ahmed Mahmoud. Basic Program for calculating area of circle. Source

```Enter the ridius in cm please!
10
Area=314.0cm^2
```
``````import java.util.Scanner;
public class CircleArea
{
public static void main(String[] args) {
double R,A;
System.out.println("Enter the ridius in cm please!");
Scanner s = new Scanner(System.in);
R = s.nextDouble();
A = R*R*3.14;
System.out.println("Area="+A+"cm^2" );
System.out.println("thanks for checking my code");
}
}``````

### 2. By JosΓ© Baltazar Castillo RodrΓ­guez

Made by JosΓ© Baltazar Castillo RodrΓ­guez. Basic Java Program for Calculating Area of a Circle. Source

```Enter value of circle radio: 11
The cicle area with radio 11.0 is: 380.132711084365```
``````import java.util.Scanner;

public class Program

{
public static void main(String[] args) {

Scanner sc= new Scanner (System.in);

System.out.println("Enter value of circle radio: ");

System.out.println("The cicle area with radio " + Radio+ " is: " + Area);

}
}``````

### 3. By Takudzwa Nelson Chiutaalenga

Made by Takudzwa Nelson Chiutaalenga. Circle Area and Circumference Calculator. Source

```Enter the radius: 12
The area of circle is: 452.3893421169302
The circumference of the circle is:75.39822368615503```
``````import java.util.Scanner;

class Program {

static Scanner sc = new Scanner(System.in);

public static void main(String args[]) {

/*We are storing the entered radius in double
* because a user can enter radius in decimals
*/

double area = Math.PI * (radius * radius); System.out.println("The area of circle is: " + area);

double circumference= Math.PI * 2*radius; System.out.println( "The circumference of the circle is:"+circumference) ;

}
}``````

### 4. By Ivy

```Radius of circle = 13.0
Area = 530.929158456675
Circumference = 81.68140899333463```
``````import java.util.*;
class Circle{
public double area(double r){
double a = Math.PI*r*r;
return a;
}
public double circumference(double r){
double c = 2*Math.PI*r;
return c;
}
public static void main(String args[]){
double x,y,z;
Circle obj1 = new Circle();
Circle obj2 = new Circle();
Scanner sc = new Scanner(System.in);
x = sc.nextDouble();
y = obj1.area(x);
z = obj2.circumference(x);
System.out.println("Radius of circle = "+x+"\nArea = "+y+"\nCircumference = "+z);
}
}``````

```Enter a number for radius 14
The area of the circle of radius 14.0 = 615.75164```
``````import java.util.Scanner ;

public class AreaOfCircle
{
public static void main(String[] args) {
final double PI = 3.14159;
Scanner input = new Scanner (System.in);

System.out.println ("Incorrect input");
}else {
System.out.println("The area of the circle of radius " + radius +" = "+ area);
}

}
}``````

### 6. By Ridha Al Awami

Made by Ridha Al Awami. Source

```15
the circumference of the circle is = 94.24777960769379
area of the circle =706.8583470577034
```
``````public class Program
{
public static void main(String[] args) {
/* More complex operations
* by using Math class to calculate the circumference and the area of a circle
*/
// r is the radius of the circle
double r = 15;
double circleCircumference = 2 * Math.PI * r;
double circleArea = Math.PI * Math.pow(r,2);
System.out.println("the circumference of the circle is = " + circleCircumference);
System.out.println("area of the circle =" + circleArea );
}
}``````

### 7. By Shahida Khanam

Made by Shahida Khanam. Simple Java Program to Find Area of a Circle using Radius Input. Source

```write the radius of the circle: 16
the area of the circle is: 804.352```
``````import java.util.Scanner;

public class Program
{
public static void main(String[] args) {

double pi=3.142;
int r;
double result;

Scanner input = new Scanner(System.in);
System.out.println("write the radius of the circle: ");

r = input.nextInt();

result = pi*r*r;
System.out.println(" the area of the circle is: " +result);

}
}``````

### 8. By Nil Lumacang

```radius of circle = 17
Circle area  =  907.9202768874503```
``````import java.io.BufferedReader;
import java.io.IOException;

public class CircleArea {

public static void main(String[] args) {

try
{
}

catch(NumberFormatException ne)
{
System.exit(0);
}
catch(IOException ioe)
{
System.out.println("IO Error :" + ioe);
System.exit(0);
}

System.out.println(" Circle area  =  " + area);
}
}``````

### 9. By Ellapu Keerthi

```18
area of circle = 1017.36```
``````import java.util.Scanner ;
class circle {
public static void main (String args [])
{
float  r , t;
Scanner k = new Scanner (System.in) ;
r=k.nextInt();
t=3.14f*r*r;
System.out.println("area of circle = " + t);
}
}``````