# BlueJ (area of circle)

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Al Russrum
BlueJ (area of circle)
3 Answer(s)      6 years and 6 months ago
Posted in : Java Beginners

How does one write a program to calculate the area of a circle in BlueJ? Note that the user will have to provide the radius.

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April 7, 2011 at 12:41 AM

A simple program to calculate the area of a circle. radius provided by user.

this is what i got but i can't compile it without an error. please help if you identify my mistake.

public class stage1 { // BEGIN Area of Circle

```/**
*    Get radius from user
*    Set area = Math.Pi * radius * radius
*    Output "Area : " area
* END Area of Circle
*/

public static void main(String [] areaCircle)
{
Scanner keyboard = new Scanner(System.in);
System.out.println("Enterh the circle's radius: ");
double radius = keyboard.nextDouble();
System.out.println("int Area");
}
```

}

April 7, 2011 at 10:28 AM

```import java.util.Scanner;
public class AreaOfCircle {

public static void main(String [] str)
{
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter the circle's radius: ");
double radius = keyboard.nextDouble();
double PI=3.14;
double area=PI*radius*radius;
System.out.println("Area of circle: "+area);
}
}
```

July 27, 2013 at 12:01 AM

```import javax.swing.JOptionPane;
public class constant
{
public static void main(String[]args)
{

final double PI = 3.142;
double R1,R2,area,average;
String input;

input= JOptionPane.showInputDialog("AREA");
area=Integer.parseInt(input);

input= JOptionPane.showInputDialog("Radius 1");
R1=Integer.parseInt(input);

input= JOptionPane.showInputDialog("Radius 2");
R2=Integer.parseInt(input);

average=(area=PI*R1*R2);

JOptionPane.showMessageDialog(null,"Area of circle: "+ area);
System.exit(0);
```

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