<br />
/***********************************************************************<br />
  Program Name: Circle.java<br />
  Programmers Name: Glen Ciszewski<br />
  Program Description: This program will calculate the area, circumference and diameter of a circle<br />
  ***********************************************************************/<br />
import javax.swing.JOptionPane;<br />
public class Circle <br />
{<br />
<br />
   <br />
   public static void main(String[] args) <br />
   {<br />
      String userInput;      //number entered by user<br />
      int radius;            //converted input for number<br />
      double diameter;      //the diamater of the circle<br />
      double circumference;   //the circumference of the circle<br />
      double area;         //the area of the circle<br />
      <br />
      //read in the users input as string<br />
      userInput = JOptionPane.showInputDialog("Enter in the radius");<br />
      <br />
      //convert number from string to type int<br />
      radius = Integer.parseInt(userInput);<br />
      <br />
      //find the diameter<br />
      diameter = 2*radius;<br />
      <br />
      //display the diameter<br />
      JOptionPane.showMessageDialog(null,"The diameter is " + diameter,<br />
            "Results",<br />
            JOptionPane.PLAIN_MESSAGE);<br />
      <br />
      //find the circumference<br />
      circumference = 2*Math.PI*radius;<br />
      <br />
      //display the circumference<br />
      JOptionPane.showMessageDialog(null,"The circumference is " + circumference,<br />
            "Results",<br />
            JOptionPane.PLAIN_MESSAGE);<br />
      <br />
      //find the area<br />
      area = Math.PI*radius*radius;<br />
      <br />
      //display the area<br />
      JOptionPane.showMessageDialog(null,"The area is " + area,<br />
            "Results",<br />
            JOptionPane.PLAIN_MESSAGE);<br />
      System.exit(0);<br />
      <br />
    }<br />
<br />
}<br />