//MessageDialogDemo.java
//demo of output with JOptionPane windows.
//similar to System.out.println and g.drawString

import javax.swing.*;     //needed for JOptionPane

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

	String name;   
	int age;              
	double radius, circumference, area;
	String firstName, lastName;

	firstName = "Fred";
	lastName = "Smith";
	name = firstName + " " + lastName;  

	//JOptionPane output dialog windows.
	//showMessageDialog displays a string
	JOptionPane.showMessageDialog( null, "Welcome: " + name );
	//null must be the first argument.
	//2nd argument is string, here concatenation.

	age = 23;
	JOptionPane.showMessageDialog( null, "You are " + age + " years old");
	
	radius = 12.5;
	circumference = 2 * Math.PI * radius;
	area = Math.PI * radius*radius;

	JOptionPane.showMessageDialog( null, "Circumference=" + circumference +
				             "\nArea=" + area);
    }
}