// Ask user for name, 
// then greet that person.
// Obtain input with input dialog;
// show output with output dialog.

import javax.swing.JOptionPane;
public class Greeter1
{
    public static void main(String[] args)
    {
        // Declare name.
        String name;

        // Ask for name in input box.
        name = JOptionPane.showInputDialog(null, "Enter your name.");

        // Show message box with greeting.
        JOptionPane.showMessageDialog(null, "Hello, " + name + ".");
    }
}

// Prompt in input dialog:
Enter your name:

// Sample input to input dialog:
Bob

// Output message in message dialog:
Hello, Bob.