/**
 * The main class of a simple calculator. Create one of these and you'll
 * get the calculator on screen.
 * 
 * @author: Michael Kölling and David J. Barnes
 * @version 2011.07.31
 */
public class Calculator
{
    private CalcEngine engine;
    private UserInterface gui;

    /**
     * Create a new calculator and show it.
     */
    public Calculator()
    {
        engine = new CalcEngine();
        gui = new UserInterface(engine);
    }

    /**
     * In case the window was closed, show it again.
     */
    public void show()
    {
        gui.setVisible(true);
    }
}