CS1 Standard Demo Page

/*
 * This interpreter is intended to paint different colored dots in a window. 
 * 
 * The commands that the interpreter can recognize and respond to are: 
 * -BLUE: paint a blue dot
 * -RED: paint a red dot
 * -HELP: show a list of the commands in a dialog message box
 * -EXIT: terminate the program
 */
package interpreters;

import java.awt.Color;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import painter.SPainter;
import shapes.SCircle;

/**
 *
 * @author ecuevas
 */
public class Interpreter3 {
    
    private void interpreter3() {
    // CREATE OBJECTS TO THINK WITH
    SPainter miro = new SPainter("Dot Thing", 400,400);
    miro.setScreenLocation(0, 0);
    SCircle dot = new SCircle(180);
    
    //REPEATEDLY TAKE A COMMAND FROM AN INPUT DIALOG BOX AND INTERPRET IT
    while (true) {
        String command = JOptionPane.showInputDialog(null,"Command?");
        if ( command == null ) { command = "exit"; } // user clicked on Cancel
        if ( command.equalsIgnoreCase("blue") ) {
            miro.setColor(Color.BLUE);
            miro.paint(dot);
        } else if ( command.equalsIgnoreCase("red")) {
            miro.setColor(Color.RED);
            miro.paint(dot);
        } else if (command.equalsIgnoreCase("green")) {
            miro.setColor(Color.GREEN);
            miro.paint(dot);
        }  else if (command.equalsIgnoreCase("yellow")) {
            miro.setColor(Color.YELLOW);
            miro.paint(dot);
        } else if (command.equalsIgnoreCase("random")) {
            miro.setColor(randomColor());
            miro.paint(dot);
        } else if (command.equalsIgnoreCase("help")) {
            JOptionPane.showMessageDialog(null, "valid commands are:"
                    + "RED | BLUE | GREEN | RANDOM | YELLOW | HELP | EXIT ");
        } else if (command.equalsIgnoreCase("exit") ) {
           miro.end();
           System.out.println("Thank you for viewing the dots...");
           break;
        } else {
            JOptionPane.showMessageDialog(null,"Unrecognizable command: "
                    + command.toUpperCase());
        }
      } 
    
    }
    
    // INFRASTRUCTURE FOR SOME SIMPLE PAINTING
    
    public Interpreter3() {
        interpreter3();
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Interpreter3();
            }
        });
    }

    private Color randomColor() {
        int rv = (int)(Math.random()*256);
        int gv = (int)(Math.random()*256);
        int bv = (int)(Math.random()*256);
        return new Color(rv,gv,bv);
    }
    
}