Word MVC Demo

package WordMVC;

/** Application class that does wiring for MVC */
public class AppMain
{
   public static void main(String [] args)
   {
        WordModel wm = new WordModel("exhilaration");
        WordGUI gui = new WordGUI();
        WordHTMLview view = new WordHTMLview();

        wm.addObserver(gui);
        wm.addObserver(view);
        gui.update(wm,null);
        view.update(wm,null);
        WordController controller = new WordController(wm);
   }

}
package WordMVC;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.*;
import java.awt.event.*;
/** Displays the buttons and responds to clicks */
public class WordController extends JFrame implements ActionListener
{
    private WordModel model;

    private JButton left;
    private JButton right;
    public WordController(WordModel model)
    {
        this.model = model;
        left = new JButton("<");
        right = new JButton(">");
        left.addActionListener(this);
        right.addActionListener(this);
        setLayout(new FlowLayout());
        getContentPane().add(left);
        getContentPane().add(right);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        pack();
        setVisible(true);
    }

   public void actionPerformed(ActionEvent evt)
   {
       if (evt.getSource() == left)
       {
           model.goLeft();
       }
       if (evt.getSource() == right)
       {
           model.goRight();
       }

   }


}


package WordMVC;
import javax.swing.*;
import java.util.Observer;
import java.util.Observable;
/** Graphical view of the word */
public class WordGUI extends JFrame  implements Observer
{
    JLabel wordLabel = new JLabel();
    public WordGUI()
    {
        wordLabel.setText("Text appears here");
        getContentPane().add(wordLabel);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLocation(0,100);
        pack();
        setVisible(true);
    }
    public void update(Observable obs, Object obj)
    {
        wordLabel.setText(((WordModel)obs).getValue());
    }

}
package WordMVC;
import java.util.Observable;

public class WordHTMLview extends WordGUI
{
    public WordHTMLview()
    {
        super();
        setLocation(200,100);
    }

    @Override
    public void update(Observable obs, Object obj)
    {
        String display = ((WordModel)obs).getValue();
        wordLabel.setText("<HTML><I><BIG>" + display + "</BIG></I></HTML>");
        pack();
    }
}
package WordMVC;

import java.util.Observable;
/** A word that can be "rotated" left or right */
public class WordModel extends Observable
{
   private String theWord;
   public WordModel(String letters)
   {
      this.theWord = letters;
   }
   public void setValue(String letters)
   {
      this.theWord = letters;
      setChanged();
      notifyObservers();
   }
   public String getValue()
   {
      return new String(theWord);
   }
    public void goLeft()
    {
        theWord = theWord.substring(1) + theWord.charAt(0);
        setChanged();
        notifyObservers();
    }
    public void goRight()
    {
        theWord = theWord.charAt(theWord.length()-1) + theWord.substring(0,theWord.length()-1);
        setChanged();
        notifyObservers();
    }

}

package WordMVC;


/**
 * The test class WordModelTest.
 *
 * @author  jdalbey
 * @version 2014.10.10
 */
public class WordModelTest extends junit.framework.TestCase implements java.util.Observer
{
    boolean updateFlag;

    public void testLeft()
    {
        updateFlag = false;
        WordMVC.WordModel word1 = new WordMVC.WordModel("ABC");
        word1.addObserver(this);
        word1.goLeft();
        assertTrue(updateFlag);
        assertEquals("BCA", word1.getValue());
    }

    public void testRight()
    {
        updateFlag = false;
        WordMVC.WordModel word2 = new WordMVC.WordModel("XYZ");
        word2.addObserver(this);
        word2.goRight();
        assertTrue(updateFlag);
        assertEquals("ZXY", word2.getValue());
    }
    public void update(java.util.Observable obs, Object obj)
    {
        updateFlag =  true;
    }
}