java/3-0-MVC/hellomvc2/Main.java

+// HelloMVC: a simple MVC example
+// the model is just a counter
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+/**
+ * Two views coordinated with the observer pattern.  Separate controller.
+ * The mechanics of a separate controller are starting to break down.
+ */
+
+import javax.swing.*;
+import java.awt.Dimension;
+import java.awt.GridLayout;
+import java.awt.event.*;
+
+public class Main {
+
+	public static void main(String[] args){
+		JFrame frame = new JFrame("HelloMVC2");
+
+		// create Model and initialize it
+		Model model = new Model();
+		// create Controller, tell it about model
+		Controller controller = new Controller(model);
+		// create View, tell it about model and controller
+		View view = new View(model, controller);
+		// tell Model about View
+		model.addView(view);
+
+		// create second view ...
+		View2 view2 = new View2(model, controller);
+		model.addView(view2);
+
+		// create a layout panel to hold the two views
+		JPanel p = new JPanel(new GridLayout(2,1));
+		frame.getContentPane().add(p);
+
+		// add views (each view is a JPanel)
+		p.add(view);
+		p.add(view2);
+
+		// setup the window
+		frame.setPreferredSize(new Dimension(300,300));
+		frame.pack();
+		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		frame.setVisible(true);
+	}
+}

java/3-0-MVC/hellomvc2/Model.java

+import java.util.ArrayList;
+
+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+// View interface
+interface IView {
+	public void updateView();
+}
+
+public class Model {	
+
+	// the data in the model, just a counter
+	private int counter;	
+	
+	// all views of this model
+	private ArrayList<IView> views = new ArrayList<IView>();
+	
+	// set the view observer
+	public void addView(IView view) {
+		views.add(view);
+		view.updateView();
+	}
+	
+	public int getCounterValue() {
+		return counter;
+	}
+	
+	public void incrementCounter() {
+		if (counter < 5) {
+			counter++;
+			System.out.println("Model: increment counter to " + counter);
+			notifyObservers();
+		}
+	} 	
+	
+	// notify the IView observer
+	private void notifyObservers() {
+		for (IView view : this.views) {
+			System.out.println("Model: notify View");
+			view.updateView();
+		}
+	}
+}

java/3-0-MVC/hellomvc2/View.java

+// HelloMVC: a simple MVC example
+// the model is just a counter
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.event.*;
+
+class View extends JPanel implements IView {
+
+	// the view's main user interface
+	private JButton button;
+
+	// the model that this view is showing
+	private Model model;
+
+	View(Model model, Controller controller) {
+		
+		// create the view UI
+		button = new JButton("?");
+		button.setMaximumSize(new Dimension(100, 50));
+		button.setPreferredSize(new Dimension(100, 50));
+		// a GridBagLayout with default constraints centres
+		// the widget in the window
+		this.setLayout(new GridBagLayout());
+		this.add(button, new GridBagConstraints());
+
+		// set the model
+		this.model = model;
+		// setup the event to go to the controller
+		button.addActionListener(controller);
+	}
+
+	// IView interface
+	public void updateView() {
+		System.out.println("View: updateView");
+		button.setText(Integer.toString(model.getCounterValue()));
+	}
+}

java/3-0-MVC/hellomvc2/View2.java

+// HelloMVC: a simple MVC example
+// the model is just a counter
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.FlowLayout;
+import java.awt.Color;
+import java.awt.event.*;
+import java.util.*;
+
+class View2 extends JPanel implements IView {
+
+	// the model that this view is showing
+	private Model model;
+	private JLabel label = new JLabel();
+
+	View2(Model model, Controller controller) {
+
+		// create UI
+		setBackground(Color.WHITE);
+		setLayout(new FlowLayout(FlowLayout.LEFT));
+		this.add(this.label);
+
+		// set the model
+		this.model = model;
+		
+		// setup the event to go to the controller
+		addMouseListener(controller);
+	}
+
+	// IView interface
+	public void updateView() {
+		System.out.println("View2: updateView");
+		// just displays an 'X' for each counter value
+		String s = "";
+		for (int i=0; i<this.model.getCounterValue(); i++) s = s + "X";
+		this.label.setText(s);
+	}
+}

java/3-0-MVC/hellomvc2/makefile

+# super simple makefile
+# call it using 'make NAME=name_of_code_file_without_extension'
+# (assumes a .java extension)
+NAME = "Main"
+
+all:
+	@echo "Compiling..."
+	javac *.java
+
+run: all
+	@echo "Running..."
+	java $(NAME)
+
+clean:
+	rm -rf *.class

java/3-0-MVC/hellomvc3/Main.java

+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+/**
+ * Two views with integrated controllers.
+ */
+
+import javax.swing.*;
+import java.awt.Dimension;
+import java.awt.GridLayout;
+import java.awt.event.*;	
+
+public class Main {
+
+	public static void main(String[] args){	
+		JFrame frame = new JFrame("HelloMVC3");
+		
+		// create Model and initialize it
+		Model model = new Model();
+		
+		// create View, tell it about model
+		View view = new View(model);
+		// tell Model about View. 
+		model.addView(view);
+		
+		// create second view ...
+		View2 view2 = new View2(model);
+		model.addView(view2);
+		
+		// create a layout panel to hold the two views
+		JPanel p = new JPanel(new GridLayout(2,1));
+		frame.getContentPane().add(p);
+
+		// add views (each view is a JPanel)
+		p.add(view);
+		p.add(view2);
+		
+		// create the window
+		frame.setPreferredSize(new Dimension(300,300));
+		frame.pack();
+		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		frame.setVisible(true);
+	} 
+}

java/3-0-MVC/hellomvc3/Model.java

+import java.util.ArrayList;
+
+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+// View interface
+interface IView {
+	public void updateView();
+}
+
+public class Model {	
+	
+	// the data in the model, just a counter
+	private int counter;	
+	// all views of this model
+	private ArrayList<IView> views = new ArrayList<IView>();
+
+	// set the view observer
+	public void addView(IView view) {
+		views.add(view);
+		// update the view to current state of the model
+		view.updateView();
+	}
+	
+	public int getCounterValue() {
+		return counter;
+	}
+	
+	public void incrementCounter() {
+		if (counter < 5) {
+			counter++;
+			System.out.println("Model: increment counter to " + counter);
+			notifyObservers();
+		}
+	} 	
+	
+	// notify the IView observer
+	private void notifyObservers() {
+			for (IView view : this.views) {
+				System.out.println("Model: notify View");
+				view.updateView();
+			}
+	}
+}

java/3-0-MVC/hellomvc3/View.java

+// HelloMVC: a simple MVC example
+// the model is just a counter
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.event.*;
+
+class View extends JPanel implements IView {
+
+	// the view's main user interface
+	private JButton button;
+
+	// the model that this view is showing
+	private Model model;
+
+	public View(Model model) {
+		
+		// create the view UI
+		button = new JButton("?");
+		button.setMaximumSize(new Dimension(100, 50));
+		button.setPreferredSize(new Dimension(100, 50));
+		// a GridBagLayout with default constraints centres
+		// the widget in the window
+		this.setLayout(new GridBagLayout());
+		this.add(button, new GridBagConstraints());
+
+		// set the model
+		this.model = model;
+
+		// setup the event to go to the "controller"
+		// (this anonymous class is essentially the controller)
+		button.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent e) {
+				model.incrementCounter();
+			}
+		});
+	}
+
+	// IView interface
+	public void updateView() {
+		System.out.println("View: updateView");
+		button.setText(Integer.toString(model.getCounterValue()));
+	}
+}

java/3-0-MVC/hellomvc3/View2.java

+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.FlowLayout;
+import java.awt.Color;
+import java.awt.event.*;
+import java.util.*;
+
+class View2 extends JPanel implements IView {
+
+	// the model that this view is showing
+	private Model model;
+	private JLabel label = new JLabel();
+
+	View2(Model model) {
+		// create UI
+		setBackground(Color.WHITE);
+		setLayout(new FlowLayout(FlowLayout.LEFT));
+
+		// set the model
+		this.model = model;
+		
+		// setup the event to go to the "controller"
+		// (this anonymous class is essentially the controller)		
+		addMouseListener(new MouseAdapter() {
+				public void mouseClicked(MouseEvent e) {
+					model.incrementCounter();
+				}
+		});
+
+		this.add(this.label);
+	}
+
+	// IView interface
+	public void updateView() {
+		System.out.println("View2: updateView");
+		// just displays an 'X' for each counter value
+		String s = "";
+		for (int i=0; i<this.model.getCounterValue(); i++) s = s + "X";
+		this.label.setText(s);
+	}
+}

java/3-0-MVC/hellomvc3/makefile

+# super simple makefile
+# call it using 'make NAME=name_of_code_file_without_extension'
+# (assumes a .java extension)
+NAME = "Main"
+
+all:
+	@echo "Compiling..."
+	javac *.java
+
+run: all
+	@echo "Running..."
+	java $(NAME)
+
+clean:
+	rm -rf *.class

java/3-0-MVC/hellomvc3b/Main.java

+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+/**
+ * Views using a listener anonymous class to handle Model update "events".
+ */
+
+import javax.swing.*;
+import java.awt.Dimension;
+import java.awt.GridLayout;
+import java.awt.event.*;	
+
+public class Main {
+
+	public static void main(String[] args){	
+		JFrame frame = new JFrame("HelloMVC3b");
+		
+		// create Model and initialize it
+		Model model = new Model();
+		
+		// create View, tell it about model
+		View view = new View(model);
+	
+		// create second view ...
+		View2 view2 = new View2(model);
+		
+		// create a layout panel to hold the two views
+		JPanel p = new JPanel(new GridLayout(2,1));
+		frame.getContentPane().add(p);
+
+		// add views (each view is a JPanel)
+		p.add(view);
+		p.add(view2);
+		
+		// create the window
+		frame.setPreferredSize(new Dimension(300,300));
+		frame.pack();
+		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		frame.setVisible(true);
+	} 
+}

java/3-0-MVC/hellomvc3b/Model.java

+import java.util.ArrayList;
+
+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+// View interface
+interface IView {
+	public void updateView();
+}
+
+public class Model {	
+	
+	// the data in the model, just a counter
+	private int counter;	
+	// all views of this model
+	private ArrayList<IView> views = new ArrayList<IView>();
+
+	// set the view observer
+	public void addView(IView view) {
+		views.add(view);
+		// update the view to current state of the model
+		view.updateView();
+	}
+	
+	public int getCounterValue() {
+		return counter;
+	}
+	
+	public void incrementCounter() {
+		if (counter < 5) {
+			counter++;
+			System.out.println("Model: increment counter to " + counter);
+			notifyObservers();
+		}
+	} 	
+	
+	// notify the IView observer
+	private void notifyObservers() {
+			for (IView view : this.views) {
+				System.out.println("Model: notify View");
+				view.updateView();
+			}
+	}
+}

java/3-0-MVC/hellomvc3b/View.java

+// HelloMVC: a simple MVC example
+// the model is just a counter
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.event.*;
+
+class View extends JPanel  {
+
+	// the view's main user interface
+	private JButton button;
+
+	// the model that this view is showing
+	private Model model;
+
+
+	public View(Model model) {
+		
+		// create the view UI
+		button = new JButton("?");
+		button.setMaximumSize(new Dimension(100, 50));
+		button.setPreferredSize(new Dimension(100, 50));
+		// a GridBagLayout with default constraints centres
+		// the widget in the window
+		this.setLayout(new GridBagLayout());
+		this.add(button, new GridBagConstraints());
+
+		// set the model
+		this.model = model;
+
+		// anonymous class acts as model listener
+		this.model.addView(new IView() {
+			public void updateView() {
+				System.out.println("View: updateView");
+				button.setText(Integer.toString(model.getCounterValue()));
+			}
+		});
+
+
+		// setup the event to go to the "controller"
+		// (this anonymous class is essentially the controller)
+		button.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent e) {
+				model.incrementCounter();
+			}
+		});
+	}
+
+
+}

java/3-0-MVC/hellomvc3b/View2.java

+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.FlowLayout;
+import java.awt.Color;
+import java.awt.event.*;
+import java.util.*;
+
+class View2 extends JPanel {
+
+	// the model that this view is showing
+	private Model model;
+	private JLabel label = new JLabel();
+
+	View2(Model model) {
+		// create UI
+		setBackground(Color.WHITE);
+		setLayout(new FlowLayout(FlowLayout.LEFT));
+
+		// set the model
+		this.model = model;
+
+		// anonymous class acts as model listener
+		this.model.addView(new IView() {
+			public void updateView() {
+				System.out.println("View2: updateView");
+				// just displays an 'X' for each counter value
+				String s = "";
+				for (int i=0; i< model.getCounterValue(); i++) s = s + "X";
+				label.setText(s);
+			}
+		});		
+			
+		// setup the event to go to the "controller"
+		// (this anonymous class is essentially the controller)		
+		addMouseListener(new MouseAdapter() {
+				public void mouseClicked(MouseEvent e) {
+					model.incrementCounter();
+				}
+		});
+
+		this.add(this.label);
+	}
+
+}

java/3-0-MVC/hellomvc3b/makefile

+# super simple makefile
+# call it using 'make NAME=name_of_code_file_without_extension'
+# (assumes a .java extension)
+NAME = "Main"
+
+all:
+	@echo "Compiling..."
+	javac *.java
+
+run: all
+	@echo "Running..."
+	java $(NAME)
+
+clean:
+	rm -rf *.class

java/3-0-MVC/hellomvc4/Main.java

+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+/**
+ *  Two views with integrated controllers.  Uses java.util.Observ{er, able} instead
+ *  of custom IView.
+ */
+
+import javax.swing.*;
+import java.awt.Dimension;
+import java.awt.GridLayout;
+import java.awt.event.*;	
+
+public class Main {
+
+	public static void main(String[] args){	
+		JFrame frame = new JFrame("HelloMVC4");
+		
+		// create Model and initialize it
+		Model model = new Model();
+		
+		// create View, tell it about model (and controller)
+		View view = new View(model);
+		// tell Model about View. 
+		model.addObserver(view);
+		
+		// create second view ...
+		View2 view2 = new View2(model);
+		model.addObserver(view2);
+		
+		// let all the views know that they're connected to the model
+		model.notifyObservers();
+		
+		// create a layout panel to hold the two views
+		JPanel p = new JPanel(new GridLayout(2,1));
+		frame.getContentPane().add(p);
+
+		// add views (each view is a JPanel)
+		p.add(view);
+		p.add(view2);
+		
+		// setup window
+		frame.setPreferredSize(new Dimension(300,300));
+		frame.pack();
+		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		frame.setVisible(true);
+	} 
+}

java/3-0-MVC/hellomvc4/Model.java

+import java.util.Observable;
+
+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+public class Model extends Observable {	
+	// the data in the model, just a counter
+	private int counter;	
+	
+	Model() {
+		setChanged();
+	}
+	
+	public int getCounterValue() {
+		return counter;
+	}
+	
+	public void incrementCounter() {
+		if (counter < 5) {
+			counter++;
+			System.out.println("Model: increment counter to " + counter);
+			setChanged();
+			notifyObservers();
+		}
+	} 	
+}

java/3-0-MVC/hellomvc4/View.java

+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.event.*;	
+import java.util.Observable;
+import java.util.Observer;
+
+class View extends JPanel implements Observer {
+
+	// the view's main user interface
+	private JButton button; 
+	
+	// the model that this view is showing
+	private Model model;
+	
+	View(Model model) {
+		
+		// create the view UI
+		button = new JButton("?");
+		button.setMaximumSize(new Dimension(100, 50));
+		button.setPreferredSize(new Dimension(100, 50));
+
+		// a GridBagLayout with default constraints centres
+		// the widget in the window
+		this.setLayout(new GridBagLayout());
+		this.add(button, new GridBagConstraints());
+		
+		// set the model 
+		this.model = model;
+		
+		// setup the event to go to the "controller"
+		// (this anonymous class is essentially the controller)
+		button.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent e) {
+				model.incrementCounter();
+			}
+		});	
+	} 
+
+	// Observer interface 
+	@Override
+	public void update(Observable arg0, Object arg1) {
+		System.out.println("View: update");
+		button.setText(Integer.toString(model.getCounterValue()));		
+	}
+} 

java/3-0-MVC/hellomvc4/View2.java

+// HelloMVC: a simple MVC example
+// the model is just a counter 
+// inspired by code by Joseph Mack, http://www.austintek.com/mvc/
+
+import javax.swing.*;
+import java.awt.FlowLayout;
+import java.awt.Color;
+import java.awt.event.*;
+import java.util.*;
+
+class View2 extends JPanel implements Observer {
+
+	// the model that this view is showing
+	private Model model;
+	private JLabel label = new JLabel();
+
+	View2(Model model) {
+		
+		// create UI
+		setBackground(Color.WHITE);
+		setLayout(new FlowLayout(FlowLayout.LEFT));
+		this.add(this.label);
+
+		// set the model
+		this.model = model;
+		
+		// setup the event to go to the "controller"
+		// (this anonymous class is essentially the controller)		
+		addMouseListener(new MouseAdapter() {
+				public void mouseClicked(MouseEvent e) {
+					model.incrementCounter();
+				}
+		});
+
+	}
+
+	// Observer interface 
+	@Override
+	public void update(Observable o, Object arg) {
+		System.out.println("View2: updateView");
+		// just displays an 'X' for each counter value
+		String s = "";
+		for (int i=0; i<this.model.getCounterValue(); i++) s = s + "X";
+		this.label.setText(s);
+	}
+}

java/3-0-MVC/hellomvc4/makefile

+# super simple makefile
+# call it using 'make NAME=name_of_code_file_without_extension'
+# (assumes a .java extension)
+NAME = "Main"
+
+all:
+	@echo "Compiling..."
+	javac *.java
+
+run: all
+	@echo "Running..."
+	java $(NAME)
+
+clean:
+	rm -rf *.class