Object-Oriented Techniques - Java - page 322

public public interface interface View View {

void void displayMessage ();

}

The implementations of these are not shown, because they're so trivial, but they are online.
The Controller in this example is a main program, no interface needed. First, a version of the
main program not using Dependency Injection. Obviously the View requires the Model, to
get the data to display:

ControllerTightlyCoupled.java

public public class class ControllerTightlyCoupled ControllerTightlyCoupled {

public public static void main ( String [] args ) {

Model m = new

static void

new SimpleModel ();
View v = new new ConsoleViewer ();

(( ConsoleViewer ) v ). setModel ( m );
v . displayMessage ();

}

}

Here we have four tasks to undertake:

1. Create the Model.

2. Create the View.

3. Tie the Model into the View.

4. Ask the View to display some data.

Now a version using Dependency Injection:

Spring Controller.java

public public class class Controller Controller {

public public static void main ( String [] args ) {

ApplicationContext ctx =
new

static void

new AnnotationConfigApplicationContext ( "di.spring" );
View v = ctx . getBean ( "myView" , View . class );