Compositions

Here's a simple example of using an interface, composition, and mixin behavior to change a class dynamically at runtime. - %

package cruft;

import javax.swing.JOptionPane;

public class CompositionExample implements Mixin

{

private Mixin composition;

private static final String DEFAULT_MESSAGE = "All mixed up";

public static void main(String[] args)

{

CompositionExample example = new CompositionExample();

String message = ((args.length > 0) ? args[0] : DEFAULT_MESSAGE);

example.setComposition(

new Mixin()

{

public void doIt(String message)

{

System.out.println(message);

}

}

);

example.doIt(message);

example.setComposition(

new Mixin()

{

public void doIt(String message)

{

JOptionPane.showConfirmDialog(null, message, message, JOptionPane.OK_OPTION);

}

}

);

example.doIt(message);

}

public void setComposition(Mixin composition)

{

this.composition = composition;

}

public void doIt(String message)

{

composition.doIt(message);

}

}

interface Mixin

{

void doIt(String message);

}

duffymoa at 2007-7-8 23:08:31 >