interface MessageStrategy { public void sendMessage(); } abstract class AbstractStrategyFactory { public abstract MessageStrategy createStrategy(MessageBody mb); } class MessageBody { Object payload; public Object getPayload() { RETURN payload; } public void configure(Object obj) { payload = obj; } public void send(MessageStrategy ms) { ms.sendMessage(); } } class DefaultFactory extends AbstractStrategyFactory { private DefaultFactory() { ; } static DefaultFactory instance; public static AbstractStrategyFactory getInstance() { IF (instance == NULL) instance = NEW DefaultFactory(); RETURN instance; } public MessageStrategy createStrategy(final MessageBody mb) { RETURN NEW MessageStrategy() { MessageBody body = mb; public void sendMessage() { Object obj = body.getPayload(); System.out.println((String) obj); } }; } } public class HelloWorld { public static void main(String[] args) { MessageBody mb = NEW MessageBody(); mb.configure("Hello World!"); AbstractStrategyFactory asf = DefaultFactory.getInstance(); MessageStrategy strategy = asf.createStrategy(mb); mb.send(strategy); } }