public abstract class AbstractStrategyFactory {
    public abstract MessageStrategy createStrategy(MessageBody mb);
}

public class MessageBody {
    Object payload;
    public Object getPayload() { return payload; }
    public void configure(Object obj) { payload = obj; }
    public void send(MessageStrategy ms) {
        ms.sendMessage();
    }
}

public class DefaultFactory extends AbstractStrategyFactory {
    private DefaultFactory() {}
    static DefaultFactory instance;
    public static AbstractStrategyFactory getInstance() {
        if (null==instance) 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(obj.toString());
            }
        };
    }
}