Java2014_NestedLocalAnonymousLambdaEvents

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package nestedlocalanonymouslambdaevents;

/**
 *
 * @author Kristiqn
 */
public class NestedLocalAnonymousLambdaEvents {

    private static class NestedListener implements MyEventHandler{
        @Override
        public void happend(Object sender) {
            System.out.println("Something happaned.Event handler in my Nested class.");
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // 0. conventional approach with a class
        Notifier notifier = new Notifier();
        notifier.doSomething();
        notifier.onSomething = new Listener();
        notifier.doSomething();

        // 1. Nested class
        notifier.onSomething = new NestedListener();
        notifier.doSomething();

        // 2. Local class
        class LocalListener implements MyEventHandler {
            @Override
            public void happend(Object sender) {
                System.out.println("Something happaned.Event handler in my Local class.");
            }
        }
        notifier.onSomething = new LocalListener();
        notifier.doSomething();

        // 3. Anonymous class
        notifier.onSomething = new MyEventHandler() {
            @Override
            public void happend(Object sender) {
                System.out.println("Somethign happaned. Event handler in my anonymous class.");
            }
        };
        notifier.doSomething();

        // 4. Lambda
        notifier.onSomething =
                (Object object) -> System.out.println("Somethign happaned. Event handler lambda expression");
        notifier.doSomething();
    }
}