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App.java

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/**

* The MIT License

* Copyright (c) 2014 Ilkka Seppälä

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

* Created by Alexis on 28-Apr-17.

* With Marker interface idea is to make empty interface and extend it.

* Basically it is just to identify the special objects from normal objects.

* Like in case of serialization , objects that need to be serialized must implement serializable interface

* (it is empty interface) and down the line writeObject() method must be checking

* if it is a instance of serializable or not.

* <p>

* Marker interface vs annotation

* Marker interfaces and marker annotations both have their uses,

* neither of them is obsolete or always better then the other one.

* If you want to define a type that does not have any new methods associated with it,

* a marker interface is the way to go.

* If you want to mark program elements other than classes and interfaces,

* to allow for the possibility of adding more information to the marker in the future,

* or to fit the marker into a framework that already makes heavy use of annotation types,

* then a marker annotation is the correct choice

*/

public class App {

/**

* Program entry point

*

* @param args command line args

*/

public static void main(String[] args) {

final Logger logger = LoggerFactory.getLogger(App.class);

Guard guard = new Guard();

Thief thief = new Thief();

if (guard instanceof Permission) {

guard.enter();

} else {

logger.info("You have no permission to enter, please leave this area");

}

if (thief instanceof Permission) {

thief.steal();

} else {

thief.doNothing();

}

}

}