69 lines
2.8 KiB
Java
69 lines
2.8 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Created by Alexis on 28-Apr-17. With Marker interface idea is to make empty interface and extend
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* it. Basically it is just to identify the special objects from normal objects. Like in case of
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* serialization , objects that need to be serialized must implement serializable interface (it is
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* empty interface) and down the line writeObject() method must be checking if it is a instance of
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* serializable or not.
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*
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* <p>Marker interface vs annotation Marker interfaces and marker annotations both have their uses,
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* neither of them is obsolete or always better then the other one. If you want to define a type
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* that does not have any new methods associated with it, a marker interface is the way to go. If
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* you want to mark program elements other than classes and interfaces, to allow for the possibility
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* of adding more information to the marker in the future, or to fit the marker into a framework
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* that already makes heavy use of annotation types, then a marker annotation is the correct choice
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*/
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public class App {
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/**
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* Program entry point.
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*
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* @param args command line args
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*/
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public static void main(String[] args) {
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final Logger logger = LoggerFactory.getLogger(App.class);
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var guard = new Guard();
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var thief = new Thief();
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//noinspection ConstantConditions
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if (guard instanceof Permission) {
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guard.enter();
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} else {
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logger.info("You have no permission to enter, please leave this area");
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}
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//noinspection ConstantConditions
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if (thief instanceof Permission) {
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thief.doNothing();
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} else {
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thief.doNothing();
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}
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}
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}
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