49 lines
1.6 KiB
Java
49 lines
1.6 KiB
Java
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.
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* With Marker interface idea is to make empty interface and extend it.
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* Basically it is just to identify the special objects from normal objects.
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* Like in case of serialization , objects that need to be serialized must implement serializable interface
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* (it is empty interface) and down the line writeObject() method must be checking
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* if it is a instance of serializable or not.
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* <p>
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* Marker interface vs annotation
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* 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* neither of them is obsolete or always better then the other one.
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* If you want to define a type that does not have any new methods associated with it,
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* a marker interface is the way to go.
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* If you want to mark program elements other than classes and interfaces,
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* to allow for the possibility of adding more information to the marker in the future,
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* or to fit the marker into a framework that already makes heavy use of annotation types,
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* 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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Guard guard = new Guard();
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Thief thief = new Thief();
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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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if (thief instanceof Permission) {
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thief.steal();
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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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