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All without Readme and pumlid
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‎marker/etc/MarkerDiagram.png‎

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‎marker/etc/MarkerDiagram.ucls‎

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<?xml version="1.0" encoding="UTF-8"?>
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<class-diagram version="1.2.0" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true"
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realizations="true" associations="true" dependencies="false" nesting-relationships="true" router="FAN">
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<class id="1" language="java" name="Guard" project="marker" file="/marker/src/main/java/Guard.java" binary="false"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="416" y="348"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="true" package="true" protected="true" private="true" static="true"/>
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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</class>
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<interface id="2" language="java" name="Permission" project="marker" file="/marker/src/main/java/Permission.java"
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binary="false" corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="261" y="175"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="true" package="true" protected="true" private="true" static="true"/>
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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</interface>
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<class id="3" language="java" name="Thief" project="marker" file="/marker/src/main/java/Thief.java" binary="false"
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corner="BOTTOM_RIGHT">
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<position height="-1" width="-1" x="236" y="355"/>
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="true" package="true" protected="true" private="true" static="true"/>
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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</class>
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<realization id="4">
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<end type="SOURCE" refId="1"/>
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<end type="TARGET" refId="2"/>
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</realization>
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<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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sort-features="false" accessors="true" visibility="true">
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<attributes public="true" package="true" protected="true" private="true" static="true"/>
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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</classifier-display>
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<association-display labels="true" multiplicity="true"/>
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</class-diagram>

‎marker/pom.xml‎

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<modelVersion>4.0.0</modelVersion>
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<artifactId>marker</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>RELEASE</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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</dependency>
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</dependencies>
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</project>

‎marker/src/main/java/App.java‎

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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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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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System.out.println("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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}

‎marker/src/main/java/Thief.java‎

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/**
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* Created by Alexis on 02-May-17.
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*/
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public class Thief {
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protected static void steal() {
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System.out.println("Steal valuable items");
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}
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protected static void doNothing() {
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System.out.println("Pretend nothing happened and just leave");
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}
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}

‎marker/src/test/java/AppTest.java‎

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/**
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* Created by Alexis on 01-May-17.
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*/
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import org.junit.Test;
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/**
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* Application test
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*/
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public class AppTest {
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@Test
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public void test() {
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String[] args = {};
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App.main(args);
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}
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}

‎marker/src/test/java/GuardTest.java‎

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import org.junit.Test;
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import static org.hamcrest.CoreMatchers.instanceOf;
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import static org.junit.Assert.assertThat;
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/**
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* Created by Alexis on 02-May-17.
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*/
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public class GuardTest {
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@Test
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public void testGuard() {
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Guard guard = new Guard();
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assertThat(guard, instanceOf(Permission.class));
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}
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}

‎marker/src/test/java/ThiefTest.java‎

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/**
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* Created by Alexis on 02-May-17.
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*/
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import org.junit.Test;
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import static org.junit.Assert.assertFalse;
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public class ThiefTest {
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@Test
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public void testGuard() {
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Thief thief = new Thief();
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assertFalse(thief instanceof Permission);
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}
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}

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