Merge pull request #17531 from ameyaoak/master

BAEL-8458: What's the difference between interface and @interface in Java

Author: vinipx

core-java-modules/core-java-interface/README.md

@@ -0,0 +1 @@
+Code for article: https://drafts.baeldung.com/interface-vs-interface/

core-java-modules/core-java-interface/pom.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>CoreJavaInterface</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

core-java-modules/core-java-interface/src/main/java/org/annotations/Review.java

@@ -0,0 +1,13 @@
+package org.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.METHOD})
+public @interface Review {
+    String reviewer();
+    String date() default "";
+}

core-java-modules/core-java-interface/src/main/java/org/annotations/ReviewUsage.java

@@ -0,0 +1,10 @@
+package org.annotations;
+
+public class ReviewUsage {
+
+    @Review(reviewer = "Natasha", date = "2024-08-24")
+    public String service() {
+        return "Some logic here";
+    }
+
+}

core-java-modules/core-java-interface/src/main/java/org/interfaces/Animal.java

@@ -0,0 +1,6 @@
+package org.interfaces;
+
+public interface Animal {
+    String eat();
+    String sleep();
+}

core-java-modules/core-java-interface/src/main/java/org/interfaces/Dog.java

@@ -0,0 +1,13 @@
+package org.interfaces;
+
+public class Dog implements Animal {
+    @Override
+    public String eat() {
+        return "Dog is eating";
+    }
+
+    @Override
+    public String sleep() {
+        return "Dog is sleeping";
+    }
+}

core-java-modules/core-java-interface/src/test/java/org/annotations/ReviewUsageTest.java

@@ -0,0 +1,23 @@
+package org.annotations;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class ReviewUsageTest {
+
+    @Test
+    public void whenMethodAnnotatedWithReviewAnnotationIsCalled_ThenReviewerAndReviewDateIsPopulated()
+            throws NoSuchMethodException {
+        ReviewUsage reviewUsage = new ReviewUsage();
+
+        Review review = reviewUsage
+                .getClass()
+                .getDeclaredMethod("service")
+                .getAnnotation(Review.class);
+
+        assertEquals("Natasha", review.reviewer());
+        assertEquals("2024-08-24", review.date());
+    }
+
+}

core-java-modules/core-java-interface/src/test/java/org/interfaces/DogTest.java

@@ -0,0 +1,26 @@
+package org.interfaces;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class DogTest {
+
+    @Test
+    public void givenDogIsAAnimal_whenEatMethodIsCalled_ThenAssertIfDogIsEating() {
+        Dog dog = new Dog();
+
+        String response = dog.eat();
+
+        assertEquals("Dog is eating", response);
+    }
+
+    @Test
+    public void givenDogIsAAnimal_whenSleepMethodIsCalled_ThenAssertIfDogIsSleeping() {
+        Dog dog = new Dog();
+
+        String response = dog.sleep();
+
+        assertEquals("Dog is sleeping", response);
+    }
+}