spring

pom.xml

@@ -15,6 +15,12 @@
     </properties>
 
     <dependencies>
+        <!-- https://mvnrepository.com/artifact/org.springframework/spring -->
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <version>5.2.13.RELEASE</version>
+        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>

src/main/java/be/syntra/App.java

@@ -1,17 +1,23 @@
 package be.syntra;
 
 
+import be.syntra.common.AppConfig;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
 public class App {
 
-  public static void main(String[] args) {
+    public static void main(String[] args) {
+
+        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
+        Coach coach = context.getBean("coach",Coach.class);
 
-    Coach coach = new SwimCoach();
 
-    //call method from bean
-    System.out.println(coach.getDailyWorkout());
+        //call method from bean
+        System.out.println(coach.getDailyWorkout());
 
-    //get diet recommendation
-    System.out.println(coach.getDailyMeal());
+        //get diet recommendation
+        System.out.println(coach.getDailyMeal());
+        context.close();
+    }
 
-  }
 }

src/main/java/be/syntra/Coach.java

@@ -4,4 +4,4 @@ public interface Coach {
     String getDailyWorkout();
 
     String getDailyMeal();
-}
+}

src/main/java/be/syntra/DietService.java

@@ -1,5 +1,5 @@
 package be.syntra;
 
-interface DietService {
+public interface DietService {
     String getRecommendation();
-}
+}

src/main/java/be/syntra/PaleoService.java

@@ -3,6 +3,6 @@ package be.syntra;
 public class PaleoService implements DietService{
     @Override
     public String getRecommendation() {
-            return "Eat Meat";
+        return "Eat Meat";
     }
-}
+}

src/main/java/be/syntra/SwimCoach.java

@@ -4,7 +4,7 @@ public class SwimCoach implements Coach {
 
     private DietService dietService;
 
-    public SwimCoach() {
+    public SwimCoach(DietService dietService) {
         this.dietService = new VeggieService();
     }
 
@@ -19,4 +19,4 @@ public class SwimCoach implements Coach {
     }
 
 
-}
+}

src/main/java/be/syntra/TennisCoach.java

@@ -5,7 +5,7 @@ public class TennisCoach implements Coach {
 
     private DietService dietService;
 
-    public TennisCoach() {
+    public TennisCoach(DietService dietService) {
         this.dietService = new VeganService();
     }
 

src/main/java/be/syntra/VeggieService.java

@@ -6,4 +6,4 @@ public class VeggieService implements DietService {
     public String getRecommendation() {
         return "Salad and veggie wraps";
     }
-}
+}

src/main/java/be/syntra/common/AppConfig.java

@@ -0,0 +1,23 @@
+package be.syntra.common;
+
+import be.syntra.*;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AppConfig {
+
+
+    @Bean
+    public DietService dietService() { //the method name is the "Bean id"
+        return new VeggieService();
+    }
+
+    //Define Bean for SwimCoach and Dependency Injection
+    @Bean
+    public Coach coach() { //-> the method name is the "Bean id"
+        return new SwimCoach(dietService());
+    }
+
+
+}