Basic bean config

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

@@ -1,21 +1,17 @@
 package be.syntra;
 
+import be.syntra.common.AppConfig;
 import be.syntra.cowsay.*;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 
 import java.util.Scanner;
 
 public class App {
 
   public static void main(String[] args) {
-    /**
-     * Dependency Injection is a technique of creating software in which objects do not create their dependencies on itself.
-     * instead objects declare dependencies that they need and it an external object or framework to provide
-     * concrete dependencies to objects
-     */
 
-    CowSay cowSay = new DragonCowSay();
-    QuoteDao quoteDao = new QuoteDaoMysql();
-    cowSay.setQuoteDao(quoteDao);
+    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
+    CowSay cowSay = context.getBean("cowSay", CowSay.class);
     cowSay.showQuote();
 
     Scanner in = new Scanner(System.in);
@@ -32,5 +28,6 @@ public class App {
         System.out.println("Please enter y/n");
       }
     }
+    context.close();
   }
 }

src/main/java/be/syntra/ApplicationContext.java

@@ -0,0 +1,4 @@
+package be.syntra;
+
+public class ApplicationContext {
+}

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

@@ -0,0 +1,25 @@
+package be.syntra.common;
+
+import be.syntra.cowsay.CowSay;
+import be.syntra.cowsay.OriginalCowSay;
+import be.syntra.cowsay.QuoteDao;
+import be.syntra.cowsay.QuoteDaoDummy;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AppConfig {
+
+    //define bean for Dao
+    @Bean
+    public QuoteDao quoteDao() { //-> the method name is the "Bean id"
+        return new QuoteDaoDummy();
+    }
+
+    //define Bean for swim coach AND dependency injection
+    @Bean
+    public CowSay cowSay() { //-> the method name is the "Bean id"
+        return new OriginalCowSay(quoteDao());
+    }
+
+}

src/main/java/be/syntra/cowsay/CowSay.java

@@ -4,6 +4,5 @@ public interface CowSay {
     void showQuote();
     void voteUp();
     void voteDown();
-    void setQuoteDao(QuoteDao quoteDao);
 }
 

src/main/java/be/syntra/cowsay/OriginalCowSay.java

@@ -5,10 +5,11 @@ public class OriginalCowSay implements CowSay {
     QuoteDao quoteDao;
     Quote quote;
 
-    public void setQuoteDao(QuoteDao quoteDao) {
+    public OriginalCowSay(QuoteDao quoteDao) {
         this.quoteDao = quoteDao;
     }
 
+
     @Override
     public void showQuote() {
         quote = quoteDao.getRandomQuote();