Constructor Based Injection

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

@@ -4,14 +4,13 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.stereotype.Component;
 
-@Component("cowSay")
+@Component
 public class DragonCowSay implements CowSay {
     QuoteDao quoteDao;
     Quote quote;
 
     @Autowired
-    @Qualifier("activeQuoteDao")
-    public void setQuoteDao(QuoteDao quoteDao) {
+    public DragonCowSay (@Qualifier("activeQuoteDao") QuoteDao quoteDao) {
         this.quoteDao = quoteDao;
     }
 

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

@@ -4,14 +4,13 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.stereotype.Component;
 
-@Component
+@Component("cowSay")
 public class OriginalCowSay implements CowSay {
     QuoteDao quoteDao;
     Quote quote;
 
     @Autowired
-    @Qualifier("activeQuoteDao")
-    public void setQuoteDao(QuoteDao quoteDao) {
+    public OriginalCowSay (@Qualifier("activeQuoteDao") QuoteDao quoteDao) {
         this.quoteDao = quoteDao;
     }