XML-based configuration replaced with Java Config.

Author: TSobala

injecting-beans/README.txt

@@ -0,0 +1,2 @@
+If you are interested in XML-based configuration, you can see all the injections done with this approach by
+just using Spring-Module.xml in App.java (It's commented by default).

injecting-beans/src/main/java/com/baeldung/App.java

@@ -1,15 +1,18 @@
 package com.baeldung;
 
+import com.baeldung.config.AppConfig;
 import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 
 /**
  * Application presenting various possibilities of bean injections in Spring.
  */
 public class App {
     public static void main(String[] args) {
-        ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Module.xml");
+//        ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Module.xml");
 
+        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
         Computer obj = (Computer) context.getBean("computer");
         obj.print();
     }

injecting-beans/src/main/java/com/baeldung/Computer.java

@@ -15,14 +15,11 @@ public class Computer {
     private Screen screen;
     private OperatingSystem operatingSystem;
 
-    public Computer(Processor processor) {
-        this.processor = processor;
-    }
-
     @Autowired
-    public Computer(OperatingSystem operatingSystem, Processor processor) {
+    public Computer(Processor processor, OperatingSystem operatingSystem, HardDisk hardDisk) {
         this.operatingSystem = operatingSystem;
         this.processor = processor;
+        this.hardDisk = hardDisk;
     }
 
     public void setHardDisk(HardDisk hardDisk) {
@@ -35,11 +32,11 @@ public void setScreen(Screen screen) {
     }
 
     public void print() {
-        System.out.println("Injected processor by constructor injection: " + processor.getName());
-        System.out.println("Injected hard disk by setter injection: " + hardDisk.getName());
-        System.out.println("Injected graphics card with field annotation: " + graphicsCard.getName());
-        System.out.println("Injected screen with setter annotation: " + screen.getSize());
-        System.out.println("Injected operating system name with constructor annotation: " + operatingSystem.getName());
+        System.out.println("Injected processor: " + processor.getName());
+        System.out.println("Injected hard disk: " + hardDisk.getName());
+        System.out.println("Injected graphics card: " + graphicsCard.getName());
+        System.out.println("Injected screen size: " + screen.getSize());
+        System.out.println("Injected operating system name: " + operatingSystem.getName());
     }
 
     @Override

injecting-beans/src/main/java/com/baeldung/config/AppConfig.java

@@ -0,0 +1,54 @@
+package com.baeldung.config;
+
+import com.baeldung.Computer;
+import com.baeldung.model.*;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Beans configuration.
+ */
+@Configuration
+public class AppConfig {
+
+    @Bean(name = "computer")
+    public Computer computer() {
+        return new Computer(processor(), operatingSystem(), hardDisk());
+    }
+
+    @Bean(name = "processor")
+    public Processor processor() {
+        Processor processor = new Processor();
+        processor.setName("Intel Core i7-6650U");
+        return processor;
+    }
+
+    @Bean(name = "hardDisk")
+    public HardDisk hardDisk() {
+        HardDisk hardDisk = new HardDisk();
+        hardDisk.setName("SSD TRANSCEND MTS400");
+        return hardDisk;
+    }
+
+    @Bean(name = "graphicsCard")
+    public GraphicsCard graphicsCard() {
+        GraphicsCard graphicsCard = new GraphicsCard();
+        graphicsCard.setName("NVIDIA GeForce GTX980M");
+        return graphicsCard;
+    }
+
+    @Bean(name = "operatingSystem")
+    public OperatingSystem operatingSystem() {
+        OperatingSystem operatingSystem = new OperatingSystem();
+        operatingSystem.setName("Windows 10 Pro");
+        return operatingSystem;
+    }
+
+    @Bean(name = "screen")
+    public Screen screen() {
+        Screen screen = new Screen();
+        screen.setSize("17 inches");
+        return screen;
+    }
+
+}

injecting-beans/src/main/java/com/baeldung/model/GraphicsCard.java

@@ -4,7 +4,10 @@
  * Model for graphics card.
  */
 public class GraphicsCard {
-    String name;
+    private String name;
+
+    public GraphicsCard() {
+    }
 
     public String getName() {
         return name;

injecting-beans/src/main/java/com/baeldung/model/OperatingSystem.java

@@ -6,6 +6,9 @@
 public class OperatingSystem {
     private String name;
 
+    public OperatingSystem(){
+    }
+
     public String getName() {
         return name;
     }

injecting-beans/src/main/java/com/baeldung/model/Processor.java

@@ -6,6 +6,9 @@
 public class Processor {
     private String name;
 
+    public Processor() {
+    }
+
     public String getName() {
         return name;
     }

injecting-beans/src/main/java/com/baeldung/model/Screen.java

@@ -4,9 +4,11 @@
  * Model for Screen.
  */
 public class Screen {
-
     private String size;
 
+    public Screen() {
+    }
+
     public String getSize() {
         return size;
     }