Add bean overriding example

Author: tboychuk

bean-overriding/pom.xml

@@ -0,0 +1,15 @@
+<?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">
+    <parent>
+        <artifactId>spring-framework-tutorial</artifactId>
+        <groupId>com.bobocode</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>bean-overriding</artifactId>
+
+
+</project>

bean-overriding/src/main/java/com/bobocode/BeanOverridingExample.java

@@ -0,0 +1,16 @@
+package com.bobocode;
+
+
+import com.bobocode.configs.MainConfig;
+import com.bobocode.service.TalkingService;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+public class BeanOverridingExample {
+    public static void main(String[] args) {
+        ApplicationContext context = new AnnotationConfigApplicationContext(MainConfig.class);
+
+        TalkingService talkingService = context.getBean(TalkingService.class);
+        System.out.println(talkingService.saySomething());
+    }
+}

bean-overriding/src/main/java/com/bobocode/configs/AdditionalConfig.java

@@ -0,0 +1,14 @@
+package com.bobocode.configs;
+
+import com.bobocode.service.TalkingService;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class AdditionalConfig {
+
+    @Bean("talkingService")
+    public TalkingService pythonFanService() {
+        return () -> "Python is awesome!";
+    }
+}

bean-overriding/src/main/java/com/bobocode/configs/MainConfig.java

@@ -0,0 +1,16 @@
+package com.bobocode.configs;
+
+import com.bobocode.service.TalkingService;
+import org.springframework.context.annotation.*;
+
+@Configuration
+@ComponentScan(basePackages = "com.bobocode.service")
+@ImportResource("classpath:application-context.xml")
+@Import(AdditionalConfig.class)
+public class MainConfig {
+
+    @Bean("talkingService")
+    public TalkingService javaFanService() {
+        return () -> "Java is the best!";
+    }
+}

bean-overriding/src/main/java/com/bobocode/service/TalkingService.java

@@ -0,0 +1,6 @@
+package com.bobocode.service;
+
+
+public interface TalkingService {
+    String saySomething();
+}

bean-overriding/src/main/java/com/bobocode/service/impl/CFanService.java

@@ -0,0 +1,12 @@
+package com.bobocode.service.impl;
+
+import com.bobocode.service.TalkingService;
+import org.springframework.stereotype.Service;
+
+@Service("talkingService")
+public class CFanService implements TalkingService {
+    @Override
+    public String saySomething() {
+        return "I like C, and I don't care...";
+    }
+}

bean-overriding/src/main/java/com/bobocode/service/impl/PhpFanService.java

@@ -0,0 +1,12 @@
+package com.bobocode.service.impl;
+
+
+import com.bobocode.service.TalkingService;
+
+public class PhpFanService implements TalkingService {
+
+    @Override
+    public String saySomething() {
+        return "Php is still good :D";
+    }
+}

bean-overriding/src/main/resources/application-context.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+    <bean id="talkingService" class="com.bobocode.service.impl.PhpFanService"/>
+</beans>

pom.xml

@@ -17,6 +17,7 @@
         <module>mvc-basics</module>
         <module>rest-basics</module>
         <module>jpa-tx-management</module>
+        <module>bean-overriding</module>
     </modules>
 
     <properties>