1 files changed, 50 insertions, 0 deletions
diff --git a/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/App.java b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/App.java
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+++ b/spring-framework/04-basic-no-xml-java-configuration/src/main/java/com/example/spring/App.java
@@ -0,0 +1,50 @@
+package com.example.spring;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class App {
+
+	public static void main(String[] args) {
+		@SuppressWarnings("resource")
+		ApplicationContext ctx = new AnnotationConfigApplicationContext(App.class);
+
+		MathsUser mathsUser = ctx.getBean(MathsUser.class);
+
+		mathsUser.doTask();
+	}
+
+	@Bean
+	public Maths maths() {
+		Maths maths = new Maths();
+		maths.setB(100);
+
+		return maths;
+	}
+
+	@Bean
+	public MathsUser mathsUser() {
+		MathsUser mathsUser = new MathsUser();
+
+		/*
+		 * What would the maths() return? Would it be the Spring managed bean or what
+		 * would be returned when the maths() method is directly invoked?
+		 * 
+		 * @Bean can be used with classes annotated with @Component tool.
+		 * 
+		 * In a class annotated with @Configuration, maths() return the Spring managed bean.
+		 *  
+		 * In a class annotated with @Component, what is returned by maths() is not the
+		 * Spring managed bean, but what would be returned when the maths() method is directly invoked.
+		 * 
+		 * For more details, look at the 'Full @Configuration vs “lite” @Bean mode?' description
+		 * found in the 'Core Technologies' section of the Spring Framework Reference documentation.  
+		 */
+		mathsUser.setMaths(maths());
+
+		return mathsUser;
+	}
+}
+\ No newline at end of file