spring core - apply spring(spring container)

spring-core/basic/src/main/java/com/example/basic/AppConfig.java

@@ -2,28 +2,38 @@ package com.example.basic;
 
 import com.example.basic.discount.DiscountPolicy;
 import com.example.basic.discount.FixDiscountPolicy;
+import com.example.basic.discount.RateDiscountPolicy;
 import com.example.basic.member.MemberRepository;
 import com.example.basic.member.MemberService;
 import com.example.basic.member.MemberServiceImpl;
 import com.example.basic.member.MemoryMemberRepository;
 import com.example.basic.order.OrderService;
 import com.example.basic.order.OrderServiceImpl;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 
+@Configuration
 public class AppConfig {
 
+    @Bean
     public MemberService memberService() {
         return new MemberServiceImpl(memberRepository());
     }
 
-    private MemberRepository memberRepository() {
+    @Bean
+    public MemberRepository memberRepository() {
         return new MemoryMemberRepository();
     }
 
+    @Bean
     public OrderService orderService() {
         return new OrderServiceImpl(memberRepository(), discountPolicy());
     }
 
-    private DiscountPolicy discountPolicy() {
-        return new FixDiscountPolicy();
+    @Bean
+    public DiscountPolicy discountPolicy() {
+//        return new FixDiscountPolicy();
+        return new RateDiscountPolicy();
     }
+
 }

spring-core/basic/src/main/java/com/example/basic/MemberApp.java

@@ -3,12 +3,18 @@ package com.example.basic;
 import com.example.basic.member.Grade;
 import com.example.basic.member.Member;
 import com.example.basic.member.MemberService;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 
 public class MemberApp {
 
     public static void main(String[] args) {
-        AppConfig appConfig = new AppConfig();
-        MemberService memberService = appConfig.memberService();
+//        AppConfig appConfig = new AppConfig();
+//        MemberService memberService = appConfig.memberService();
+
+        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
+        MemberService memberService = applicationContext.getBean("memberService", MemberService.class);
+
         Member member = new Member(1L, "memberA", Grade.VIP);
         memberService.join(member);
 

spring-core/basic/src/main/java/com/example/basic/OrderApp.java

@@ -5,13 +5,20 @@ import com.example.basic.member.Member;
 import com.example.basic.member.MemberService;
 import com.example.basic.order.Order;
 import com.example.basic.order.OrderService;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 
 public class OrderApp {
 
     public static void main(String[] args) {
-        AppConfig appConfig = new AppConfig();
-        MemberService memberService = appConfig.memberService();
-        OrderService orderService = appConfig.orderService();
+//        AppConfig appConfig = new AppConfig();
+//        MemberService memberService = appConfig.memberService();
+//        OrderService orderService = appConfig.orderService();
+
+        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
+
+        MemberService memberService = applicationContext.getBean("memberService", MemberService.class);
+        OrderService orderService = applicationContext.getBean("orderService", OrderService.class);
 
         Long memberId = 1L;
         Member member = new Member(memberId, "memberA", Grade.VIP);