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# 스프링 컨테이너 생성

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ApplicationContext applicationContext \n      = new AnnotationConfigApplicationContext(AppConfig.class);
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# 스프링 빈 등록

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AnnotationConfigApplicationContext acExtends = \n          new AnnotationConfigApplicationContext(TestConfig.class);\n  @Configuration\n  static class TestConfig {\n    @Bean\n    public DataPolicy rateDataPolicy() {\n      return new RateDataPolicy();\n    }\n    @Bean\n    public DataPolicy fixDataPolicy() {\n      return new FixDataPolicy();\n    }\n  }\n\n  @Test\n  @DisplayName(\"부모 타입으로 조회시, 자식이 둘 이상 있으면, 중복 오류가 발생한다.\")\n  void findBeanByParentTypeDuplicate() {\n    assertThrows(NoUniqueBeanDefinitionException.class,\n      () -> acExtends.getBean(DataPolicy.class));\n  }\n\n  @Test\n  @DisplayName(\"부모 타입으로 조회시, 자식이 둘 이상 있으면, 빈 이름을 지정하면 된다.\")\n  void findBeanByParentTypeBeanName() {\n    RateDataPolicy rateDataPolicy = acExtends.getBean(\"rateDataPolicy\", RateDataPolicy.class);\n    assertThat(rateDataPolicy).isInstanceOf(RateDataPolicy.class);\n  }\n\n  @Test\n  @DisplayName(\"특정 하위 타입으로 조회\")\n  void findBeanBySubType() {\n    RateDataPolicy rateDataPolicy = acExtends.getBean(RateDataPolicy.class);\n    assertThat(rateDataPolicy).isInstanceOf(RateDataPolicy.class);\n  }\n\n  @Test\n  @DisplayName(\"부모 타입으로 모두 조회하기\")\n  void findAllBeanByParentType() {\n    Map<String, DataPolicy> beansOfType = acExtends.getBeansOfType(DataPolicy.class);\n    assertThat(beansOfType.size()).isEqualTo(2);\n\n    for (String key : beansOfType.keySet()) {\n      System.out.println(\"key = \" + key + \" value = \" + beansOfType.get(key));\n    }\n  }
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