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public class UtilityClass {
  // Supress default constructor for noninstantiablity
  private UtilityClass() {
    throw new AssertionError();
  }
}


public abstract class AnnotatedElementUtils {
    public AnnotatedElementUtils() {
    }
    ~~~
}

public abstract class AnnotationConfigUtils {
    public static final String CONFIGURATION_ANNOTATION_PROCESSOR_BEAN_NAME = "org.springframework.context.annotation.internalConfigurationAnnotationProcessor";
    public static final String CONFIGURATION_BEAN_NAME_GENERATOR = "org.springframework.context.annotation.internalConfigurationBeanNameGenerator";
    public static final String AUTOWIRED_ANNOTATION_PROCESSOR_BEAN_NAME = "org.springframework.context.annotation.internalAutowiredAnnotationProcessor";
    /** @deprecated */
    @Deprecated
    public static final String REQUIRED_ANNOTATION_PROCESSOR_BEAN_NAME = "org.springframework.context.annotation.internalRequiredAnnotationProcessor";
    public static final String COMMON_ANNOTATION_PROCESSOR_BEAN_NAME = "org.springframework.context.annotation.internalCommonAnnotationProcessor";
    public static final String PERSISTENCE_ANNOTATION_PROCESSOR_BEAN_NAME = "org.springframework.context.annotation.internalPersistenceAnnotationProcessor";
    private static final String PERSISTENCE_ANNOTATION_PROCESSOR_CLASS_NAME = "org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor";
    public static final String EVENT_LISTENER_PROCESSOR_BEAN_NAME = "org.springframework.context.event.internalEventListenerProcessor";
    public static final String EVENT_LISTENER_FACTORY_BEAN_NAME = "org.springframework.context.event.internalEventListenerFactory";
    private static final boolean jsr250Present;
    private static final boolean jpaPresent;

    public AnnotationConfigUtils() {
    }
    ~~~
}

item4 - private 생성자로 noninstantibillity를 강제할 것

private 생성자로 noninstantibillity를 강제할 것

과연 다른 유틸리티 클래스는 저 방식을 적용하고 있을까?