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Implements Disposable Bean

File: context.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"     "http://www.springframework.org/dtd/spring-beans.dtd"> <beans>    <bean id="numberClass"       class="DisposableBeanNumberClass"/> </beans> File: Main.java import java.util.ArrayList; import java.util.List; import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.core.io.ClassPathResource; public class Main {   public static void main(String[] args) throws Exception {     ConfigurableListableBeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource(         "context.xml"));     DisposableBeanNumberClass numberClass = (DisposableBeanNumberClass) beanFactory         .getBean("numberClass");     beanFactory.destroySingletons();     System.out.println(numberClass.getNumbers());   } } class DisposableBeanNumberClass implements DisposableBean {   private List<String> numbers = new ArrayList<String>();   public DisposableBeanNumberClass() {     this.numbers.add("one");     this.numbers.add("two");     this.numbers.add("three");   }   public List<String> getNumbers() {     return this.numbers;   }   public void destroy() throws Exception {     this.numbers = null;   } }