3-36使用singletons和prototypes
测试类：

package com.apress.prospring2.ch03.beanfactory;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.ClassPathResource;/** * @author janm */public class ScopeDemo {    private static void compare(final BeanFactory factory, final String beanName) {        String b1 = (String)factory.getBean(beanName);        String b2 = (String)factory.getBean(beanName);        System.out.println("Bean b1=" + b1 + ", b2=" + b2);        System.out.println("Same?  " + (b1 == b2));        System.out.println("Equal? " + (b1.equals(b2)));    }    public static void main(String[] args) {        BeanFactory factory = new XmlBeanFactory(                            new ClassPathResource("/META-INF/spring/beanscopedemo1-context.xml"));        compare(factory, "singleMe");        compare(factory, "prototypeMe");    }}

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="                http://www.springframework.org/schema/beans                http://www.springframework.org/schema/beans/spring-beans.xsd">    <bean id="singleMe" scope="singleton">        <constructor-arg type="java.lang.String" value="Singleton -- Jan Machacek"/>    </bean>    <bean id="prototypeMe" scope="prototype">        <constructor-arg type="java.lang.String" value="Prototype -- Jan Machacek"/>    </bean></beans>

Bean b1=Singleton -- Jan Machacek, b2=Singleton -- Jan MachacekSame?  trueEqual? trueBean b1=Prototype -- Jan Machacek, b2=Prototype -- Jan MachacekSame?  falseEqual? true