测试三种获得对象方法

1.新建一个Demo实体类;
 package com.eduask.entity;
 public class Demo4 {
 public Demo4(){
 System.out.println("测试三种获得对象方式");
 }
 }
1. 新建一个TestDemo测试类;
 package com.eduask.entity;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 public class TestDemo4 {
 public static void main(String[] args) {
 ClassPathXmlApplicationContext cx=new ClassPathXmlApplicationContext("demo4.xml");
 Demo4 demo41=(Demo4) cx.getBean("Demo4");
 Demo4 demo42=(Demo4) cx.getBean(Demo4.class);
 Demo4 demo43=(Demo4) cx.getBean("Demo4",Demo4.class);
 System.out.println(demo41);
 System.out.println(demo42);
 System.out.println(demo43);
 }
 }
2. 新建一个xml配置文件;
 <?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="Demo4" class="com.eduask.entity.Demo4"></bean>
 </beans>