Bean的作用域

// src/com.lijunyang.model.Person
public class Car {
  private String brand;
  private double price;
}
// src/com.lijunyang.test.Main.java
public class Main {
  public static void main(String[] args) {
    ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-autowire.xml");
    Car car = (car) ctx.getBean("car");
    Car car2 = (car) ctx.getBean("car");
    System.out.println(car === car2); 
    /* 
    当配置文件的bean的scope未设置时，结果为true
    scope="prototype" 原型的，容器初始化时不创建，只有当每次获取bean的时候都创建一个，结果为false
    scope="singleton" 单例的，容器初始化时创建 结果为true
    */ 
  }
}
// src/beans-spring.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">
  <bean id="car" class="com.lijunyang.model.Car"
    // scope="" // singleton | session | request | prototype
    p:brand="Audi" p:price="200000" />
</beans>