spring IOC一個類有多個構造器，用構造器注入怎麼解決比對問題

Car 類寫入兩個構造器（參數不同）

package com.beans;

public class Car {
       
     private String brand;
     private String corp;
       private double price;
       private int maxSpeed;
       
       public Car(String brand, String corp, double price) {
      super();
      this.brand = brand;
      this.corp = corp;
      this.price = price;
    }
       
       public Car(String brand, String corp, int maxSpeed) {
      super();
      this.brand = brand;
      this.corp = corp;
      this.maxSpeed = maxSpeed;
    }

       @Override
    public String toString() {
      return "Car [brand=" + brand + ", corp=" + corp + ", price=" + price + ", maxSpeed=" + maxSpeed + "]";
    }
}      

配置檔案如下

<?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">

    <!-- 配置bean 
    class :bean 的全類名，通過反射的方式在IOC容器中建立bean，是以要求必須要有無參的構造器
    id： 表示容器中唯一的id
    -->
    
  
    <!--通過構造方法配置bean的屬性 -->
    <bean id="car" class="com.beans.Car">
    <constructor-arg value="Audi" index="0"></constructor-arg>
    <constructor-arg value="ShangHai" index="1"></constructor-arg>
    <constructor-arg value="30000" index="2"></constructor-arg>
    
    </bean>
    
    <bean id="car2" class="com.beans.Car">
    <constructor-arg value="Boma"></constructor-arg>
    <constructor-arg value="ChangSha"></constructor-arg>
    <constructor-arg value="240"></constructor-arg>
    </bean>
    
    
</beans>      

運作主類

package com.beans;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

  public static void main(String[] args) {
    
    
       //1.建立spring的IOC容器對象
    //ApplicationContext 代表IOC容器 是 BeanFactory 接口的子接口
    
    // ClassPathXmlApplicationContext: 是 ApplicationContext的實作類，從類路徑下來加載配置檔案
        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
        
        //2.從IOC容器中擷取bean執行個體
        //利用id定位到IOC容器中的bean
    
        Car car=(Car)ctx.getBean("car");
        System.out.println(car);
        
        Car car2=(Car)ctx.getBean("car2");
        System.out.println(car2);
  }

}      

運作結果如圖所示，都比對到了第一個構造器。

那麼怎麼讓第二個bean比對到第二個構造器呢?

加一下屬性類型就可以了，如下圖

<bean id="car2" class="com.beans.Car">
    <constructor-arg value="Boma"></constructor-arg>
    <constructor-arg value="ChangSha"></constructor-arg>
    <constructor-arg value="240" type="int"></constructor-arg>
    </bean>