Spring的依赖注入的2种方式（1天时间）

package com.baobaotao1;

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

public class CarServiceImpl implements CarService {
    
     private CarDao carDao;
     public void setCarDao(CarDao carDao) {
          this.carDao = carDao;
　　　}

        public void produceDi(){
            carDao.produceLun();
            System.out.println("閹绘劒绶垫惔鏇犳磸缂佹瑨婧呯?涳拷");
        }
        
        public static void main(String[] args){
        System.out.println(123);    
        ApplicationContext ctx = 
                new ClassPathXmlApplicationContext("applicationContext.xml"); 
        CarService boss = (CarService) ctx.getBean("carService");
                boss.produceDi();
        }
}

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘carTest‘ defined in class path resource [applicationContext.xml]: Cannot resolve reference to bean ‘carService‘ while setting bean property ‘carService‘; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘carService‘ defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property ‘carDao‘ of bean class [com.baobaotao1.CarServiceImpl]: Bean property ‘carDao‘ is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?