public interface Car {
  void go();
}

public class Benz implements Car {
  public void go() {
    System.out.println("benz go......");
  }
}

public class BMW implements Car {
  public void go() {
    System.out.println("bmw go......");
  }
}

public class Person {
  String name = "";

  Car car = null;
  public Car getCar() {
    return car;
  }

  public void setCar(Car car) {
    this.car = car;
  }

  public Person(String name) {
    this.name=name;
  }

  public void Drive(){
    System.out.println(name+" is driving ...");
    car.go();
  }
}

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>3.2.6.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-beans</artifactId>
  <version>3.2.6.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>3.2.6.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context-support</artifactId>
  <version>3.2.6.RELEASE</version>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
  <bean id="car" class="org.zdk.springProj1.BMW" />
  <bean id="tom" class="org.zdk.springProj1.Person">
    <constructor-arg value="Tom" />
    <property name="car" ref="car" />
  </bean>
</beans>

public class App 
{
  public static void main( String[] args )
  {
    ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
    Person tom=(Person) context.getBean("tom");
    tom.Drive();
  }
}

Tom is driving ...
bmw go......

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
  <bean id="car" class="org.zdk.springProj1.BMW" />
  <bean id="tom" class="org.zdk.springProj1.Person" autowire="byName">
    <constructor-arg value="Tom" />
  </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans default-autowire="byName">
  <bean id="car" class="org.zdk.springProj1.BMW" />
  <bean id="tom" class="org.zdk.springProj1.Person">
    <constructor-arg value="Tom" />
  </bean>
</beans>

@Autowired
public void setCar(Car car) {
  this.car = car;
}