引用传递中如何描述一个人有一辆汽车或没有车的关系？

现在有两个实体类：人（Member）、车（Car）。

范例：现在出如下的设计；

class Member {

private String name ;

private int age ;

//如果car == null, 表示这个人没有车

Private car ; //一个人只能有一辆车

public Member (String name,int age) {

this . name = name ;

this.age = age ;

}

Public void setCar (Car car) {

this. car = car ;

}

Public Car getCar () {

return this . car ;

}

public String getMemberInfo() {

return "【Membe】rname = "+ this. name +“，age =”this.age ;

}

}

class Car {

private String name ;

private double price ;

private Member member

public Car (String name , double price) {

this . name= name;

this.price = price ;

}

public void setMember (Member member ) {

this . member = member ;

}

public Member getMember () {

return this . member ;

}

public String getCarInfo () {

return "【Car】name= ”+ this.name+"，price="=this.price ;

}

}

public class TestDemo {

public static void main (String args []) {

//第一步:根据关系设置相应的数据

//1、分别创建各自对象的实例

Member mem = new Member("于博" ,3Q) ;

Car car =new Car ("法拉利" , 5000000.0) ; //你的车

// 2、设置对象间的引用关系

mem. setCar(car) ; // 一个人有一辆车

car . setMember (mem) ; // 一辆车属于一个人

// 第二步: 根据关系取出数据

//3、通过人可以找到车

System. out. println (mem . getMemberInfo()) ;

System out. println (mem.getCar () .getCarInfo() ) ;

//4、通过车找到人

System.out.println (car .getMember () .getMemberInfo ());

 }

}