类与数据表的关联

╰+攻爆jí腚メ 2022-06-10 10:41 150阅读 0赞

public class Member {
        private int mid;
        private String name;
        private Car car;
        public Member() {}
        public Member(int mid,String name) {
            this.mid = mid;
            this.name = name;
        }
        public void setCar(Car car) {   //设置每个人的车
            this.car = car;
        }
        public Car getCar() {           //取得一个人的车
            return this.car;
        }
        public String getMemberInfo() {
       //取得人的信息
            return "人员编号："+this.mid+",姓名："+this.name;
        }
        public static void main(String[] args) {
            Member mem = new Member(1,"张三");//定义一个人
            Car car = new Car("宝马","红色"); //定义一辆车
            mem.setCar(car);                //一个人有一辆车
            car.setMember(mem);             //一辆车属于一个人
            System.out.println("取得member的信息："+mem.getMemberInfo());
            System.out.println("取得member对应的car的信息："+mem.getCar().getCarInfo());
        }
    }
    class Car{
        private String title;
        private String color;
        private Member member;
        public Car() {}
        public Car(String title,String color) {
            this.title = title;
            this.color = color;
        }
        public void setMember(Member member){
       //一辆车属于一个人
            this.member = member;
        }
        public Member getMember() {         //取得车所属的人
            return this.member;
        }
        public String getCarInfo() {        //取得车的信息
            return "汽车名字："+this.title+",颜色:"+this.color;
        }
    }

输出结果：  
取得member的信息：人员编号：1,姓名：张三  
取得member对应的car的信息：汽车名字：宝马,颜色:红色