A one-to-many mapping relationship in Java

Through chestnuts, a man can have more than one car

Define people this class

People can have a lot of cars, class car properties with arrays

classperson{PrivateString name; PrivateString Phone; Privatecar[] Car;  PublicPerson () {} PublicPerson (string name, String phone) { This. Name =name;  This. Phone =phone; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicString Getphone () {returnphone; }     Public voidSetphone (String phone) { This. Phone =phone; }     Publiccar[] Getcar () {returncar; }     Public voidSetcar (car[] Car) { This. Car =car; }     PublicString GetInfo () {return"Name" +name+ ", phone" +phone; }}

Then define the car class

classcar{PrivateString name; Private DoublePrice ; private person person;  PublicCar () {} PublicCar (String name,DoublePrice ) {         This. Name =name;  This. Price =Price ; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     Public DoubleGetPrice () {returnPrice ; }     Public voidSetprice (DoublePrice ) {         This. Price =Price ; }     PublicPerson Getperson () {returnPerson ; }     Public voidSetperson (person person) { This. person =Person ; }     PublicString GetInfo () {return"Brand:" +name+ "Price:" +Price ; }

Then, in the test class, each instance of the person class and the car class

Man, this object is only new.

Cars can be unlimited, here are symbolic examples of three

        New Person ("a three", "33333333");         New Car ("BMW", 400000);         New Car ("Bora", 100000);         New Car ("Bao Chun", 800

After the object is instantiated, set up relationships with each other, i.e. one person corresponds to three cars, and each car corresponds to one person

Passing values by set method

        P.setcar (new  car[]{c1,c2,c3});         C1.setperson (p);        C2.setperson (p);        C3.setperson (p);

Test

Through people, check the vehicle information under it

System.out.println (P.getinfo () + "owned vehicle");  for (int i=0;i<p.getcar (). length;i++) {    //array type print with For loop }

Run

Through the car, find the owner information

System.out.println (C1.getinfo () + "owner of this car:" +C1.getperson (). GetInfo ()); System.out.println (C2.getinfo ()+ "owner of this car:" +C1.getperson (). GetInfo ()); System.out.println (C3.getinfo ()+ "owner of this car:" +c1.getperson (). GetInfo ());

Run

A one-to-many mapping relationship in Java