java映射一对一关系

java映射⼀对⼀关系/**
⼀个⼈有有⼀个⾝份证
⼀个⾝份证只能属于某⼀个⼈
*/
class Person{ //⼈
private String name;
private String sex;
private IDCard iDCard; //⼀个⼈有有⼀个⾝份证
public Person(){}
public Person(String name,String sex){
=name;
this.sex=sex;
}
//getter setter⽅法
public IDCard getIDCard(){return iDCard;}
public void setIDCard(IDCard iDCard){this.iDCard=iDCard;}
public String getInfo(){
return "姓名："+name+"，性别："+sex;
}
}
class IDCard{ //⾝份证
private String number;
private String addr;
private Person person; //⼀个⾝份证只能属于某⼀个⼈
public IDCard(){}
public IDCard(String number,String addr){
this.number=number;
this.addr=addr;
}
//getter setter⽅法
public Person getPerson(){return person;}
public void setPerson(Person person){this.person=person;}
public String getInfo(){
return "⾝份证号："+number+"，籍贯："+addr;
}
}
public class App {
public static void main(String[] args) {
Person p1=new Person("王希宝","男");
IDCard iD1=new IDCard("37030619XXXXXX0000","淄博市张店区");
//设置关联关系
p1.setIDCard(iD1);
iD1.setPerson(p1);
//取得数据
//1、某⼈的⾝份证
// System.out.println(p1.getInfo()+" - 的⾝份证信息是：");
// System.out.println(p1.getIDCard().getInfo());
//2、某⾝份证的所有⼈
System.out.println(iD1.getInfo()+" - 的所属⼈是：");
System.out.println(iD1.getPerson().getInfo());
}
}。