兩個(gè)對(duì)象之間的一對(duì)一關(guān)系如何表示这刷？

比如：一個(gè)英雄（hero）對(duì)一個(gè)兵器（weapon）

/**兩個(gè)對(duì)象的一對(duì)一關(guān)系：
   比如一個(gè)英雄(hero)對(duì)一個(gè)兵器(weapon)
   雙向一對(duì)一
   單向一對(duì)一
 */

import java.util.*;
public class Main{
    public static void main(String[] args){
        Hero hero=new Hero("劉備",50);
        Weapon weapon=new Weapon("雙股劍",3);
        
        //把兩個(gè)對(duì)象關(guān)聯(lián)起來(lái)；
        hero.setWeapon(weapon);
        weapon.setHero(hero);
        
        //通過(guò)英雄來(lái)獲取他的信息娩井；
        String name=hero.getName();
        int age=hero.getAge();
        Weapon w=hero.getWeapon();
        System.out.println("我是"+name+"暇屋，我"+age+"歲，"+"我的兵器是："+w.getName()+"洞辣，兵器等級(jí)為："+w.getGrade()+"級(jí)");
        
        
    }
}


//英雄類
class Hero{
    private String name;
    private int age;
    private Weapon weapon;//一對(duì)一關(guān)系
    public void setWeapon(Weapon weapon){
        this.weapon=weapon;
    }
    public Weapon getWeapon(){
        return weapon;
    }
    public Hero(){}
    public Hero(String name,int age){
       this.name=name;
       this.age=age;
    }
    public void setName(String name){
        this.name=name;
    }
    public void setAge(int age){
        this.age=age;
    }
    public String getName(){
        return name;
    }
    public int getAge(){
        return age;
    }
    
}

//兵器類
class Weapon{
    private String name;
    private int grade;  //兵器等級(jí)
    private Hero hero;
    public void setHero(Hero hero){
        this.hero=hero;
    }
    public Hero getHero(){
        return hero;
    }
    public Weapon(){}
    public Weapon(String name,int grade){
        this.name=name;
        this.grade=grade;
    }
    public void setName(String name){
        this.name=name;
    }
    public void setAge(int grade){
        this.grade=grade;
    }
    public String getName(){
        return name;
    }
    public int getGrade(){
        return grade;
    }
}