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                        /后端开发
                        
                            /Java
                        
                        /Java入门第二季 升级版

怎么把这种固定车辆变成可添加的呢？是直接在数组上面加？还是就是我觉得我直接这样写的代码不太严谨，怎么修改呢？

package com.dadazhuche;
import com.car.*;
import java.util.*;

public class test {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Car[] che= {new Passeng("奥迪A4",500,4),new Passeng("马自达6",400,4),new Passeng("金龙",800,20)
               ,new Pika("皮卡雪",450,4,2),new Carry("松花江",400,4),new Carry("依维柯",1000,20)};
       System.out.println("是否要租车：1：是,0：否");
       Scanner o=new Scanner(System.in);
       if(o.nextInt()==1) {
           System.out.println("序号\t汽车名称\t金额\t\t容量");
           for(int i=0;i<che.length;i++) {
               System.out.println((i+1)+che[i].toString());
           }
       }
       else {
           System.out.println("欢迎再来");
       }
       System.out.println("请输入要租车的数量");
       Scanner p=new Scanner(System.in);
       int e=p.nextInt();
       if(e>0) {
           System.out.println("             ");
           System.out.println("输入要租的天数");
           Scanner s=new Scanner(System.in);
           int j =s.nextInt();
           int a=0;
           if(j>0) {
               for(int i=1;i<=e;i++) {
                   System.out.println("输入序号"+i+"车");
                   Scanner w=new Scanner(System.in);
                   int k=w.nextInt();
                   a+=che[k-1].cost(j);
               }
               System.out.println("价格为"+a+"元");
           }
       }
   }
}

父类car

package com.car;

public class Car {

   public int cost(int j){
       return 0;
   }
}

三大子类

package com.car;

public class Carry extends Car {
   String name;
   int price;
   int weigh;
   public Carry(String name,int price,int weigh) {
       this.name=name;
       this.price=price;
       this.weigh=weigh;
   }
   public int cost(int j){
       int sum=this.price*j;
       return sum;
   }
   @Override
   public String toString() {
       return "\t"+name + "\t" + price+"元/天\t"+ "\t载货："+weigh+"吨 ";
   }

}

package com.car;

public class Passeng extends Car {
   String name;
   int price;
   int capacity;
   public Passeng(String name,int price,int capacity) {
       this.name=name;
       this.price=price;
       this.capacity=capacity;
   }
   public int cost(int j){
       int sum=this.price*j;
       return sum;
   }
   public String toString() {
       return "\t"+name + "\t" + price +"元/天\t"+ "\t载人："+capacity+"人 ";
   }
}

package com.car;

public class Pika extends Car {
   String name;
   int price;
   int weigh;
   int capacity;
   public Pika(String name,int price,int capacity,int weigh) {
       this.name=name;
       this.price=price;
       this.weigh=weigh;
       this.capacity=capacity;
   }
   public int cost(int j){
       int sum=this.price*j;
       return sum;
   }

   public String toString() {
       return "\t"+name + "\t" + price+"元/天\t" + "\t载人："+capacity+"人载货： "+weigh+"吨";
   }


}