1. car类
   public abstract class Car {
       protected int type=0;//車的類型 1載貨 2 載客 3 載貨載客都有
       protected int id=0;//車編號
       protected String name="";//車名稱
       protected int carryWeight=0;//車的載重量 5T 輕型 5T-20T重型
       protected int carryPeople=0;//載客量 小客車5人以下 大客車10人以上
       protected int rent=0;//租金 每天
   
       public int getRent(){
           return this.rent;
       }
       public String getName(){
           return this.name;
       }
       public int getCarryPeople(){
           return this.carryPeople;
       }
       public int getCarryWeight(){
           return this.carryWeight;
       }
   
       public void setArg(int type,int id,String name,int carryWeight,int carryPeople,int rent){
           this.type=type;
           this.id=id;
           this.name=name;
           this.carryWeight=carryWeight;
           this.carryPeople=carryPeople;
           this.rent=rent;
       }
   
       public abstract void  show();
   
   }

   
   

2. public class PeopleCar extends Car {
   
       public PeopleCar(int id,String name,int carryPeople,int rent){
           setArg(2,id,name,0,carryPeople,rent);
       }
       public  void  show(){
           System.out.println(this.id+".     \t"+this.name+"     \t"+this.rent+"元/天 \t"+ "載人："+this.carryPeople+"人");
       }
   
   }

3. public class WeightCar extends Car {
       public WeightCar(int id,String name,int carryWeight,int rent){
           setArg(1,id,name,carryWeight,0,rent);
       }
       public  void  show(){
           System.out.println(this.id+".     \t"+this.name+"     \t"+this.rent+"元/天 \t"+ "載貨："+this.carryWeight+"頓");
       }
   }

4. public class WorPopCar extends Car{
       public WorPopCar(int id,String name,int carryWeight,int carryPeople,int rent){
           setArg(3,id,name,carryWeight,carryPeople,rent);
       }
       public  void  show(){
           System.out.println(this.id+".     \t"+this.name+"     \t"+this.rent+"元/天 \t"+ "載人："+this.carryPeople+"人 載貨："+this.carryWeight+"頓");
       }
   }

5. import java.util.Scanner;
   
   public class Test {
       private static Car[] carArr;
       public static void main(String[] args) {
           carArr=new Car[6];
           carArr[0]=new PeopleCar(1,"歐迪A4",4,500);
           carArr[1]=new PeopleCar(2,"馬自達6",4,400);
           carArr[2]=new WorPopCar(3,"皮卡雪6",2,4,450);
           carArr[3]=new PeopleCar(4,"金龍",20,800);
           carArr[4]=new WeightCar(5,"松花江",4,400);
           carArr[5]=new WeightCar(6,"依維柯",20,1000);
           initzuche();
       }
   
       private static  void initzuche(){
           Scanner in = new Scanner(System.in);
           System.out.println("欢迎使用噠噠租车系统：");
           System.out.println("您是否要租車：1是 0否");
           int a = in.nextInt();
           if(a==1){//進入租車系統
               System.out.println("您可租車的類型及其價目表：");
               System.out.println("序號 \t汽車名稱 \t租金     \t容量");
               for (Car icar:carArr) {
                   icar.show();
               }
               System.out.println("請輸入您要租汽車的數量：");
               int num = in.nextInt();
               Car[] selectArr = new Car[num];
               //統計一起做
               String pop="";
               int popnum=0;
               String wei="";
               double weinum=0;
               int allprice=0;
               for(int i=1;i<=num;i++){
                   System.out.println("請輸入第"+i+"輛車的序號：");
                    int xh= in.nextInt();
                    Car tmp=carArr[xh-1];
                    selectArr[i-1]=tmp;
                   int tmppop=tmp.getCarryPeople();
                   int tmpwei=tmp.getCarryWeight();
                   popnum+=tmppop;
                   weinum+=tmpwei;
                   if(tmppop>0){
                       pop+=tmp.getName()+"  ";
                   }
                   if(tmpwei>0){
                       wei+=tmp.getName()+"  ";
                   }
                   allprice+=tmp.getRent();
               }
               System.out.println("請輸入租車天數：");
               double day = in.nextInt();
               System.out.println("您的賬單:");
               System.out.println("***可載人的車有:");
               System.out.println("  "+pop+"  共載人："+popnum+"人");
               System.out.println("***載貨的車有:");
               System.out.println("  "+wei+"  共載貨："+weinum+"頓");
               System.out.println("***租車總價格:"+allprice*day+"元");
           }else{
               initzuche();
           }
       }
   }

大家看下，有问题找我

父类

Car

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子类

PassengerCar

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Pickup

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Truck

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主程序

Tset

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