简答的答答租车代码。类有点多。Test中用到了链表，纯属方便。

Vehicle为基类

public  class Vehicle {
    String name;//车名
    double price;//价目
    int manRide;//载人数
    int load;//载重吨量
}

只载重车类

public class Truk extends Vehicle{

}

只载人车类

public class Coach extends Vehicle{

}

奥迪车类，继承载人车类

public class Audi extends Coach{
    Audi(String name,double price,int manRide){
        this.name=name;
        this.price=price;
        this.manRide=manRide;
    }
}

金龙车类，继承载人车类

public class GoldLong extends Coach{
    GoldLong(String name,double price,int manRide){
        this.name=name;
        this.price=price;
        this.manRide=manRide;
    }

}

依维柯车类，继承只载重车类

public class Iveco extends Truk{
    Iveco(String name,double price,int load){
        this.name=name;
        this.price=price;
        this.load=load;
    }
}

马自达车类，继承只载人车类

public class Mazda extends Coach{
    Mazda(String name,double price,int manRide){
        this.name=name;
        this.price=price;
        this.manRide=manRide;
    }
}

皮卡车类，继承基类，与载人，载重车类同级

public class PickUp extends Vehicle{
PickUp(String name,double price,int manRide,int load){
    this.name=name;
    this.price=price;
    this.manRide=manRide;
    this.load=load;
    }
}

松花车类

public class SongHua extends Vehicle{
    SongHua(String name,double price,int load){
        this.name=name;
        this.price=price;
        this.load=load;
    }
}

Test测试类，程序入口

package com.lyj;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Scanner;

public class Test {

    Vehicle audi=new Audi("奥迪 A4",500,4);
    Vehicle mazda=new Mazda("马自达6",400,4);
    Vehicle pickUp=new PickUp("皮卡雪6",450,4,2);
    Vehicle goldLong=new GoldLong("金      龙   ", 800,20);
    Vehicle songHua=new SongHua("松 花 江   ",400,4);
    Vehicle iveco=new Iveco("依 维 柯 ",1000,20);
    Vehicle cars[]={audi,mazda,pickUp,goldLong,songHua,iveco};
    int count;
    Vehicle []rentCar;
    static Scanner scan=new Scanner(System.in);
    int days;
    //double cost;
    double sum=0;
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
    //  System.out.println(goldLong);
        Test test=new Test();
        System.out.println("欢迎使用答答租车系统");
        System.out.println("您是否需要租车:1是0否");
        int input=scan.nextInt();
        if(input==0)
            return;
        test.priceTable();
        System.out.println("输入租车的数量");
        int num=scan.nextInt();
        test.setRentCar(num);
        test.setDays();
        test.bill();
    }
    /*
     * 租车天数
     */
    public void setDays(){
        System.out.println("请输入租车天数:");
        days=scan.nextInt();
    }

    /*
     * 账单
     */
    public void bill(){
        int people=0;
        int weight=0;
        List<Vehicle>coachs=new LinkedList<Vehicle>();
        List<Vehicle> truks=new LinkedList<Vehicle>();
        for(int i=0;i<rentCar.length;i++){
            boolean b0=rentCar[i] instanceof Coach ;
            boolean b1=rentCar[i] instanceof Truk;
            boolean b2=rentCar[i] instanceof PickUp;
            if(b0||b2)
                coachs.add((Vehicle)rentCar[i]);
            if(b1||b2)
                truks.add((Vehicle)rentCar[i]);
        }
        System.out.println("您的账单有：");
        System.out.println("***可载人的车有：");
        for(Vehicle coach:coachs){
            System.out.print(coach.name+"    ");
            people+=coach.manRide;
        }
        System.out.println("共载人："+people);
        System.out.println("***可载物的车有：");
        for(Vehicle truk:truks){
            System.out.print(truk.name+"    ");
            weight+=truk.load;
        }
        System.out.println("共载货："+weight);
        System.out.println("***租车的总价格"+days*sum);

    }
    public void setCount(int num){
        count=num;
    }

    /*
     * 输入租车的类型
     */
    public void setRentCar(int count){
        rentCar=new Vehicle[count];
        int []arr={1,2,3,4,5,6};
        int flag;
        for(int i=0;i<count;i++){
            do{
                System.out.println("输入第"+(i+1)+"辆车的序号");
                int order=scan.nextInt();
                flag=Arrays.binarySearch(arr, order);//返回值为数组的下标。
            }while(flag<0||flag>5);
            rentCar[i]=cars[flag];
            //System.out.println(rentCar[i]);
            sum+=rentCar[i].price;
        }

    }

    /*
     * 打印价目表
     */
    public void priceTable(){
        System.out.println("您可租车的类型及其价目表：");
        System.out.println("序号  汽车名称    租金       容量");
        for(int i=0;i<cars.length;i++){
            switch(i){
            case 0:
            case 1:
            case 3:
                    System.out.println(i+1+".   "+cars[i].name+"  "+cars[i].price+"元/天   " +
                            "  载人:"+cars[i].manRide+"人");
                    break;
            case 2:
                    System.out.println(i+1+".   "+cars[i].name+"  "+cars[i].price+"元/天   " +
                            "  载人:"+cars[i].manRide+"人,载货:"+cars[i].load+"吨");
                    break;
            case 4:
            case 5:
                    System.out.println(i+1+".   "+cars[i].name+"  "+cars[i].price+"元/天   " +
                            "  载货:"+cars[i].load+"吨");
                    break;
            }
        }

    }

}