答答租车系统简易版Demo

较为简单的程序，可能没有利用全面对对象的特性，但从初始功能上可以达到题目要求。
测试类，main方法所在：

package com.bibi.imooc;
import java.util.*;
public class LeaseCar {

    private static Scanner num1;

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("欢迎进入租车系统"); 
        System.out.println("请问您是否要租车？输入1租车，输入2退出。");
        Scanner input1=new Scanner(System.in);
        int in=input1.nextInt();
        if (in==1) {
            System.out.println("您可租车的类型及其价目表：");
            System.out.println("序号\t车型\t租金（元/天）\t载客、货量");
            //创建车对象，并赋予其相应属性，并输出
            Car car1=new Carriage();//车1
            car1.getNumber(1, "奥迪A4", 500, 4, 0);
            System.out.println(car1.toString());
            Car car2=new Carriage();//车2
            car2.getNumber(2, "马自达6", 400, 4, 0);
            System.out.println(car2.toString());
            Car car3=new PickUp();//车3
            car3.getNumber(3, "皮卡雪", 450, 4, 2);
            System.out.println(car3.toString());
            Car car4=new Carriage();//车4
            car4.getNumber(4, "金龙", 800, 20, 0);
            System.out.println(car4.toString());
            Car car5=new Truck();//车5
            car5.getNumber(5, "松花江", 400, 0, 4);
            System.out.println(car5.toString());
            Car car6=new Truck();//车6
            car6.getNumber(6, "依维河", 1000, 0, 20);
            System.out.println(car6.toString());
            //录入租车的数量、型号、天数
            System.out.println("请输入车的租用数量");
            Scanner input2=new Scanner(System.in);int in2=input2.nextInt();
            int[] counts=new int[in2];int days=0;//counts代表车型数组；days代表租用天数
            for(int i=0;i<in2;i++) {
            System.out.println("请输入第"+ (i+1) +"辆车的序号");
            Scanner input3=new Scanner(System.in);counts[i]=input3.nextInt();
            }
            System.out.println("请输入租车天数");
            Scanner input4=new Scanner(System.in);days=input4.nextInt();
            //统计各型号车的数量
            int sum1=0,sum2=0,sum3=0,sum4=0,sum5=0,sum6=0;
            for(int j=0;j<in2;j++) {
                if (counts[j]==1) {sum1++;}
                if (counts[j]==2) {sum2++;}
                if (counts[j]==3) {sum3++;}
                if (counts[j]==4) {sum4++;}
                if (counts[j]==5) {sum5++;}
                if (counts[j]==6) {sum6++;} 
            }
            //统计总金额、总载客人数
            System.out.println("您的总账单为：");
            System.out.println("奥迪A4："+sum1+"辆\t马自达6："+sum2+"辆\t皮卡雪："+sum3+"辆");
            System.out.println("金龙："+sum4+"辆\t松花江："+sum5+"辆\t依维柯："+sum6+"辆");
            System.out.println("总载客数："+(sum1*4+sum2*4+sum3*4+sum4*20));
            System.out.println("总载货吨数："+(sum3*2+sum5*4+sum6*20));
            System.out.println("总金额数："+(sumCount(sum1,days)*500+sumCount(sum2,days)*400+
                    sumCount(sum3,days)*450+sumCount(sum4,days)*800+sumCount(sum5,days)*400+
                    sumCount(sum6,days)*1000));

        }else{System.exit(0);/*System.exit(int status)是中止当前虚拟机的运行
        ，也就是强制性的推出程序。那个参数是状态码，0表示正常退出程序，
        其他值表示异常退出。*/}

    }
    //计算租车数量乘以天数，略有不足，未把金额变为参数3
    public static int sumCount(int sum,int days) {
        // TODO Auto-generated method stub
        int sums=sum*days;
        return sums;

    }

父类Car：

public class Car {
int pasCapacity;//载客量Passenger Capacity、人
int freCapacity;//载货量Freight Capacity、吨
int rent;//日租金、元
int rentDay;//租用天数、天
int num;//车序号
String name;//车名
public void getNumber(int num,String name,int rent,int pasCapacity,int freCapacity) {
    // TODO Auto-generated method stub
    this.num=num;
    this.name=name;
    this.rent=rent;
    this.pasCapacity=pasCapacity;
    this.freCapacity=freCapacity;
    }
@Override
public String toString() {
    return num+".\t"+name+"\t"+rent+"\t载客量"+pasCapacity+"\t载货量"+freCapacity ;
}

}

子类Carriage：

public class Carriage extends Car {

    @Override
    public void getNumber(int num, String name, int rent, int pasCapacity, int freCapacity) {
        // TODO Auto-generated method stub
        super.getNumber(num, name, rent, pasCapacity, freCapacity);
    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return num+".\t"+name+"\t"+rent+"\t载客量"+pasCapacity;
    }

子类Truck：

public class Truck extends Car {

    @Override
    public void getNumber(int num, String name, int rent, int pasCapacity, int freCapacity) {
        // TODO Auto-generated method stub
        super.getNumber(num, name, rent, pasCapacity, freCapacity);
    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return num+".\t"+name+"\t"+rent+"\t载货量"+freCapacity ;
    }
}

子类PickUp：

public class PickUp extends Car {
    @Override
    public void getNumber(int num, String name, int rent, int pasCapacity, int freCapacity) {
        // TODO Auto-generated method stub
        super.getNumber(num, name, rent, pasCapacity, freCapacity);
    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return num+".\t"+name+"\t"+rent+"\t载客量"+pasCapacity+"\t载货量"+freCapacity ;
    }
}