这是我的代码，仅供参考，欢迎大家指正，谢谢！！
//测试类
package com.imooc;
import java.util.Scanner;
public class Initial {
public static void main(String[] args) {
// TODO Auto-generated method stub
Car[] carsForRent={new PassengerCar("奥迪A4",500,4),new PassengerCar("马自达6", 400, 4),new PickUp("皮卡雪6", 450, 4, 2),new PassengerCar("金龙", 800,20),new Trunk("松花江", 400,4),new Trunk("依维柯",1000,20)};
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");
Scanner input=new Scanner(System.in);
int u=input.nextInt();
if(u==1){
System.out.println("您可租车的类型及价目表：");
System.out.println("序号\t汽车名称\t租金\t\t容量");
int i=1;
for(Car currentCar:carsForRent){
if(currentCar instanceof PassengerCar){
System.out.println(""+i+"\t"+currentCar.getName()+"\t"+currentCar.getCost()+"/每天 \t\t"+currentCar.getCapacity()+"人");
}
else if(currentCar instanceof PickUp){
System.out.println(""+i+"\t"+currentCar.getName()+"\t"+currentCar.getCost()+"/每天 \t\t"+currentCar.getCapacity()+"人/"+currentCar.getCapacity1()+"吨");
}
else{
System.out.println(""+i+"\t"+currentCar.getName()+"\t"+currentCar.getCost()+"/每天\t\t"+currentCar.getCapacity1()+"吨");
}
i++;
}
System.out.println("请输入您要租汽车的数量：");
int n=input.nextInt();
int fair=0;
int contain=0;
int contain1=0;
int[] a = new int[6];
for(int j=1;j<=n;j++){
System.out.println("请输入第"+j+"辆汽车的序号：");
i=input.nextInt();
a[j-1]=i;
fair+=carsForRent[i-1].cost;
contain+=carsForRent[i-1].capacity;
contain1+=carsForRent[i-1].capacity1;
}
System.out.println("请输入租车天数：");
int day=input.nextInt();
fair*=day;
System.out.println("您的账单：");
System.out.println("***可载人的车有：");
int h=0;
for(int k=0;k<n;k++){
if(a[k]!=5||a[k]!=6){
System.out.print(carsForRent[(a[k]-1)].name+"\t");
h++;
}
}
if(h==0){
System.out.println("***没有可以载人的车！");
}
else
System.out.println("共载人："+contain+"人");
h=0;
System.out.println("***可以运货的车有：");
for(int k=0;k<n;k++){
if(a[k]==5||a[k]==6||a[k]==3){
System.out.print(carsForRent[(a[k]-1)].name+"\t");
h++;
}
}
if(h==0){
System.out.println("***没有可以运货的车！");
}
else
System.out.println("共载货："+contain1+"吨");
System.out.println("***租车总价格："+fair+"元");
}
input.close();
System.out.println("感谢您的使用！！！");
}
}//父类
package com.imooc;
public class Car {
String name;
int cost;
int capacity;
int capacity1;
public String getName(){
return name;
}
public int getCost(){
return cost;
}
public int getCapacity(){
return capacity;
}
public int getCapacity1(){
return capacity1;
}
}
//三个子类（1）
package com.imooc;
public class PassengerCar extends Car{
public PassengerCar(String name,int cost,int capacity){
this.name=name;
this.cost=cost;
this.capacity=capacity;
}
public String getName(){
return name;
}
public int getCost(){
return cost;
}
public int getCapacity(){
return capacity;
}
}
//三个子类（2）
package com.imooc;
public class PickUp extends Car {
public PickUp(String name,int cost,int capacity,int capacity1){
this.name=name;
this.cost=cost;
this.capacity=capacity;
this.capacity1=capacity1;
}
public String getName(){
return name;
}
public int getCost(){
return cost;
}
public int getCapacity(){
return capacity;
}
public int getCapacity1(){
return capacity1;
}
}
//三个子类（3）
package com.imooc;
public class Trunk extends Car {
public Trunk(String name,int cost,int capacity1){
this.name=name;
this.cost=cost;
this.capacity1=capacity1;
}
public String getName(){
return name;
}
public int getCost(){
return cost;
}
public int getCapacity1(){
return capacity1;
}
}
