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                        /Java入门第二季 升级版

有同学能帮我看一下出现什么问题吗？卡在最后一步了

程序已经执行完“租车天数”的输入了，但紧接着那一段代码（加粗）一直报错，感觉语法应该没有问题，有朋友能帮我看下是什么原因吗？


//父类
package com.imooc;
    public abstract class Vehicle {
    	public int carNum;	
    	public String carName;	
    	public double rent;	
    	public int passengerCapacity;
    	public int cargoCapacity;		
    	public abstract void chooseNum(int num);//赋值来分类		
    	public abstract void carList();
    	}
//客车类
package com.imooc;
public class Passengercar extends Vehicle {
public void chooseNum(int num) {
this.carNum = num;
switch(carNum) {
case 1:
carName = "奥迪A6";
rent = 500;
passengerCapacity = 4;
break;
case 2:
carName = "马自达6";
rent = 400;
passengerCapacity = 4;
break;
case 3:
carName = "金龙";
rent = 800;
passengerCapacity = 20;
break;
}
}
@Override
public void carList() {
// TODO Auto-generated method stub
System.out.println(carNum + ". " + carName + " " 
+ rent + "元/天 " + "载人：" + passengerCapacity );
}
}

//卡车类
package com.imooc;
public class Truck extends Vehicle {
@Override
public void chooseNum(int num) {
this.carNum = num;
// TODO Auto-generated method stub
switch(carNum) {
case 4:
carName = "松花江";
rent = 400;
cargoCapacity = 4;
break;
case 5:
carName = "依维柯";
rent = 1000;
cargoCapacity = 20;
break;
}
}
@Override
public void carList() {
// TODO Auto-generated method stub
System.out.println(carNum + ". " + carName + " " 
+ rent + "元/天 " + "载货：" + cargoCapacity );
}
}

//皮卡类
package com.imooc;public class Pickup extends Vehicle {	
@Override	public void chooseNum(int num) {
		this.carNum = num;		// TODO Auto-generated method stub	
			if(carNum == 6) {
						carName = "皮卡雪6";			
						rent = 450;			
						passengerCapacity = 4;			
						cargoCapacity = 2;		
						}	
						}	
@Override	public void carList() {
		// TODO Auto-generated method stub		
		System.out.println(carNum + ". " + carName + " "
		 				+ rent + "元/天 " + "载人：" + passengerCapacity + " "				
		 				+ "载货：" + cargoCapacity );	}}
//执行语句

package com.imooc;

import java.util.Scanner;

public class Test {

static int[] carNumList;
static int duration; //总租车天数
static double[] carCostList; //总租车成本

static Vehicle[] rentList;//租车对象集合

static Vehicle a = new Passengercar();
static Vehicle b = new Passengercar();
static Vehicle c = new Passengercar();
static Vehicle d = new Truck();
static Vehicle e = new Truck();
static Vehicle f = new Pickup();

public static void show() { //打印选车列表
System.out.println("您可租车的类型及其价格表：");
System.out.println("序号汽车名称租金容量");

Vehicle showList1 = new Passengercar();//打印客车列表
for(int i = 1; i <= 3; i++) {
showList1.chooseNum(i);
showList1.carList();
}

Vehicle showList2 = new Truck();//打印货车列表
for(int i = 4; i <= 5; i++) {
showList2.chooseNum(i);
showList2.carList();
}

Vehicle showList3 = new Pickup();//打印皮卡
showList3.chooseNum(6);
showList3.carList();
}

public static void rentCar() { //输入租车数据
System.out.println("请输入您要租车的数量：");
Scanner input2 = new Scanner(System.in);
int num = input2.nextInt();
carNumList = new int[num]; //保存选车编号

for(int i = 1 ; i <= num ; i++) {
System.out.println("请输入第" + i + "辆车的序号:");
Scanner input3 = new Scanner(System.in);
int no = input3.nextInt();
carNumList[i - 1] = no;
}

System.out.println("请输入租车的天数：");
Scanner input4 = new Scanner(System.in);
duration = input4.nextInt();

for(int j = 0; j <= (num - 1); j++) { //建立与其他列表对应关系
switch(carNumList[j]) {
case 1:
a.chooseNum(1);
rentList[j] = a;
carCostList[j] = a.rent;
break;
case 2:
b.chooseNum(2);
rentList[j] = b;
carCostList[j] = b.rent;
break;
case 3:
c.chooseNum(3);
rentList[j] = c;
carCostList[j] = c.rent;
break;
case 4:
d.chooseNum(4);
rentList[j] = d;
carCostList[j] = d.rent;
break;
case 5:
e.chooseNum(5);
rentList[j] = e;
carCostList[j] = e.rent;
break;
case 6:
f.chooseNum(1);
rentList[j] = f;
carCostList[j] = f.rent;
break;
}
}

}

public static void bill(){
System.out.println("您的账单");
System.out.println("可载人的车为：");
for(Vehicle i : rentList) {
if(i.passengerCapacity != 0) {
System.out.print(i.carName + " ");
}
}

System.out.println("可载货的车为：");
for(Vehicle i : rentList) {
if(i.cargoCapacity != 0) {
System.out.print(i.carName + " ");
}
}

System.out.println("总租金为：");
double cost = 0;
for(double i : carCostList) {
cost = cost + i;
}
cost = cost * duration;
System.out.println(cost + "元");

}

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("欢迎来到达达租车系统！");

Scanner input = new Scanner(System.in);
System.out.println("您是否要租车：1 是 0 否");
int choice = input.nextInt();
if((choice != 1)&&(choice != 0) ) {
System.out.println("输入有误！");
}else if(choice == 0) {
System.out.println("欢迎下次光临！");
}else {
show();//show()必须为静态方法才能直接调用
rentCar();
bill();
}
}

}