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();

}

}

}