程序已經(jīng)執(zhí)行完“租車天數(shù)”的輸入了，但緊接著那一段代碼（加粗）一直報(bào)錯，感覺語法應(yīng)該沒有問題，有朋友能幫我看下是什么原因嗎？


//父類
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);//賦值來分類		
????	public?abstract?void?carList();
????	}

//客車類

package?com.imooc;
public?class?Passengercar?extends?Vehicle?{
public?void?chooseNum(int?num)?{
this.carNum?=?num;
switch(carNum)?{
case?1:
carName?=?"奧迪A6";
rent?=?500;
passengerCapacity?=?4;
break;
case?2:
carName?=?"馬自達(dá)6";
rent?=?400;
passengerCapacity?=?4;
break;
case?3:
carName?=?"金龍";
rent?=?800;
passengerCapacity?=?20;
break;
}
}
@Override
public?void?carList()?{
//?TODO?Auto-generated?method?stub
System.out.println(carNum?+?".?"?+?carName?+?"?"?
+?rent?+?"元/天?"?+?"載人："?+?passengerCapacity?);
}
}

//卡車類

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?=?"依維柯";
rent?=?1000;
cargoCapacity?=?20;
break;
}
}
@Override
public?void?carList()?{
//?TODO?Auto-generated?method?stub
System.out.println(carNum?+?".?"?+?carName?+?"?"?
+?rent?+?"元/天?"?+?"載貨："?+?cargoCapacity?);
}
}

//皮卡類
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?"?+?"載人："?+?passengerCapacity?+?"?"				
		?				+?"載貨："?+?cargoCapacity?);	}}

//執(zhí)行語句

package com.imooc;

import java.util.Scanner;

public class Test {

static int[] carNumList;

static int duration; //總租車天數(shù)

static double[] carCostList; //總租車成本

static Vehicle[] rentList;//租車對象集合

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() {? ? ? ? ? ? ? ? //打印選車列表

System.out.println("您可租車的類型及其價(jià)格表：");

System.out.println("序號 汽車名稱 租金 容量");

Vehicle showList1 = new Passengercar();//打印客車列表

for(int i = 1; i <= 3; i++) {

showList1.chooseNum(i);

showList1.carList();

}

Vehicle showList2 = new Truck();//打印貨車列表

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() { //輸入租車數(shù)據(jù)

System.out.println("請輸入您要租車的數(shù)量：");

Scanner input2 = new Scanner(System.in);

int num = input2.nextInt();

carNumList = new int[num];? ?//保存選車編號

for(int i = 1 ; i <= num ; i++) {

System.out.println("請輸入第" + i + "輛車的序號:");

Scanner input3 = new Scanner(System.in);

int no = input3.nextInt();

carNumList[i - 1] = no;

}

System.out.println("請輸入租車的天數(shù)：");

Scanner input4 = new Scanner(System.in);

duration = input4.nextInt();

for(int j = 0; j <= (num - 1); j++) { //建立與其他列表對應(yīng)關(guān)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("您的賬單");

System.out.println("可載人的車為：");

for(Vehicle i : rentList) {

if(i.passengerCapacity != 0) {

System.out.print(i.carName + " ");

}

}

System.out.println("可載貨的車為：");

for(Vehicle i : rentList) {

if(i.cargoCapacity != 0) {

System.out.print(i.carName + " ");

}

}

System.out.println("總租金為：");

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("歡迎來到達(dá)達(dá)租車系統(tǒng)！");

Scanner input = new Scanner(System.in);

System.out.println("您是否要租車：1 是 0 否");

int choice = input.nextInt();

if((choice != 1)&&(choice != 0) ) {

System.out.println("輸入有誤！");

}else if(choice == 0) {

System.out.println("歡迎下次光臨！");

}else {

show();//show()必須為靜態(tài)方法才能直接調(diào)用

rentCar();

bill();

}

}

}