不过遗憾的是无法将重复的载客车或载货车不重复输出，请问有大神可以解决吗，代码如下：

package Car;
public class Car {
private String name;
private int money;
private int passagerCapacity;
private int cargoCapacity;
public Car(String name,int money,int passagerCapacity,int cargoCapacity){
this.name=name;
this.money=money;
this.passagerCapacity=passagerCapacity;
this.cargoCapacity=cargoCapacity;
}
public String getName(){
return name;
}
public int getMoney(){
return money;
}
public int getPassagerCapacity(){
return passagerCapacity;
}
public int getCargoCapacity(){
return cargoCapacity;
}
}

package Car;
public class PickupCar extends Car{
public PickupCar(String name,int money,int passagerCapacity,int cargoCapacity){
super(name,money,passagerCapacity,cargoCapacity);
}
}

package Car;
public class PickUpSnow6 extends Car{
public PickUpSnow6(String name,int money,int passagerCapacity,int cargoCapacity){
super(name,money,passagerCapacity,cargoCapacity);
}
}

package Car;
import java.util.ArrayList;
import java.util.Scanner;
public class User {
public void play() {
System.out.println("欢迎使用答答租车系统:");
System.out.println("您是否要租车：1是0否");
Scanner input = new Scanner(System.in);
int yesOrNo = input.nextInt();
if(yesOrNo == 1){
Car [] carList ={new PickupCar("AudiA4\t",500,4,0),new PickupCar("Mazda6\t",400,4,0),new PickUpSnow6("PickUpSnow6",450,4,2),new PickupCar("GoldenDragonBus",800,20,0),new Truck("SongHuaRiver",400,0,4),new Truck("Iveco\t",1000,0,20)};
System.out.println("您可租车的类型及其价目表:");
System.out.println("序号"+"\t"+"汽车名称"+ "\t\t"+ "租金(元/天)"+"\t"+"容量");
for(int i = 0;i<carList.length;i++){
System.out.println((i+1)+".\t"+carList[i].getName()+"\t"+carList[i].getMoney()+"\t"+"载人："+carList[i].getPassagerCapacity()+"人,载货："+carList[i].getCargoCapacity()+"吨");
}
System.out.println("请输入您要的汽车的数量:");
int num = input.nextInt(),i = 0;
ArrayList<Car> userList= new ArrayList<Car>();
int cost1=0,cost2=0;
int cap1=0,cap2=0;
String pickupCarName = "";
String truckName = "";
while (i < num) {
System.out.println("请输入第" + (i + 1) + "车的序号:");
int choose = input.nextInt()-1;
if(choose<0||choose>5){
System.out.println("输入错误，请再次输入序号：");
}else{
Car currentCar = carList[choose];
userList.add(currentCar);
if(currentCar instanceof PickupCar){
pickupCarName += currentCar.getName()+" ";
cost1 += currentCar.getMoney();
cap1 += currentCar.getPassagerCapacity();
i++;
}else if(currentCar instanceof PickUpSnow6){
pickupCarName += currentCar.getName()+" ";
truckName += currentCar.getName()+" ";
cost1 += currentCar.getMoney();
cap1 += currentCar.getPassagerCapacity();
cap2 += currentCar.getCargoCapacity();
i++;
}else{
truckName += currentCar.getName()+" ";
cost2 += currentCar.getMoney();
cap2 += currentCar.getCargoCapacity();
i++;
}
}
}
System.out.println("请输入租车天数:");
int day = input.nextInt();
if(day <= 0){
System.out.println("输入有误，请输入租车天数:");
day = input.nextInt();
}
System.out.println("您的账单:");
System.out.println("***可载人的车有：" + pickupCarName + "共载人：" + cap1 +"人");
System.out.println("***可载货的车有：" + truckName + "共载货：" + cap2 +"吨");
System.out.println("***租车总价格：" + day*(cost1 + cost2) +"元");
}else{
System.out.println("好的，已退出该系统");
}
input.close();
}
}

package Car;
public class UserTest {
public static void main(String[] args) {
User u1 = new User();
u1.play();
}
}