我做的JAVA第二季最后的那个租车系统，最后有一个问题搞了很久都搞不定了。
问题出在最后的计算金额，详情如下
文件:Menu.java
package com.ybw.sys;
import java.util.Scanner;
public class Menu {
public static void main(String[] args) {
System.out.println("欢迎使用达达租车系统!");
Truck[] truck=new Truck[3];
PassengerCar[] passenger=new PassengerCar[3];
PickUp[] pickup=new PickUp[3];
for(int i=0;i<truck.length;i++)
truck[i]=new Truck();
truck[0].Truck("T01","卡车", "垃圾大王",10,1000);
truck[1].Truck("T02","卡车","公共事业卡车",20,1500);
truck[2].Truck("T03","卡车","矿石搬运车",25,1800);
for(int i=0;i<passenger.length;i++)
passenger[i]=new PassengerCar();
passenger[0].PassengerCar("P01","中小型车","奥北 小辣椒",6,700);
passenger[1].PassengerCar("P02","中小型车","卡林 骷髅马",4,500);
passenger[2].PassengerCar("P03","中小型车","绝品 先知(敞篷版)",4,600);
for(int i=0;i<pickup.length;i++)
pickup[i]=new PickUp();
pickup[0].PickUp("PU01","皮卡","叛乱分子",4,2,1000);
pickup[1].PickUp("PU02","皮卡","铁尼高",3,1,800);
pickup[2].PickUp("PU03","皮卡","绝致 屌王",6,2,800);
System.out.println("以下是可以租赁的所有车辆:");
System.out.println("卡车:(ID、类型、型号、载重、租金)");
for(int i=0;i<truck.length;i++)
truck[i].show();
System.out.println("客车:(ID、类型、型号、载客、租金)");
for(int i=0;i<passenger.length;i++)
passenger[i].show();
System.out.println("皮卡:(ID、类型、型号、载客、载重、租金)");
for(int i=0;i<pickup.length;i++)
pickup[i].show();
System.out.println("请问您要租多少辆车:");
Scanner se= new Scanner(System.in);
int num=se.nextInt();//输入租车的数量
String[] total=new String[num];
System.out.println("请输入您要租赁的车辆ID:");
for(int i=0;i<num;i++)
{
Scanner sw= new Scanner(System.in);
System.out.println("第"+(i+1)+"辆车的ID:");
total[i]=new String();
total[i]=sw.nextLine();
}
System.out.println("您所将租赁的车辆如下:");
int sum=0;//总价
for(int i=0;i<num;i++)
{
if(total[i].equals(truck[i].ID))
{
truck[i].show();
sum=sum+truck[i].price;
}
//System.out.println("T"+i);
}
for(int i=0;i<num;i++)
{
if(total[i].equals(passenger[i].ID))
{
passenger[i].show();
sum=sum+passenger[i].price;
}
//System.out.println("P"+i);
}
for(int i=0;i<num;i++)
{
if(total[i].equals(pickup[i].ID))
{
pickup[i].show();
sum=sum+pickup[i].price;
}
// System.out.println("PU"+i);
}
System.out.println("您所需付款金额为:"+sum+"元");
System.out.println("欢迎下次光临！");
}//main
}//class
测试结果是这样的,
比如我输入租3辆车，然后输入这3辆车的ID，如果这3辆车的ID属于同一类（如同属于PassengerCar,
或者都属于Truck或都属于PickUp,结果是正常的。但是如果这3辆车的ID不属于同一类，
那么计算总价时，只会出错。比如输入的ID为 P1,P2,T1，那么运行只会计算P1+P2的价格，
如果输入的ID为，P1,T1,PU1，那么只会计算P1的价格，这个地方我已经卡了一个多小时
了实在不知道怎么弄了，求救。
附上其他几个类的源代码
文件：Vehicle.java
package com.ybw.sys;
public class Vehicle {
public String type;//车种类
public String name;//车名
public String ID;//ID
public int price;
}
文件：PassengerCar.java
package com.ybw.sys;
public class PassengerCar extends Vehicle {
private int passenger;//载客量
public void PassengerCar(String ID1,String type1,String name1,int passenger1,int price1)
{
ID=ID1;
type=type1;
name=name1;
passenger=passenger1;
price=price1;
}
public void show()
{
System.out.printf(ID+"\t");
System.out.printf(type+"\t ");
System.out.printf(name+"\t ");
System.out.printf(passenger+"人\t ");
System.out.printf(price+"元\t ");
System.out.println(" ");
}
}
文件:Truck.java
package com.ybw.sys;
//货车
public class Truck extends Vehicle {
private float carry;//载货量
public void Truck(String ID1,String type1,String name1,float carry1,int price1)
{
ID=ID1;
type=type1;
name=name1;
carry=carry1;
price=price1;
}
public void show()
{
System.out.printf(ID+"\t");
System.out.printf(type+"\t ");
System.out.printf(name+"\t ");
System.out.printf(carry+"吨\t ");
System.out.printf(price+"元\t ");
System.out.println(" ");
}
}
文件:PickUp.java
package com.ybw.sys;
public class PickUp extends Vehicle {
private int passenger;
private float carry;
public void PickUp(String ID1,String type1,String name1,int passenger1,float carry1,int price1)
{
ID=ID1;
type=type1;
name=name1;
carry=carry1;
passenger=passenger1;
price=price1;
}
public void show()
{
System.out.printf(ID+"\t");
System.out.printf(type+"\t");
System.out.printf(name+"\t");
System.out.printf(passenger+"人\t");
System.out.printf(carry+"吨\t");
System.out.printf(price+"元\t");
System.out.println(" ");
}
}
