我做的JAVA第二季最后的那個(gè)租車系統(tǒng)，最后有一個(gè)問題搞了很久都搞不定了。
問題出在最后的計(jì)算金額，詳情如下
文件:Menu.java
package?com.ybw.sys;



import?java.util.Scanner;

public?class?Menu?{

	public?static?void?main(String[]?args)?{
		System.out.println("歡迎使用達(dá)達(dá)租車系統(tǒng)!");		
		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","卡車",?"垃圾大王",10,1000);
		truck[1].Truck("T02","卡車","公共事業(yè)卡車",20,1500);
		truck[2].Truck("T03","卡車","礦石搬運(yùn)車",25,1800);
		for(int?i=0;i<passenger.length;i++)
			passenger[i]=new?PassengerCar();
		passenger[0].PassengerCar("P01","中小型車","奧北?小辣椒",6,700);
		passenger[1].PassengerCar("P02","中小型車","卡林?骷髏馬",4,500);
		passenger[2].PassengerCar("P03","中小型車","絕品??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","叛亂分子",4,2,1000);
		pickup[1].PickUp("PU02","皮卡","鐵尼高",3,1,800);
		pickup[2].PickUp("PU03","皮卡","絕致?屌王",6,2,800);
		
		
		
		?System.out.println("以下是可以租賃的所有車輛:");
		?System.out.println("卡車:(ID、類型、型號、載重、租金)");
		?for(int?i=0;i<truck.length;i++)	?
			???truck[i].show();
		?System.out.println("客車:(ID、類型、型號、載客、租金)");
		?for(int?i=0;i<passenger.length;i++)
			?passenger[i].show();
		?System.out.println("皮卡:(ID、類型、型號、載客、載重、租金)");
		?for(int?i=0;i<pickup.length;i++)
			?pickup[i].show();
		?System.out.println("請問您要租多少輛車:");
		?Scanner?se=?new?Scanner(System.in);
		?int?num=se.nextInt();//輸入租車的數(shù)量
		?String[]?total=new?String[num];
		?System.out.println("請輸入您要租賃的車輛ID:");
		?for(int?i=0;i<num;i++)
		?{
			?Scanner?sw=?new?Scanner(System.in);
			?System.out.println("第"+(i+1)+"輛車的ID:");
			?total[i]=new?String();			?
			?total[i]=sw.nextLine();				?
		?}
		?
		?System.out.println("您所將租賃的車輛如下:");
		?int?sum=0;//總價(jià)
		?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("您所需付款金額為:"+sum+"元");
		?System.out.println("歡迎下次光臨！");
	}//main

}//class

測試結(jié)果是這樣的,
比如我輸入租3輛車，然后輸入這3輛車的ID，如果這3輛車的ID屬于同一類（如同屬于PassengerCar,
或者都屬于Truck或都屬于PickUp,結(jié)果是正常的。但是如果這3輛車的ID不屬于同一類，
那么計(jì)算總價(jià)時(shí)，只會出錯(cuò)。比如輸入的ID為?P1,P2,T1，那么運(yùn)行只會計(jì)算P1+P2的價(jià)格，
如果輸入的ID為，P1,T1,PU1，那么只會計(jì)算P1的價(jià)格，這個(gè)地方我已經(jīng)卡了一個(gè)多小時(shí)
了實(shí)在不知道怎么弄了，求救。
附上其他幾個(gè)類的源代碼

文件：Vehicle.java
package?com.ybw.sys;

public?class?Vehicle?{
??public?String?type;//車種類
??public?String?name;//車名
??public?String?ID;//ID
??public?int?price;
}

文件：PassengerCar.java
package?com.ybw.sys;

public?class?PassengerCar?extends?Vehicle?{
	private?int?passenger;//載客量
??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;
//貨車
public?class?Truck?extends?Vehicle?{
??private?float?carry;//載貨量
??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+"噸\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+"噸\t");
	??System.out.printf(price+"元\t");
	??System.out.println("?");
??}
}