package?com.sun;
public?class?Car?{
????int?number;
????public?String?name;
????public?int?rent;
????
}
package?com.sun;
public?class?PassengerCar?extends?Car?{
????private?int?peopleCapacity;
????public?PassengerCar(){
????????
????}
????public?PassengerCar(int?number,String?name,int?rent,int?peopleCapacity){
????????this.number=number;
????????this.name=name;
????????this.rent?=rent;
????????this.setPeopleCapacity(peopleCapacity);
????????
????}
????public?double?getPeopleCapacity()?{
????????return?peopleCapacity;
????}
????public?void?setPeopleCapacity(int?peopleCapacity)?{
????????this.peopleCapacity?=?peopleCapacity;
????}
}
package?com.sun;
public?class?Trunk?extends?Car?{
????private?int?cargoCapacity;
????public?Trunk(int?number,String?name,int?rent,int?cargoCapacity){
????????this.number=number;
????????this.name?=name;
????????this.rent?=rent;
????????this.setCargoCapacity(cargoCapacity);
????????
????}
????public?double?getCargoCapacity()?{
????????return?cargoCapacity;
????}
????public?void?setCargoCapacity(int?cargoCapacity)?{
????????this.cargoCapacity?=?cargoCapacity;
????}
}
package?com.sun;
public?class?PickUp?extends?Car?{
????private?int?peopleCapacity;
????private?int?cargoCapacity;
????public?PickUp(int?number,String?name,int?rent,int?peopleCapacity,int?cargoCapacity){
????????this.number=number;
????????this.name=name;
????????this.rent?=rent;
????????this.peopleCapacity=peopleCapacity;
????????this.cargoCapacity=cargoCapacity;
????????
????}
????public?double?getPeopleCapacity()?{
????????return?peopleCapacity;
????}
????public?void?setPeopleCapacity(int?peopleCapacity)?{
????????this.peopleCapacity?=?peopleCapacity;
????}
????public?double?getCargoCapacity()?{
????????return?cargoCapacity;
????}
????public?void?setCargoCapacity(int?cargoCapacity)?{
????????this.cargoCapacity?=?cargoCapacity;
????}
}
package?com.sun;
import?java.util.*;
public?class?Demo?{
????
????@SuppressWarnings("resource")
????public?static?void?main(String[]?args)?{
????????//?TODO?Auto-generated?method?stub
????????int?sum?=?0;
????????int?j=0;
??
??????Car[]?carsForRent={new?PassengerCar(1,"奧迪A4",500,4),new?
PassengerCar(2,"馬自達6",400,4),new?PickUp(3,"皮卡雪6",450,4,2),new?
PassengerCar(4,"金龍",800,20),new?Trunk(5,"松花江",400,4),new?
Trunk(6,"依維柯",1000,20)};
????????System.out.println("歡迎使用答答租車系統\n您是否要租車：1?是?0否");
????????Scanner?input=new?Scanner(System.in);
????????switch(input.nextInt()){
????????case?0:
????????????System.out.println("謝謝使用");
????????????break;
????????case?1:
????????????System.out.println("您可租車的類型及其價目表：\n序號\t汽車名稱\t租金\t容量");
????????????for(Car?car:?carsForRent){
????????????????if(car?instanceof?PassengerCar){
????????????????????PassengerCar?c=(PassengerCar)?car;
????????????????System.out.println(car.number+"\t"+car.name+"\t"+car.rent+"元/天\t載人："+c.getPeopleCapacity()+"人");
????????????????}
????????????????if(car?instanceof?PickUp){
????????????????????PickUp?p=(PickUp)?car;
??
?????????????????
?System.out.println(car.number+"\t"+car.name+"\t"+car.rent+"元/天\t載
人："+p.getPeopleCapacity()+"人?載貨：?"+p.getCargoCapacity()+"噸");
????????????????????}
????????????????if(car?instanceof?Trunk){
????????????????????Trunk?t=(Trunk)?car;
????????????????????System.out.println(car.number+"\t"+car.name+"\t"+car.rent+"元/天\t載貨：?"+t.getCargoCapacity()+"噸");
????????????????????}
????????????????}
?????????????????System.out.println("請輸入您要租汽車的數量：");
????????????????int?n=input.nextInt();
????????????????for(int?i=1;i<=n;i++){
????????????????????System.out.println("請輸入第"+i+"輛車的序號：");
????????????????????j=input.nextInt();
????????????????????for(Car?car:?carsForRent){
????????????????????if(j==car.number)
????????????????????????sum+=car.rent;
????????????????????}????
????????????????}????
????????????}
????????System.out.println("請輸入租車天數：");
????????int?k=input.nextInt();????
????????System.out.println("總金額為："+sum*k);???
????????}
????
}
2015-12-21
僅對你的代碼做了輕微修改，思想就是用一個car數組存放選擇的車型基本信息，如：numbe、name和租金。然后再累加計算，代碼如下: package?com.sun; import?java.util.*; public?class?Demo?{ @SuppressWarnings("resource") public?static?void?main(String[]?args)?{ //?TODO?Auto-generated?method?stub int?sum?=?0; int?j?=?0; int?peopleCapSum?=?0,?cargoCapSum?=?0; Car[]?carsForRent?=?{?new?PassengerCar(1,?"奧迪A4",?500,?4),?new?PassengerCar(2,?"馬自達6",?400,?4), new?PickUp(3,?"皮卡雪6",?450,?4,?2),?new?PassengerCar(4,?"金龍",?800,?20),?new?Trunk(5,?"松花江",?400,?4), new?Trunk(6,?"依維柯",?1000,?20)?}; System.out.println("歡迎使用答答租車系統\n您是否要租車：1?是?0否"); Scanner?input?=?new?Scanner(System.in); switch?(input.nextInt())?{ case?0: System.out.println("謝謝使用"); break; case?1: System.out.println("您可租車的類型及其價目表：\n序號\t汽車名稱\t租金\t容量"); for?(Car?car?:?carsForRent)?{ if?(car?instanceof?PassengerCar)?{ PassengerCar?c?=?(PassengerCar)?car; System.out.println( car.number?+?"\t"?+?car.name?+?"\t"?+?car.rent?+?"元/天\t載人："?+?c.getPeopleCapacity()?+?"人"); } if?(car?instanceof?PickUp)?{ PickUp?p?=?(PickUp)?car; System.out.println(car.number?+?"\t"?+?car.name?+?"\t"?+?car.rent?+?"元/天\t載人：" +?p.getPeopleCapacity()?+?"人?載貨：?"?+?p.getCargoCapacity()?+?"噸"); } if?(car?instanceof?Trunk)?{ Trunk?t?=?(Trunk)?car; System.out.println( car.number?+?"\t"?+?car.name?+?"\t"?+?car.rent?+?"元/天\t載貨：?"?+?t.getCargoCapacity()?+?"噸"); } } System.out.println("請輸入您要租汽車的數量："); int?n?=?input.nextInt(); Car[]?carSelect?=?new?Car[n]; for?(int?i?=?1;?i?<=?n;?i++)?{ System.out.println("請輸入第"?+?i?+?"輛車的序號："); j?=?input.nextInt(); for?(Car?car?:?carsForRent)?{ if?(j?==?car.number) { sum?+=?car.rent; carSelect[i?-?1]?=?car; } } } System.out.println("請輸入租車天數："); int?k?=?input.nextInt(); System.out.println("您選擇了租用如下車型："); for?(Car?car?:?carSelect)?{ System.out.println(car.number?+?"\t"?+?car.name?+?"\t"?+?car.rent?+?"元/天"); if?(car?instanceof?PassengerCar)?{ PassengerCar?c?=?(PassengerCar)?car; peopleCapSum?+=?c.getPeopleCapacity(); } if?(car?instanceof?PickUp)?{ PickUp?p?=?(PickUp)?car; peopleCapSum?+=?p.getPeopleCapacity(); cargoCapSum?+=?p.getCargoCapacity(); } if?(car?instanceof?Trunk)?{ Trunk?t?=?(Trunk)?car; cargoCapSum?+=?t.getCargoCapacity(); } } System.out.println("以上車型共計可載人："?+?peopleCapSum); System.out.println("以上車型共計可載貨："?+?cargoCapSum); System.out.println("總金額為："?+?sum?*?k); } } }