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                        /Java入門第二季 升級版

交個作業(yè)~

父類Car（屬性name，price）
子類Trunk（獨有屬性：載貨量）
子類Bus（獨有屬性：載客量）
子類Pickup（獨有屬性：載貨量，載客量）
CarRentTest（測試類）

package?CarRent;

public?class?Car?{

????private?String?carName;????
????private?int?carPrice;??
??????
????public?Car(String?name,?int?price)?{
????????carName?=?name;
????????carPrice?=?price;
????}
????
????public?String?getCarName()?{
????????return?carName;
????}
????
????public?int?getCarPrice()?{
????????return?carPrice;
????}
????
????public?void?setCarName(String?carName)?{
????????this.carName?=?carName;????
????}
????
????public?void?setCarPrice(int?carPrice)?{
????????this.carPrice?=?carPrice;
????}
}

package?CarRent;

/*?貨車，只能載貨?*/

public?class?Truck?extends?Car?{

????private?int?boatload;?//?載貨量
????
????public?Truck(String?name,?int?price,?int?boatload)?{
????????super(name,?price);
????????this.boatload?=?boatload;
????}
????
????public?int?getBoatload()?{
????????return?boatload;
????}
???????
????public?void?setBoatload(int?boatload)?{
????????this.boatload?=?boatload;
????}
????
}

package?CarRent;

/*?客車，只能載人?*/

public?class?Bus?extends?Car?{

????private?int?busload;?//?載客量
????
????public?Bus(String?name,?int?price,?int?busload)?{????????
????????super(name,?price);????????
????????this.busload?=?busload;????
????}
????
????public?int?getBusload()?{????????
????????return?busload;????
????}????
????
????public?void?setBusload(int?busload)?{????????
????????this.busload?=?busload;????
????}

}

package?CarRent;

/*?皮卡，既可以載貨也可以載人?*/

public?class?Pickup?extends?Car?{????????
????
????private?int?boatload;?//?載貨量????
????private?int?busload;?//?載客量????

????public?Pickup(String?name,?int?price,?int?boatload,?int?busload)?{????????
????????super(name,?price);????????
????????this.boatload?=?boatload;????????
????????this.busload?=?busload;
????}????
????
????public?int?getBoatload()?{????????
????????return?boatload;????
????}????
????
????public?int?getBusload()?{????????
????????return?busload;????
????}????
????
????public?void?setBoatload(int?boatload)?{????????
????????this.boatload?=?boatload;????
????}????
????
????public?void?setBusload(int?busload)?{????????
????????this.busload?=?busload;????
????}
????
}

package?CarRent;

import?java.util.Scanner;
import?java.util.List;
import?java.util.ArrayList;

public?class?CarRentTest?{????

????public?static?void?main(String[]?args)?{????????
????????
????????Car?availableCars[]?=?new?Car[]?{????????????
????????????new?Bus("奧迪A4",?500,?4),????????????
????????????new?Bus("馬自達6",?400,?4),????????????
????????????new?Pickup("皮卡雪6",?450,?2,?4),????????????
????????????new?Bus("金龍",?800,?20),????????????
????????????new?Truck("松花江",?400,?4),????????????
????????????new?Truck("依維柯",?1000,?20)????????
????????};????????
????????Scanner?input?=?new?Scanner(System.in);????????
????????System.out.println("歡迎使用答答租車系統(tǒng)：");????????
????????System.out.print("您是否要租車：1?是；0?否?>>>?");????????
????????int?rentOrNot?=?input.nextInt();????????
????????while?(rentOrNot?!=?0?&&?rentOrNot?!=?1)?{
????????????System.out.print("無效輸入。請重新輸入：1?是；0?否?>>>?");????????????
????????????rentOrNot?=?input.nextInt();????????????
????????????if?(rentOrNot?==?0)?{
????????????????System.out.println("再見！歡迎下次使用！");
????????????????System.exit(0);
????????????}?else?if?(rentOrNot?==?1)?{
????????????????break;????????????
????????????}?else?{
????????????????continue;
????????????}
????????}
????????
????????System.out.println("您可租車的類型及其價目表：");????????
????????System.out.println("序號\t汽車名稱\t租金\t\t容量");????????
????????for?(int?i?=?0;?i?<?availableCars.length;?i++)?{????????????
????????????Car?car?=?availableCars[i];????????????
????????????System.out.print((i+1)+".\t");????????????
????????????System.out.print(car.getCarName()+"\t\t");????????????
????????????System.out.print(car.getCarPrice()+"元/天\t");????????????
????????????if?(availableCars[i]?instanceof?Truck)?{????????????????
????????????????System.out.print("載貨："+((Truck)car).getBoatload()+"噸\n");????????????
????????????}?else?if?(availableCars[i]?instanceof?Bus)?{????????????????
????????????????System.out.print("載人："+((Bus)car).getBusload()+"人\n");????????????
????????????}?else?if?(availableCars[i]?instanceof?Pickup)?{????????????????
????????????????System.out.print("載人："+((Pickup)car).getBusload()+"人?載貨："+((Pickup)car).getBoatload()+"噸\n");
????????????}
????????}
????????
????????System.out.print("請輸入您要租汽車的數(shù)量（0?~?"+availableCars.length+"）：>>>?");????????
????????int?rentNumber?=?input.nextInt();????????
????????while?(rentNumber?<?0?||?rentNumber?>?availableCars.length)?{
????????????System.out.print("無效輸入。請重新輸入（0?~?"+availableCars.length+"）：>>>?");
????????????rentNumber?=?input.nextInt();
????????}????????
????????List<Integer>?carsAlreadyPicked?=?new?ArrayList<>();
????????for?(int?i?=?1;?i?<=?rentNumber;?i++)?{
????????????System.out.print("請輸入第"+i+"輛車的序號：>>>?");????????????
????????????int?carID?=?input.nextInt();????????????
????????????while?(carsAlreadyPicked.contains(carID)?||?carID?<?1?||?carID?>?availableCars.length)?{????????????????
????????????????if?(carID?<?1?||?carID?>?availableCars.length)?{????????????????????
????????????????????System.out.print("無效輸入。請重新輸入：>>>?");???????????????
????????????????}?else?{????????????????????
????????????????????System.out.print("該車已選擇。請重新選擇：>>>?");???????????????
????????????????}????????????????
????????????????carID?=?input.nextInt();????????????
????????????}????????????
????????????carsAlreadyPicked.add(carID);????????
?????????}????????
?????????
?????????System.out.print("請輸入租車天數(shù)（>?0）：>>>?");????????
?????????int?rentDay?=?input.nextInt();????????
?????????while?(rentDay?<=?0)?{????????????
?????????????System.out.print("無效輸入。請重新輸入：>>>?");????????????
?????????????rentDay?=?input.nextInt();???????
?????????}????????
?????????
?????????int?totalExpense?=?0,?totalBusLoad?=?0,?totalBoatLoad?=?0;????????
?????????for?(int?id?:?carsAlreadyPicked)?{????????????
?????????????totalExpense?+=?availableCars[id-1].getCarPrice();????????
?????????}????????
?????????totalExpense?*=?rentDay;????????
?????????System.out.println("您的賬單：");????????
?????????System.out.println("***可載人的車有：");????????
?????????for?(int?id?:?carsAlreadyPicked)?{????????????
?????????????Car?car?=?availableCars[id-1];????????????
?????????????if?(availableCars[id-1]?instanceof?Bus?||?availableCars[id-1]?instanceof?Pickup)?{????????????????
?????????????????System.out.print(car.getCarName()+"\t");????????????????
?????????????????totalBusLoad?+=?(availableCars[id-1]?instanceof?Bus)???((Bus)car).getBusload()?:?((Pickup)car).getBusload();????????????
?????????????}????????
?????????}????????
?????????System.out.print("共載人："+totalBusLoad+"人\n");????????
?????????System.out.println("***載貨的車有：");????????
?????????for?(int?id?:?carsAlreadyPicked)?{????????????
?????????????Car?car?=?availableCars[id-1];????????????
?????????????if?(availableCars[id-1]?instanceof?Truck?||?availableCars[id-1]?instanceof?Pickup)?{????????????????
?????????????????System.out.print(car.getCarName()+"\t");????????????????
?????????????????totalBoatLoad?+=?(availableCars[id-1]?instanceof?Truck)???((Truck)car).getBoatload()?:?((Pickup)car).getBoatload();????????????
?????????????}????????
?????????}????????
?????????System.out.print("共載貨："+(double)totalBoatLoad+"噸\n");????????
?????????System.out.print("***租車總價格：");????????
?????????System.out.print(totalExpense+"元\n");?
????????????????
?????????input.close();????????
?????????System.out.println("再見！歡迎下次使用！");????
?????????
????}
}

慕圣8516364

2020-08-13

源自：Java入門第二季升級版 12-1

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4 回答

qq_也許_coqF04
2020-10-21

List<Integer>?carsAlreadyPicked?=?new?ArrayList<>();? ? 有木有人告訴我這個語句的作用

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#1

慕圣0830664

List<Integer> carsAlreadyPicked = new ArrayList<>(); 表示： 1.創(chuàng)建了一個List集合，集合的具體類型為ArrayList， 2.集合中只能存放Integer類型的元素，如果存放其他類型的元素（如String）則會在編譯報錯。 3.<Integer>是1.5引入的泛型寫法，如果還沒有學(xué)習(xí)泛型，暫時不用理會，后面會學(xué)到。 4.而new ArrayList<>中的<>是Java7引入的新語法，如果還沒有學(xué)習(xí)，暫時不用理會，后面會學(xué)到。