定义 2 个接口
- 载人接口 IMannedCar.java
public interface IMannedCar {
int mannedNumber();
}
- 载货接口 ICarryFreight.java
public interface ICarryFreight {
int carryFreightNumber();
}
定义抽象父类 Car.java,并定义成员变量和相关抽象方法
public abstract class Car {
protected String name;
protected int rental;
public String getName() {
return name;
}
public int getRental(){
return rental;
}
public void setName(String name){
this.name = name;
}
public void setRental(int rental){
this.rental = rental;
}
}
定义三个类,继承 Car.java,并根据不同的需求实现不同的接口
- CarryCar.java,载货汽车,实现 ICarryFreight 接口
public class CarryCar extends Car implements ICarryFreight {
private int carryNumber;
public CarryCar(String name, int rental, int carryNumber) {
this.name = name;
this.carryNumber = carryNumber;
this.rental = rental;
}
@Override
public int carryFreightNumber() {
return this.carryNumber;
}
@Override
public String toString() {
return getName() + " " + getRental() + "元/天 " + "载货:" + carryFreightNumber();
}
}
- PersonCar.java,载人汽车,实现 IMannedCar 接口
public class PersonCar extends Car implements IMannedCar {
private int mannedNumber;
public PersonCar(String name, int rental, int mannedNumber) {
this.name = name;
this.rental = rental;
this.mannedNumber = mannedNumber;
}
@Override
public int mannedNumber() {
return this.mannedNumber;
}
@Override
public String toString() {
return getName() + " " + getRental() + "元/天 载人:" + mannedNumber();
}
}
- PickupTruck.java,皮卡类,实现2个接口
public class PickupTruck extends Car implements IMannedCar, ICarryFreight {
private int carryNumber;
private int mannedNumber;
public PickupTruck(String name, int rental, int mannedNumber, int carryNumber) {
this.name = name;
this.rental = rental;
this.carryNumber = carryNumber;
this.mannedNumber = mannedNumber;
}
@Override
public int mannedNumber() {
return this.mannedNumber;
}
@Override
public int carryFreightNumber() {
return this.carryNumber;
}
@Override
public String toString() {
return getName() + " " + getRental() + "元/天 载人:" + mannedNumber()+" 载货:" + carryFreightNumber();
}
}
定义一个输入和转换异常类 ParseErrorException.java
public class ParseErrorException extends Exception {
public ParseErrorException() {
}
public ParseErrorException(String message) {
super(message);
}
}
租车系统 RentCar
public class RentCar {
private List<Car> cars;
private List<Car> rentCars;
public void rent() {
rentCars = new ArrayList<>();
System.out.println("您可租车的类型及其价目表:");
initData();
showRentCarList();
}
private void initData(){
cars = new ArrayList<>();
Car a4 = new PersonCar("奥迪A4",500,4);
Car mazada6 = new PersonCar("马自达6",400,4);
Car songhuajiang= new CarryCar("松花江",400,4);
Car pikaxue6 = new PickupTruck("皮卡雪6",450,4,2);
Car jinlong = new PersonCar("金龙",800,20);
Car yiweike = new CarryCar("依维柯",1000,20);
Car pika = new PickupTruck("皮卡2",500,4,3);
cars.add(a4);
cars.add(pika);
cars.add(yiweike);
cars.add(songhuajiang);
cars.add(mazada6);
cars.add(pikaxue6);
cars.add(jinlong);
}
private void showRentCarList() {
if (cars != null && cars.size() > 0) {
System.out.println("序号 汽车名称 租金 容量");
for (int i = 0; i < cars.size(); i++) {
System.out.println(i + 1 + " " + cars.get(i).toString());
}
int carsNumber = 0;
boolean isCardNumber = false;
System.out.println("请输入您要租赁车辆的数量:");
while (!isCardNumber) {
try {
carsNumber = inNumber();
if (carsNumber <= 0) {
isCardNumber = false;
continue;
}
isCardNumber = true;
} catch (ParseErrorException e) {
isCardNumber = false;
System.out.println("请输入您要租赁车辆的数量:");
}
}
for (int j = 0; j < carsNumber; j++) {
System.out.println("请输入第" + (j + 1) + "辆车的序号:");
boolean isSerial = false;
while (!isSerial) {
int serial = 0;
try {
serial = inNumber();
} catch (ParseErrorException e) {
isSerial = false;
System.out.println("请正确的输入车辆需要");
continue;
}
if (serial <= 0 serial > cars.size()) {
System.out.println("请正确的输入车辆需要");
isSerial = false;
continue;
}
rentCars.add(cars.get(serial - 1));
isSerial = true;
}
}
statisticsCars();
} else {
System.out.println("暂时没有可供租赁的车辆!");
return;
}
}
public int inNumber() throws ParseErrorException {
Scanner scanner1 = new Scanner(System.in);
try {
String trim = scanner1.next().trim();
return Integer.parseInt(trim);
} catch (Exception e) {
throw new ParseErrorException(e.getMessage());
}
}
private void statisticsCars() {
List<Car> carryName = new ArrayList<>();
List<Car> personName = new ArrayList<>();
int manned = 0;
int carryFreight = 0;
int rently = 0;
if (rentCars != null && rentCars.size() > 0) {
for (int i = 0; i < rentCars.size(); i++) {
Car car = rentCars.get(i);
rently += car.getRental();
if (car instanceof PersonCar) {
manned += ((IMannedCar) car).mannedNumber();
personName.add(car);
} else if (car instanceof CarryCar) {
carryFreight += ((ICarryFreight) car).carryFreightNumber();
carryName.add(car);
} else {
manned += ((IMannedCar) car).mannedNumber();
carryFreight += ((ICarryFreight) car).carryFreightNumber();
carryName.add(car);
personName.add(car);
}
}
System.out.println("您租赁了:" + rentCars.size() + "辆车,总金额:" + rently);
if (carryFreight != 0) {
System.out.println("总载货量:" + carryFreight);
System.out.print("车辆类型为:");
for (Car car : carryName) {
System.out.print(car.getName() + " ");
}
System.out.println();
}
if (manned != 0) {
System.out.println("总载人量:" + manned);
System.out.print("车辆类型为:");
for (Car car : personName) {
System.out.print(car.getName() + " ");
}
System.out.println();
}
} else {
System.out.println("租赁信息有误");
}
}
}
答答租车系统入口:
public class DadaRentCar {
public static void main(String[] args) {
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");
boolean isRent = true;
while (isRent) {
Scanner scanner = new Scanner(System.in);
String trim = scanner.next().trim();
if (trim.equals("1")) {
RentCar rentCar = new RentCar();
rentCar.rent();
} else if (trim.equals("0")) {
isRent = false;
System.out.println("再见!");
} else {
System.out.println("请输入正确的指令");
}
}
}
}
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