就是按照这种思路：
1、创建两个接口（载客接口A-载客量）、（载货接口B-载货量），载客和货接口C extend 载客接口A，载货接口B（载客量、载货量），一个抽象父类Car（车型、单价-->元/天）；
2、实现-卡车类 extend 父类Car implement 载货接口B；
实现-客车类 extend 父类Car implement 载客接口A；
实现-皮卡类 extend 父类Car implement 载客和货接口C；
3、租车系统类：一维数组 实例化 卡车对象、客车对象 和 皮卡对象；
4、客户选车、分类汇总车辆后，输出租车明细与总价。
2017-05-04
//总类
public class Car {
private String name;
private int prices;
private int id;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrices() {
return prices;
}
public void setPrices(int prices) {
this.prices = prices;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}载货接口：
public interface CargoNum {
void setCargoNum(int num);
}载人接口：
public interface PersonNum {
void setPersonNum(int num);
}载人车类：
public class Bus extends Car implements PersonNum{
private int personNum;
public Bus(String name, int prices, int personNum) {
super.setName(name);
super.setPrices(prices);
this.personNum = personNum;
}
public int getPersonNum() {
return personNum;
}
public void setPersonNum(int personNum) {
this.personNum = personNum;
}
@Override
public String toString() {
return getName()+"\t\t"+
getPrices()+"/天\t"+
"载人："+getPersonNum()+"人";
}
}载货车类：
public class CargoCar extends Car implements CargoNum{
private int cargoNum;
public CargoCar(String name, int prices, int cargoNum) {
this.setName(name);
this.setPrices(prices);
this.cargoNum = cargoNum;
}
public int getCargoNum() {
return cargoNum;
}
public void setCargoNum(int cargoNum) {
this.cargoNum = cargoNum;
}
@Override
public String toString() {
return getName()+"\t\t"+
getPrices()+"/天\t"+
"载货："+getCargoNum()+"吨";
}
}混合车类：
public class MixCar extends Car implements PersonNum, CargoNum {
private int cargoNum;
private int personNum;
public MixCar(String name, int prices, int personNum, int cargoNum) {
super.setName(name);
super.setPrices(prices);
this.personNum = personNum;
this.cargoNum = cargoNum;
}
@Override
public void setCargoNum(int num) {
cargoNum = num;
}
@Override
public void setPersonNum(int num) {
personNum = num;
}
public int getCargoNum() {
return cargoNum;
}
public int getPersonNum() {
return personNum;
}
@Override
public String toString() {
return getName() + "\t\t" +
getPrices() + "/天\t" +
"载人：" + getPersonNum() + "人 "+
"载货：" + getPersonNum() + "吨";
}
}工具处理类：
public class CarUtil {
private static int id = 0;
private List<Car> carUtilList;
public CarUtil() {
id = 0;
carUtilList = new ArrayList<>();
}
public void add(Car car) {
id++;
if (car instanceof Bus) {
Bus bus = (Bus) car;
System.out.println(id+".\t\t"+ bus.toString());
} else if (car instanceof CargoCar) {
CargoCar cargoCar = (CargoCar) car;
System.out.println(id+".\t\t"+cargoCar.toString());
}else if (car instanceof MixCar) {
MixCar mixCar = (MixCar) car;
System.out.println(id+".\t\t"+mixCar.toString());
}
carUtilList.add(car);
}
public Car getCar(int index) {
return carUtilList.get(index);
}
}主函数：
public class Main {
private static CarUtil carUtil;
public static void main(String[] args) {
System.out.println("欢迎使用大大租车系统：\n" +
"您是否要租车:1是 0否");
int isUse = getInput();
while (isUse != 1 && isUse != 0) {
System.out.println("输入错误。");
System.out.println("欢迎使用大大租车系统：\n" +
"您是否要租车:1是 0否");
isUse = getInput();
}
if (isUse == 0) {
System.out.println("系统已退出");
return;
} else {
System.out.println("您可租车的类型及价目表：");
System.out.println("序号\t汽车名称\t 租金\t 容量");
initData();
System.out.println("请输入您要租车的数量");
int num = getInput();
int[] index = new int[num];
for (int i = 0; i < num; i++) {
System.out.println("请输入第" + (i + 1) + "辆车的序号：");
index[i] = getInput();
}
System.out.println("请输入租车天数：");
int days = getInput();
output(index, days);
}
}
private static void output(int[] indexes, int days) {
int numPeople = 0;
int numCargo = 0;
StringBuilder cargoCarName = new StringBuffer();
StringBuilder pCarName = new StringBuffer();
int price = 0;
for (int index : indexes) {
System.out.println(index + "");
Car car = carUtil.getCar(index-1);
price += car.getPrices();
if (car instanceof Bus) {
Bus bus = (Bus) car;
pCarName.append(car.getName()).append(" ");
numPeople = bus.getPersonNum() + numPeople;
} else if (car instanceof MixCar) {
MixCar mixCar = (MixCar) car;
pCarName.append(car.getName()).append(" ");
cargoCarName.append(car.getName()).append(" ");
numPeople += mixCar.getPersonNum();
numCargo += mixCar.getCargoNum();
} else if (car instanceof CargoCar) {
CargoCar cargoCar = (CargoCar) car;
cargoCarName.append(car.getName()).append(" ");
numCargo += cargoCar.getCargoNum();
}
}
System.out.println("***可载人的车有：");
System.out.println(pCarName + "共载人：" + numPeople + "人");
System.out.println("***可载货的车有：");
System.out.println(cargoCarName + "共载货：" + numCargo + "吨");
System.out.println("***出租车总价格：" + price*days);
}
public static int getInput() {
Scanner scanner = new Scanner(System.in);
return scanner.nextInt();
}
public static void initData() {
carUtil = new CarUtil();
carUtil.add(new Bus("奥迪A4", 500, 4));
carUtil.add(new Bus("马自达6", 400, 4));
carUtil.add(new MixCar("皮雪卡6", 450, 4, 2));
carUtil.add(new Bus("金龙", 800, 20));
carUtil.add(new CargoCar("松花江", 400, 4));
carUtil.add(new CargoCar("奔驰", 1000, 20));
}
}基本用上了第二季所有学的知识，除了抽象类（其实接口应该也算调用了抽象类）,仅供参考。
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