分析：
- 俩个接口：
载货接口ICapacity，抽象方法getCapacity(获取载货量)
载客接口ILoad，抽象方法getLoad(获取载客数) - 抽象父类：
Car类,属性：名称name,单价price，构造方法，Getters和Setters方法。
3.实现类：
载客Bus类，继承Car类，接口为 载客接口ILoad, 属性：载客数load,构造方法，Getters和Setters方法。
载货Truck类，继承Car类，接口为载货接口ICapacity，属性：载货量capacity,构造方法，Getters和Setters方法。
载客载货PickupTruck类，继承Car类，接口为两个接口，属性：载客数load及载货量capacity,构造方法，Getters和Setters方法。
4.客户端：
Client类，在main方法里写流程。
代码：
1.
package com.imooc.java2.ch6x;
/**
* 载人数
*/
public interface ILoad {
public int getLoad();
}2.
package com.imooc.java2.ch6x;
/**
* 载货量
*/
public interface ICapacity {
public int getCapacity();
}3.
package com.imooc.java2.ch6x;
/**
* 一个抽象父类Car（车型、单价-->元/天）；
*/
public abstract class Car {
private String name;
private double price;
public Car() {
super();
}
public Car(String name, double price) {
super();
this.name = name;
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}4.
package com.imooc.java2.ch6x;
/**
* 客车
*/
public class Bus extends Car implements ILoad {
private int load;
public Bus() {
super();
}
public Bus(String name, double price, int load) {
super(name, price);
this.load = load;
}
@Override
public int getLoad() {
// TODO Auto-generated method stub
return load;
}
public void setLoad(int load) {
this.load = load;
}
}5.
package com.imooc.java2.ch6x;
/**
* 货车
*/
public class Truck extends Car implements ICapacity {
private int capacity;
public Truck() {
super();
}
public Truck(String name, double price, int capacity) {
super(name, price);
this.capacity = capacity;
}
@Override
public int getCapacity() {
return capacity;
}
public void setCapacity(int capacity) {
this.capacity = capacity;
}
}6.
package com.imooc.java2.ch6x;
/**
* 皮卡
*/
public class PickupTruck extends Car implements ILoad, ICapacity {
private int capacity;
private int load;
public PickupTruck() {
super();
}
public PickupTruck(String name, double price, int capacity, int load) {
super(name, price);
this.capacity = capacity;
this.load = load;
}
@Override
public int getCapacity() {
return capacity;
}
@Override
public int getLoad() {
return load;
}
public void setCapacity(int capacity) {
this.capacity = capacity;
}
public void setLoad(int load) {
this.load = load;
}
}7.
package com.imooc.java2.ch6x;
import java.util.Scanner;
/**
* 客户端
*/
public class Client {
private Car[] cars;
private int[] rent;
private int rentDays;
public Client() {
super();
}
public Client(Car[] cars, int[] rent, int rentDays) {
super();
this.cars = cars;
this.rent = rent;
this.rentDays = rentDays;
}
public void initial(){
cars = new Car[6];
cars[0]=new Bus("奥迪A4",500,4);
cars[1]=new Bus("马自达6",400,4);
cars[2]=new PickupTruck("皮卡雪6",450,2,4);
cars[3]=new Bus("金龙",800,20);
cars[4]=new Truck("松花江",400,4);
cars[5]=new Truck("依维柯",1000,20);
}
public void showCars(){
System.out.println("序号 \t汽车名称\t租金\t\t容量");
for(int i=0;i<cars.length;i++){
System.out.print((i+1)+". \t"+cars[i].getName()+"\t"+cars[i].getPrice()+"元/天\t");
//判定是哪种车,instanceof:载货、载人（接口）
if(cars[i] instanceof ILoad){
System.out.print("载客："+((ILoad)cars[i]).getLoad()+"人");
}
if(cars[i] instanceof ICapacity){
System.out.print("载货："+((ICapacity)cars[i]).getCapacity()+"吨");
}
System.out.println("");
}
}
public void showBill(){
System.out.println("您的账单：");
System.out.println("***可载人的车有:");
int sum =0;
for(int i=0;i<rent.length;i++){
//rent[i]为cars的下标，所以cars[rent[i]]为车。
if(cars[rent[i]] instanceof ILoad){
System.out.print(cars[rent[i]].getName()+"\t");
sum+=((ILoad)cars[rent[i]]).getLoad();
}
}
System.out.println("共载人："+sum+"人");
System.out.println("***可载货的车有：");
sum=0;
for(int i=0;i<rent.length;i++){
if(cars[rent[i]] instanceof ICapacity){
System.out.print(cars[rent[i]].getName()+"\t");
sum+=((ICapacity)cars[rent[i]]).getCapacity();
}
}
System.out.println("共载货："+sum+"吨");
sum=0;
for(int i=0;i<rent.length;i++){
sum+=cars[rent[i]].getPrice();
}
System.out.println("***租车总价格："+(sum*this.rentDays)+"元");
}
public Car[] getCars() {
return cars;
}
public void setCars(Car[] cars) {
this.cars = cars;
}
public int getRentDays() {
return rentDays;
}
public void setRentDays(int rentDays) {
this.rentDays = rentDays;
}
public int[] getRent() {
return rent;
}
public void setRent(int[] rent) {
this.rent = rent;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Client dd = new Client();
dd.initial();
System.out.println("欢迎使用dada租车系统:");
System.out.println("您是否要租车：1是 0否");
int isRent = scanner.nextInt();
if(isRent==0){
System.exit(0);//结束
}
System.out.println("您可租车的类型及其价目表：");
dd.showCars();
System.out.println("请输入您要租汽车的数量");
int carNum = scanner.nextInt();
int[] rentCars = new int[carNum];
for(int i=0;i<carNum;i++){
System.out.println("请输入第"+(i+1)+"量车的序号");
rentCars[i]=scanner.nextInt()-1;
}
dd.setRent(rentCars);
System.out.println("请输入租车天数");
dd.setRentDays(scanner.nextInt());
dd.showBill();
}
}