以前只学过C，刚看完Java两季，第一次写这么长程序，希望能和大家互相交流一下。

创建父类Car

public class Car {

String name;

int num;

double rentPrice;

public String getName() {

return name;

}

public double getRentPrice() {

return rentPrice;

}

}

创建支持载货的接口ICargoCapacity

public interface ICargoCapacity {

public double CargoCapacity();

}

创建支持载人的接口IPeopleCapacity

public interface IPeopleCapacity {

public int PeopleCapacity();

}

创建子类Audi

public class Audi extends Car implements IPeopleCapacity {

int num=1;

String name="奥迪A4";

double rentPrice=500;

public String getName() {

return name;

}

public double getRentPrice() {

return rentPrice;

}

@Override

public int PeopleCapacity() {

// TODO Auto-generated method stub

int peopleCapacity=4;

return peopleCapacity;

}

public String toString(){

return num+". "+name+" "+rentPrice+"/天 载人:"+this.PeopleCapacity()+"人";

}

}

创建子类Mazda

public class Mazda extends Car implements IPeopleCapacity {

int num=2;

String name="马自达6";

double rentPrice=400;

public String getName() {

return name;

}

public double getRentPrice() {

return rentPrice;

}

@Override

public int PeopleCapacity() {

// TODO Auto-generated method stub

int peopleCapacity=4;

return peopleCapacity;

}

public String toString(){

return num+". "+name+" "+rentPrice+"/天 载人:"+this.PeopleCapacity()+"人";

}

}

创建子类Pika

public class Pika extends Car implements IPeopleCapacity, ICargoCapacity {

int num=3;

String name="皮卡雪6";

double rentPrice=450;

public String getName() {

return name;

}

public double getRentPrice() {

return rentPrice;

}

@Override

public double CargoCapacity() {

// TODO Auto-generated method stub

double cargoCapacity=2;

return cargoCapacity;

}

@Override

public int PeopleCapacity() {

// TODO Auto-generated method stub

int peopleCapacity=4;

return peopleCapacity;

}

public String toString(){

return num+". "+name+" "+rentPrice+"/天 载人:"+this.PeopleCapacity()+"人"+"载货:"+this.CargoCapacity()+"吨";

}

}

创建子类Jinlong

public class Jinlong extends Car implements IPeopleCapacity {

int num=4;

String name="金龙";

double rentPrice=800;

public String getName() {

return name;

}

public double getRentPrice() {

return rentPrice;

}

@Override

public int PeopleCapacity() {

// TODO Auto-generated method stub

int peopleCapacity=20;

return peopleCapacity;

}

public String toString(){

return num+". "+name+" "+rentPrice+"/天 载人:"+this.PeopleCapacity()+"人";

}

}

创建子类Songhuajiang

public class Songhuajiang extends Car implements ICargoCapacity {

int num=5;

String name="松花江";

double rentPrice=400;

public String getName() {

return name;

}

public double getRentPrice() {

return rentPrice;

}

@Override

public double CargoCapacity() {

// TODO Auto-generated method stub

int cargoCapacity=4;

return cargoCapacity;

}

public String toString(){

return num+". "+name+" "+rentPrice+"/天 载货:"+this.CargoCapacity()+"吨";

}

}

创建子类Yiweike

public class Yiweike extends Car implements ICargoCapacity {

int num=6;

String name="依维柯";

double rentPrice=1000;

public String getName() {

return name;

}

public double getRentPrice() {

return rentPrice;

}

@Override

public double CargoCapacity() {

// TODO Auto-generated method stub

double cargoCapacity=20;

return cargoCapacity;

}

public String toString(){

return num+". "+name+" "+rentPrice+"/天 载货:"+this.CargoCapacity()+"吨";

}

}

主程序

import java.util.Scanner;

public class Initial {

//打印租车列表

public static void Print(Car car[]){

System.out.println("您可租车的类型及价目表:\n序号 汽车名称 租金 容量");

for(int i=0;i

System.out.println(car[i].toString());

}

System.out.println("请输入您要租汽车的数量:");

}

public static void main(String[] args) {

System.out.println("欢迎使用答答租车系统：\n您是否要租车：1是 0否");

Scanner input=new Scanner(System.in);

if(input.nextInt()==1){

Car car[]={new Audi(),new Mazda(),new Pika(),new Jinlong(),new Songhuajiang(),new Yiweike()};

Print(car);

getCar(car);

}

else{

input.close();

System.out.println("退出系统");

}

}

//统计所选车的信息

public static void getCar(Car car[]){

Scanner input=new Scanner(System.in);

int totalPeople=0;

double totalCargo=0,totalPrice=0;

String peopleCar=" ",cargoCar=" ";

for(int i=1,carNums=input.nextInt();i<=carNums;i++){

System.out.println("请输入第"+i+"辆车的序号:");

int Num=input.nextInt();

//通过接口判断该车能否载人

if(car[Num-1] instanceof IPeopleCapacity){

totalPeople+=((IPeopleCapacity)car[Num-1]).PeopleCapacity();

peopleCar=peopleCar+car[Num-1].getName()+" ";

}

//通过接口判断该车能否载货

if(car[Num-1] instanceof ICargoCapacity){

totalCargo+=((ICargoCapacity)car[Num-1]).CargoCapacity();

cargoCar=cargoCar+car[Num-1].getName()+" ";

}

totalPrice+=car[Num-1].getRentPrice();

}

System.out.println("请输入租车天数:");

totalPrice*=input.nextInt();

input.close();

System.out.println("您的账单:\n***可载人的车有:\n"+peopleCar+"\t共载人:"+totalPeople+"人");

System.out.println("***载货的车有:\n"+cargoCar+"\t共载货:"+totalCargo+"吨");

System.out.println("***租车总价格:"+totalPrice+"元");

}

}