也算是实现了所有功能

//我用的JCreator编的，不是eclipse，代码的部分地方会略有不同但总体来说没太大差别

import java.util.Scanner;

public class execP20601{

Car Aodi=new MannedCar("奥迪A4",500,4);

Car Mzd=new MannedCar("马自达6",400,4);

Car Pkx=new Truck("皮卡雪6",450,4,2);

Car Jl=new MannedCar("金龙",800,20);

Car Shj=new Van("松花江",400,4);

Car Ywk=new Van("依维柯",1000,20);

Car[] CarInform={Aodi,Mzd,Pkx,Jl,Shj,Ywk};

public static void main(String args[]){

execP20601 Pro=new execP20601();

Pro.Step1();

Pro.Step2();

}

public void Step1(){

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");

try{

Scanner scan=new Scanner(System.in);

int Num1=scan.nextInt();

System.out.println();

int Jishu1=4;

while(Jishu1>0){

Jishu1--;

if(Num1!=1&&Num1!=0){

if(Jishu1>1)

System.out.println("输入有误，请重试，需输入整数0或1,还可重试"+Jishu1+"次！");

if(Jishu1==1)

System.out.println("输入有误，请重试，需输入整数0或1,还可重最后一次！！！");

if(Jishu1<=0){

System.out.println("输入失败，程序将自动退出");

System.exit(0);

}

System.out.println("您是否要租车：1是  0否");

Num1=scan.nextInt();

if(Num1==1||Num1==0){

System.out.println();

break;

}

System.out.println();

}

}

if(Num1==1){

System.out.println("您可租车的类型及其价目表:");

System.out.println("序号   汽车名称     租金       载量"); 

System.out.println();

for(int i=0;i<CarInform.length;i++){

System.out.print(i+1);

CarInform[i].Inform();

}

}else if(Num1==0){

System.out.println("不好意思，打扰您了，程序将自动退出，祝您生活愉快！");

System.exit(0);

}

}catch(Exception e){

e.printStackTrace();

System.out.println("输入有误");

}

}

public void Step2(){

System.out.println();

System.out.println("请输入您要租车的数量:");

Scanner scan2=new Scanner(System.in);

int Num1=scan2.nextInt();

int Jishu2=0;

int DayRent=0;

int TotalRent=0;

try{

int[] CarNum=new int[Num1];

if(Num1<=0){

System.exit(0);

}

while(Jishu2<Num1){

//System.out.println("Jishu2:"+Jishu2);

System.out.println();

System.out.println("请输入第"+(Jishu2+1)+"辆车的序号：");

CarNum[Jishu2]=scan2.nextInt()-1;

//System.out.println(CarInform[CarNum[Jishu2]].getName());

DayRent+=CarInform[CarNum[Jishu2]].getPrice();

Jishu2++;

}

System.out.println();

System.out.println("请输入租车天数：");

int Day=scan2.nextInt();

TotalRent=DayRent*Day;

System.out.println();

System.out.println("您的账单：");

System.out.println();

System.out.println("可载人的有：");

int CapaManNum=0;

for(int i=0;i<CarNum.length;i++){

if(CarInform[CarNum[i]].getType().equals("Man")||CarInform[CarNum[i]].getType().equals("Double")){

System.out.print(CarInform[CarNum[i]].getName()+"   ");

CapaManNum+=CarInform[CarNum[i]].getCapaMan();

}

}

System.out.println("总共可载"+CapaManNum+"个人");

System.out.println();

System.out.println("可载货的有：");

int CapaCargoNum=0;

for(int i=0;i<CarNum.length;i++){

if(CarInform[CarNum[i]].getType().equals("Cargo")||CarInform[CarNum[i]].getType().equals("Double")){

System.out.print(CarInform[CarNum[i]].getName()+"   ");

CapaCargoNum+=CarInform[CarNum[i]].getCapaCargo();

}

}

System.out.println("总共可载"+CapaCargoNum+"吨货");

System.out.println();

System.out.println("累计消费"+TotalRent+"元");

System.out.println();

}catch(Exception e){

e.printStackTrace();

System.out.println("输入有误");

}

}

}

abstract class Car{

private String Type;

private String name;

private int price;

private int CapaMan;

private int CapaCargo;

public String getName(){

return name;

}

public String getType(){

return Type;

}

public int getPrice(){

return price;

}

public int getCapaMan(){

return CapaMan;

}

public int getCapaCargo(){

return CapaCargo;

}

public abstract void Inform();

}

class MannedCar extends Car{

private String Type="Man";

private String name;

private int price;

private int CapaMan;

public MannedCar(String name,int price,int CapaMan){

//Inform();

this.name=name;

this.price=price;

this.CapaMan=CapaMan;

}

public String getName(){

return name;

}

public String getType(){

return Type;

}

public int getPrice(){

return price;

}

public int getCapaMan(){

return CapaMan;

}

public void Inform(){

String DayRent=price+"/天";

String Capacity="载人:"+CapaMan+"人";

String Inform="."+"     "+name+"       "+DayRent+"     "+Capacity;

StringBuilder str=new StringBuilder(Inform);

int Location=Inform.indexOf(DayRent);

int DiffValue=17-Location;

if(DiffValue>0){

for(int i=DiffValue;i>0;i--){

str.insert(Location-DiffValue," ");

}

}

System.out.println(str.toString());

//System.out.println(Inform.indexOf(DayRent));

}

}

class Truck extends Car{

private String Type="Double";

private String name;

private int price=450;

private int CapaMan;

private int CapaCargo;

public Truck(String name,int price,int CapaMan,int CapaCargo){

//Inform();

this.name=name;

this.price=price;

this.CapaMan=CapaMan;

this.CapaCargo=CapaCargo;

}

public String getName(){

return name;

}

public String getType(){

return Type;

}

public int getPrice(){

return price;

}

public int getCapaMan(){

return CapaMan;

}

public int getCapaCargo(){

return CapaCargo;

}

public void Inform(){

String DayRent=price+"/天";

String Capacity="载人:"+CapaMan+"人  "+"载货:"+CapaCargo+"吨";

String Inform="."+"     "+name+"      "+DayRent+"     "+Capacity;

System.out.println(Inform);

}

}

class Van extends Car{

private String Type="Cargo";

private String name;

private int price=400;

private int CapaCargo=4;

public Van(String name,int price,int CapaCargo){

//Inform();

this.name=name;

this.price=price;

this.CapaCargo=CapaCargo;

}

public String getName(){

return name;

}

public String getType(){

return Type;

}

public int getPrice(){

return price;

}

public int getCapaCargo(){

return CapaCargo;

}

public void Inform(){

String DayRent=price+"/天";

String Capacity="载货:"+CapaCargo+"吨";

String Inform="."+"     "+name+"       "+DayRent+"    "+Capacity;

StringBuilder str=new StringBuilder(Inform);

int Location=Inform.indexOf(Capacity);

int DiffValue=26-Location;

if(DiffValue>0){

for(int i=DiffValue;i>0;i--){

str.insert(Location-DiffValue," ");

}

}

System.out.println(str.toString());

//System.out.println(Inform.indexOf(Capacity));

}

}