参考了其余小伙伴的，然后花了6,7个小时做出来了，虽然时间久，但是我真的很开心

public class CarSystem {//这是一个父类

public String name;

public int rent;

public int people;

public int goods;

@Override

public String toString(){

return "车名"+name+" "+"租金"+rent+" "+"载人"+people+" "+"载物"+goods;

}

}

public class PassangerCar extends CarSystem {//这是能载人的子类

public PassangerCar(String name,int rent,int people){

this.name = name;

this.people = people;

this.rent = rent;

}

}

public class Trunk extends CarSystem {//这是载物的子类

public Trunk(String name,int rent,int goods){

this.name = name;

this.goods = goods;

this.rent = rent;

}

}

public class PickUp extends CarSystem {//这是能载人能载物的子类

public PickUp(String name,int rent,int people,int goods){

this.name = name;

this.people = people;

this.rent = rent;

}

}

import java.util.Scanner;//这是程序的入口

public class Initail {

public static void main(String[] args) {

CarSystem c[]={new PassangerCar("奥迪A4", 500, 4),

new PassangerCar("马自达6", 600, 4),

new PickUp("皮卡雪6", 450, 2, 4),

new PassangerCar("金龙", 800, 20),

new Trunk("松花江", 400, 4),

new Trunk("依维柯", 1000, 20)};

System.out.println("欢迎来到大大租车");

System.out.println("租车请按1走错请按0");

Scanner s=new Scanner(System.in);

int p=s.nextInt();

if(p==1){

System.out.println("您可以租车的类型及其价目表：");

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

System.out.println("第"+(i+1)+"种车"+c[i]);

}

}else if(p==0){

System.out.println("谢谢点击");

}else{

System.out.println("输入错误");

}

System.out.println("请输入你要租的车的数量：");

Scanner input=new Scanner(System.in);

int[] a=new int[200]  ;

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

System.out.println("请输入您对第"+(i+1)+"种车需要的数量：");

int q=input.nextInt();

a[i]=q*c[i].rent;

}

System.out.println("请输入租车天数：");

int t=input.nextInt();

System.out.println("您的账单：");

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

System.out.println("租第"+(i+1)+"种车的费用是"+a[i]*t);

}

int sum=0;

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

sum+=a[i]*t;

}

System.out.println("共计"+sum);

}

}