分享一下代码求大佬给一点优化思路
import java.util.Scanner;
import java.lang.System;
//车的抽象类
public abstract class car {
String carName;//车名
int persons;//载客量
double weights;//载货量
int rent;//租金
//给客车使用的构造方法
public car(String carName,int persons,int rent) {
super();
this.carName=carName;
this.persons=persons;
this.rent=rent;
}
//给货车使用的构造方法
public car(String carName,double weights,int rent) {
super();
this.carName=carName;
this.weights=weights;
this.rent=rent;
}
//给皮卡使用的构造方法
public car(String carName,double weights,int persons,int rent) {
super();
this.carName=carName;
this.weights=weights;
this.persons=persons;
this.rent=rent;
}
abstract void show();
}
//客车类
public class passengerCar extends car {
public passengerCar(String carName,int persons,int rent) {
super(carName,persons,rent);
}
//重写父类show方法。
public void show(){
System.out.println(carName+" "+rent+"元/天 载人："+persons+"人");
}
}
//货车类
public class TruckCar extends car {
public TruckCar (String carName,double weights,int rent){
super(carName,weights,rent);
}
public void show(){
System.out.println(carName+" "+rent+"元/天 载货："+weights+"吨");
}
}
//皮卡类
public class pickupCar extends car {
public pickupCar (String carName,double weights,int persons,int rent){
super(carName,weights,persons,rent);
}
public void show(){
System.out.println(carName+" "+rent+"元/天 载人："+persons+"人，载货："+weights+"吨");
}
}
//租车前台系统类
public class carRentSystem {
public static void main(String[] args) {
car[] cars={new TruckCar ("松花江",4.0, 400),new TruckCar ("依维柯",20.0,1000),new pickupCar ("皮卡雪", 4.0, 2, 450),new passengerCar ("马自达", 4, 400),new passengerCar ("奥迪A4", 4, 500)};
System.out.println("欢迎使用嗒嗒租车系统：");
System.out.println("您是否要租车：1是 0否");
Scanner s1=new Scanner(System.in);
int xz=s1.nextInt();//捕捉用户选择
if (xz==1) {
System.out.println("您可租车的类型及其价目表：");
System.out.println("序号 汽车名字 租金 容量");
for (int i = 0; i < cars.length; i++) {
System.out.print(i+" ");
cars[i].show();
}
System.out.println("请输入您要租汽车的数量：");
int sl=s1.nextInt();//捕捉用户输入的数量
int[] sum=new int[sl];//用来存储用户输入的车的序号。
for (int i = 0; i < sl; i++) {
System.out.printf("请输入第%d辆车的序号：",i+1);
sum[i]=s1.nextInt();//捕捉用户输入车的序号并存入数组
}
System.out.println("请输入租车天数：");
int days=s1.nextInt();//捕捉用户输入的天数
System.out.println("您的账单：");
new carRentSystem ().bill(sum,cars,days);
}else {
System.out.println("再见");
System.exit(0);
}
}
//生存账单
public void bill(int[] sum,car[] cars,int days) {
int persons=0;//统计载客总数
double weights=0;//统计载货总数
int rents=0;//统计总金额
System.out.println("***可载人的车有：");
for (int i = 0; i < sum.length; i++) {
//判断这个序号的车是否是客车不是就跳过这次循环
if (sum[i]>2) {
System.out.print(cars[sum[i]-1].carName+" ");
persons+=cars[sum[i]-1].persons;
rents+=cars[sum[i]-1].rent;
}else {
continue;
}
}
System.out.println("共载人："+persons+"人");
System.out.println("***可载货的车有：");
for(int i=0;i< sum.length; i++) {
if (sum[i]<4) {
System.out.print(cars[sum[i]-1].carName+" ");
weights+=cars[sum[i]-1].weights;
//防止皮卡的金额被二次计算
if (sum[i]!=3) {
rents+=cars[sum[i]-1].rent;
}
}
}
System.out.println("共载货："+weights+"吨");
System.out.println("租车总价格："+rents*days+"元");
}
}代码我都是从eclipse一行一行抄下来的（这个竟然直接粘贴会写成一行），不过在这上面运行不了，应该是类名不对（他所有的类名都是HelloWorld的），不过我把运行效果截图了，求大佬帮我看看有什么可以优化的地方。
