java实现租车系统

今天用java编写了一个租车系统，过程中主要遇到的两个问题：

1、输出数组信息问题：

在得到cars[]数组后，要生成租车信息表，目前有两种思路：一是用循环输出；二是用arrays.tostring()输出数组信息。

用tostring()方法输出数组输出……@……形式的哈希码地址，这里需要对tostring()方法进行重写，在数组涉及到的类中进行重写。

不过用第二种方法输出的其实还是一个数组，形式如图所示。那么问题来了——还有没有更好的输出方法呢？

2、父类方法不能访问子类成员变量：

本来在父类car中写好的getpersoncapacity()和getgoodcapacity()方法似乎不能访问子类中的personcapacity和goodcapacity 这两个成员变量，导致调用参数时始终为0；所以在各子类方法中又独立加上了前面两个方法，问题得以解决。

运行效果图：

代码如下：

package rentcarsys;
/*
 * 总共有三种车型：载人auto，载货van，载人载货pickup
 * car 为这三种车型的父类
 * 有4种属性：
 * 编号 = number
 * 品牌 = brand
 * 租金/天 = fee
 * 载人容量 = personcapacity
 * 载货容量 = goodcapacity
 */
public class car {
 int number;
 string brand;
 double fee;
 int personcapacity;
 double goodcapacity;
 
 public car(int number, string brand, double fee){ //构造方法
 this.number = number;
 this.brand = brand;
 this.fee = fee;
 }
 
 public int getnumber(){
 return number;
 }
 
 public string getbrand(){
 return brand;
 }
 
 public double getfee(){
 return fee;
 }
 
 public int getpersoncapacity(){
 return personcapacity;
 }
 
 public double getgoodcapacity(){
 return goodcapacity;
 }
 
}

package rentcarsys;
/*
 * auto为载人汽车，除了car中的属性之外还有载人容量 personcapacity
 */
public class auto extends car{
 
 private int personcapacity;
 
 public auto(int number, string brand, double fee, int personcapacity) {
 
 super(number, brand, fee);
 this.personcapacity = personcapacity;
 }
 
 public int getpersoncapacity() {
 return personcapacity;
 }
 
 @override
 public string tostring() {
 return number + "\t" + brand + "\t" + fee + "元/天\t" + personcapacity + "人\n";
 }
 
}

package rentcarsys;
/*
 * van为载货汽车，除了car中的属性之外还有载货容量 goodcapacity
 */
public class van extends car{
 
 private double goodcapacity;
 
 public van(int number, string brand, double fee, double goodcapacity) {
 
 super(number, brand, fee);
 this.goodcapacity = goodcapacity;
 
 }
 
 public double getgoodcapacity(){
 return goodcapacity;
 }
 
 public string tostring() {
 return number + "\t" + brand + "\t" + fee + "元/天\t" + goodcapacity + "吨" + "\n";
 }
 
}

package rentcarsys;
/*
 * pickup为载人载货汽车，除了car中的属性之外还有载人容量 personcapacity,载货容量goodcapacity
 */
public class pickup extends car{
 
 private int personcapacity;
 private double goodcapacity;
 
 public pickup(int number, string brand, double fee, int personcapacity, double goodcapacity) {
 
 super(number, brand, fee);
 this.personcapacity = personcapacity;
 this.goodcapacity = goodcapacity;
 
 }
 
 public int getpersoncapacity() {
 return personcapacity;
 }
 
 public double getgoodcapacity(){
 return goodcapacity;
 }
 
 @override
 public string tostring() {
 return number + "\t" + brand + "\t" + fee + "元/天\t" +
 personcapacity + "人\t" + goodcapacity + "吨\n";
 }
}

package rentcarsys;
 
import java.util.arrays;
import java.util.scanner;
 
public class login {
 
 public static void main(string[] args){
 
 scanner input = new scanner(system.in);
 car[] cars = new car[6];
 
 system.out.print("欢迎使用答答租车系统：");
 system.out.print("您是否要租车？1、是 2、否（请输入1或2）");
 int input1 = input.nextint();
 if (input1 == 1){
 system.out.println("下面是所有车的信息：");
 
 cars[0] = new auto(1, "奥迪a4", 500.0, 4);
 cars[1] = new auto(2, "马自达6", 400.0, 4);
 cars[2] = new pickup(3, "皮卡雪6", 450.0, 4, 2);
 cars[3] = new auto(4, "金龙", 800.0, 20);
 cars[4] = new van(5, "松花江", 400.0, 4);
 cars[5] = new van(6, "依维柯", 1000.0, 20);
 
 system.out.println("序号\t" + "汽车名称\t" + "租金\t\t" + "容量(载人/载货)");
 system.out.println(arrays.tostring(cars));
// for(int i = 0; i < cars.length; i++){
// system.out.println("编号:"+ (i+1) +" 品牌:"+ cars[i].getbrand() 
// +" 租金:"+ cars[i].getfee() +"/天 载客量:"+ cars[i].getpersoncapacity()+"人"
// +" 载货量:"+ cars[i].getgoodcapacity()+"吨" );
// }
 }else{
 system.out.println("谢谢使用，再见！");
 }
 
 system.out.print("请输入你要租几种车：");
 int rentnum = input.nextint();
 
 //selected用来保存客户选中了什么车型，以及每种车型的辆数，与car数组是对应关系
 int[] selected = new int[6];
 
 for (int i = 1; i <= rentnum; i++){
 system.out.println("请输入第" + i + "种车型的序号：" );
 int nums = input.nextint() - 1;
 system.out.println(cars[nums].getbrand() +"总共需要多少辆：");
 int num = input.nextint();
 selected[nums] = num;
 }
 
 system.out.println("请输入租车天数：");
 int daysnum = input.nextint();
 
 system.out.println("您的账单：--------------------------");
 double total = 0;
 for (int i = 0; i < cars.length; i++){
 if (selected[i] !=0 ){
 system.out.println(selected[i] + "辆" + cars[i].getbrand() +
 " 总共载客量:"+selected[i]*cars[i].getpersoncapacity()+"人"+
 " 总共载货量:"+selected[i]*cars[i].getgoodcapacity()+"吨"+
 " "+daysnum+"天单项费用:"+selected[i]*cars[i].getfee()*daysnum+"元");
 total += selected[i]*cars[i].getfee()*daysnum;
 }
 }
 system.out.println("租车总费用：" + total + "元" + "\n" + "欢迎下次光临！------------------------");
 }
}

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