测试类
import java.util.Scanner;
public class Play {
public static void main(String[] args) {
Car car1 = new Truck("货车1号", 100, 4);
Car car2 = new Truck("货车2号", 200, 15);
Car car3 = new MannedCar("客车1号", 300, 15);
Car car4 = new MannedCar("客车2号", 400, 4);
Car car5 = new PickupTruck("皮卡车1号", 400, 2,4);
Car car6 = new PickupTruck("皮卡车2号", 500, 3,2);
Car[] cars = new Car[6];
cars[0] = car1;
cars[1] = car2;
cars[2] = car3;
cars[3] = car4;
cars[4] = car5;
cars[5] = car6;
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 scanner = new Scanner ( System.in );
int yes_no = scanner.nextInt ();
if (yes_no == 1) {
System.out.println ( "您可以租车的类型及价目表:" );
System.out.println ( "序号 名称 租金 容量" );
for (int i = 0; i < cars.length; i++) {
System.out.print ( i + 1 + ". " );
cars[i].show ();
}
//eg1.foreeach遍历
/*for (Car car : cars) {
car.show ();
}*/
//eg2.while遍历
/*int i = 0;
while(i<cars.length){
cars[i].show();
i++;
}*/
System.out.print ( "请输入您要租汽车的数量: " );
int lease = scanner.nextInt ();
//生成储存租借汽车的数组
Car[] zcar = new Car[lease];//zcar数组长度取决于用户输入的lease变量值
for (int n = 1; n < lease + 1; n++) {
System.out.print ( "请输入第" + n + "车的序列号: " );
int serial = scanner.nextInt ();
zcar[n-1] = cars[serial-1];//把cars数组中[serial-1]传入zcar数组中[n-1]去
}
//测试zcar（租借车辆数组）
/*for (int i = 0; i<lease; i++){
zcar[i].show ();
}*/
//day变量存储输入天数
System.out.print ( "请输入租车的天数: " );
int day = scanner.nextInt ();
//遍历筛选载人汽车
System.out.println ("***可载人的汽车有: ");
for (int i = 0; i<lease; i++){
if (zcar[i].manned != 0){
System.out.print (zcar[i].name + " ");
}
}
//遍历筛选载货汽车
System.out.println ();
System.out.println ("***可载货的汽车有: ");
for (int i = 0; i<lease; i++){
if (zcar[i].goods != 0){
System.out.print (zcar[i].name + " ");
}
}
//计算总价格
System.out.println ();
System.out.println ("***租车总价格为: ");
int moneny = 0;
for (int i = 0; i<lease;i++){
moneny += zcar[i].price * day;
}
System.out.println (moneny + "元");
}else {
System.out.println ("好的，再见");
System.exit ( 0 );
}
}
}Car类（父类）
public class Car {
public String name;
public int price;
public int goods;
public int manned;
public void show(){
}
}Truck类（子类）
public class Truck extends Car{
//private int goods;
public Truck(String newName,int newPrice,int newgoods){
name = newName;
price = newPrice;
goods = newgoods;
}
public void show(){
System.out.println ( name + " " + price + "元/天 " +"载货:" + goods + "吨" );
}
//没用的
/*public int getGoods() {
return goods;
}
public void setGoods(int goods) {
this.goods = goods;
}*/
}MannedCar类（子类）
public class MannedCar extends Car{
//private int manned;
public MannedCar(String newName,int newPrice,int newManned){
name = newName;
price = newPrice;
manned = newManned;
}
public void show(){
System.out.println ( name + " " + price + "元/天 " +"载人:" + manned + "人" );
}
public int getManned() {
return manned;
}
public void setManned(int manned) {
this.manned = manned;
}
}PickupTruck类（子类）
public class PickupTruck extends Car{
//private int goods;
//private int manned;
public PickupTruck(String newName,int newPrice,int newGoods,int newManned){
name = newName;
price = newPrice;
goods = newGoods;
manned = newManned;
}
public void show(){
System.out.println ( name + " " + price + "元/天 " +"载人:" + manned + "人" + " 载货:" + goods + "吨");
}
//没用的
/*public int getGoods() {
return goods;
}
public int getManned() {
return manned;
}
public void setGoods(int goods) {
this.goods = goods;
}
public void setManned(int manned) {
this.manned = manned;
}*/
}这个abstract类到底怎么用，改来改去都不行，还有其他的地方有没有什么错误哈，互相交流交流
注意要体现程序的持续性，程序需要一直运行，不是说一个客人交易完后就结束了，还要让程序继续下去，这时候需要在main里面使用while(){}，把代码都写进while()里。
我的代码 用到了abstract类和接口 供你参考
public interface IZaiRen {
}
public interface IZaiHuo {
void zaiHuo();
}
public interface IDouZai extends IZaiHuo, IZaiRen {
}
public abstract class Car {
public int number;
public String carName;
public int price;
public String carType ;
public abstract void print();
}
public class PersonCar extends Car implements IZaiRen {
public int capacityPerson;
public PersonCar(int number,String carName,int price,int capacityPerson) {
this.number=number;
this.carName=carName;
this.price=price;
this.capacityPerson=capacityPerson;
carType = "PersonCar";
}
public void zaiRen() {
System.out.print(" 载人："+capacityPerson+"人 ");
}
public void print() {
System.out.print(number+". "+carName+" "+price+"元/天 ");
this.zaiRen();
}
}
public class StuffCar extends Car implements IZaiHuo {
public int capacityStuff;
public StuffCar(int number,String carName,int price,int capacityStuff) {
this.number=number;
this.carName=carName;
this.price=price;
this.capacityStuff=capacityStuff;
carType = "StuffCar";
}
public void zaiHuo() {
System.out.print(" 载货："+capacityStuff+"吨 ");
}
public void print() {
System.out.print(number+". "+carName+" "+price+"元/天 ");
this.zaiHuo();;
}
}
public class PersonStuffCar extends Car implements IDouZai {
public int capacityPerson;
public int capacityStuff;
public PersonStuffCar(int number,String carName,int price,int capacityPerson,int capacityStuff) {
this.number=number;
this.carName=carName;
this.price=price;
this.capacityPerson=capacityPerson;
this.capacityStuff=capacityStuff;
carType = "PersonStuffCar";
}
public void zaiRen() {
System.out.print(" 载人："+capacityPerson+"人 ");
}
public void zaiHuo() {
System.out.print(" 载货："+capacityStuff+"吨 ");
}
public void print() {
System.out.print(number+". "+carName+" "+price+"元/天 ");
this.zaiRen();
this.zaiHuo();
}
}
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
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");
Scanner scanner = new Scanner(System.in);
int sellect = scanner.nextInt();
if (sellect==0)
return;
int totalPersonC = 0;
int totalStuffC = 0;
int totalPrice = 0;
int pCarNum=0;
int sCarNum=0;
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 容量");
Car cars[] =new Car[6];
String pcars[]=new String[6];
String scars[]=new String[6];
cars[0]=new PersonCar(1,"奥迪A4",500,4);
cars[1]=new PersonCar(2,"马自达6",400,4);
cars[2]=new PersonStuffCar(3,"皮卡雪 ",450,4,2);
cars[3]=new PersonCar(4,"金龙 ",800,20);
cars[4]=new StuffCar(5,"松花江 ",400,4);
cars[5]=new StuffCar(6,"依维柯 ",1000,20);
for(Car a : cars) {
a.print();
System.out.println("");
//System.out.print(a instanceof PersonCar);
//System.out.print(a instanceof StuffCar);
//System.out.print(a instanceof PersonStuffCar);
}
System.out.println("请输入您要租汽车的数量");
int num=scanner.nextInt();
for (int i=1;i<=num;i++) {
System.out.println("请输入第"+i+"量车的序号");
int n = scanner.nextInt();
totalPrice+=cars[n-1].price;
switch (cars[n-1].carType) {
case "PersonCar":pCarNum+=1;
pcars[pCarNum]=cars[n-1].carName;
totalPersonC+=((PersonCar)cars[n-1]).capacityPerson;
break;
case "StuffCar":sCarNum+=1;
scars[sCarNum]=cars[n-1].carName;
totalStuffC+=((StuffCar)cars[n-1]).capacityStuff;
break;
case "PersonStuffCar":
pCarNum+=1;
pcars[pCarNum]=cars[n-1].carName;
totalPersonC+=((PersonStuffCar)cars[n-1]).capacityPerson;
sCarNum+=1;
scars[sCarNum]=cars[n-1].carName;
totalStuffC+=((PersonStuffCar)cars[n-1]).capacityStuff;
}
}
System.out.println("请输入租车天数：");
totalPrice*=scanner.nextInt();
System.out.println("您的账单:");
System.out.println("***可载人的车有：");
for (String s:pcars) {
if(s!=null)
System.out.print(s+" ");
}
System.out.println("共载人："+totalPersonC+"人");
System.out.println("***可载货的车有：");
for (String s:scars) {
if(s!=null)
System.out.print(s+" ");
}
System.out.println("共载货："+totalStuffC+"吨");
System.out.println("***租车总价格："+totalPrice+"元");
}
}