交作業(yè)！大家來交流交流，提提意見
測試類
import?java.util.Scanner;
public?class?Play?{
????public?static?void?main(String[]?args)?{
????????Car?car1?=?new?Truck("貨車1號",?100,?4);
????????Car?car2?=?new?Truck("貨車2號",?200,?15);
????????Car?car3?=?new?MannedCar("客車1號",?300,?15);
????????Car?car4?=?new?MannedCar("客車2號",?400,?4);
????????Car?car5?=?new?PickupTruck("皮卡車1號",?400,?2,4);
????????Car?car6?=?new?PickupTruck("皮卡車2號",?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("歡迎使用嗒嗒租車系統(tǒng)：");
????????System.out.println("您是否要租車：1是?0否");
????????Scanner?scanner?=?new?Scanner?(?System.in?);
????????int?yes_no?=?scanner.nextInt?();
????????if?(yes_no?==?1)?{
????????????System.out.println?(?"您可以租車的類型及價目表:"?);
????????????System.out.println?(?"序號?名稱????租金?????容量"?);
????????????for?(int?i?=?0;?i?<?cars.length;?i++)?{
????????????????System.out.print?(?i?+?1?+?".???"?);
????????????????cars[i].show?();
????????????}
????????????//eg1.foreeach遍歷
????????????/*for?(Car?car?:?cars)?{
???????????????????car.show?();
????????????}*/
????????????//eg2.while遍歷
????????????/*int?i?=?0;
????????????while(i<cars.length){
????????????????cars[i].show();
????????????????i++;
????????????}*/
????????????System.out.print?(?"請輸入您要租汽車的數(shù)量:?"?);
????????????int?lease?=?scanner.nextInt?();
????????????//生成儲存租借汽車的數(shù)組
????????????Car[]?zcar?=?new?Car[lease];//zcar數(shù)組長度取決于用戶輸入的lease變量值
????????????for?(int?n?=?1;?n?<?lease?+?1;?n++)?{
????????????????System.out.print?(?"請輸入第"?+?n?+?"車的序列號:?"?);
????????????????int?serial?=?scanner.nextInt?();
????????????????zcar[n-1]?=?cars[serial-1];//把cars數(shù)組中[serial-1]傳入zcar數(shù)組中[n-1]去
????????????}
????????????//測試zcar（租借車輛數(shù)組）
????????????/*for?(int?i?=?0;?i<lease;?i++){
????????????????zcar[i].show?();
????????????}*/
????????????//day變量存儲輸入天數(shù)
????????????System.out.print?(?"請輸入租車的天數(shù):?"?);
????????????int?day?=?scanner.nextInt?();
????????????//遍歷篩選載人汽車
????????????System.out.println?("***可載人的汽車有:?");
????????????for?(int?i?=?0;?i<lease;?i++){
????????????????if?(zcar[i].manned?!=?0){
????????????????????System.out.print?(zcar[i].name?+?"?");
????????????????}
????????????}
????????????//遍歷篩選載貨汽車
????????????System.out.println?();
????????????System.out.println?("***可載貨的汽車有:?");
????????????for?(int?i?=?0;?i<lease;?i++){
????????????????if?(zcar[i].goods?!=?0){
????????????????????System.out.print?(zcar[i].name?+?"?");
????????????????}
????????????}
????????????//計算總價格
????????????System.out.println?();
????????????System.out.println?("***租車總價格為:?");
????????????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，再見");
????????????System.exit?(?0?);
????????}
????}
}Car類（父類）
public?class?Car?{
????public?String?name;
????public?int?price;
????public?int?goods;
????public?int?manned;
????public?void?show(){
????}
}Truck類（子類）
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?"?+"載貨:"??+?goods?+?"噸"?);
????}
????//沒用的
????/*public?int?getGoods()?{
????????return?goods;
????}
????public?void?setGoods(int?goods)?{
????????this.goods?=?goods;
????}*/
}MannedCar類（子類）
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?"?+"載人:"??+?manned?+?"人"?);
????}
????public?int?getManned()?{
????????return?manned;
????}
????public?void?setManned(int?manned)?{
????????this.manned?=?manned;
????}
}PickupTruck類（子類）
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?"?+"載人:"??+?manned?+?"人"?+?"?載貨:"?+?goods?+?"噸");
????}
????//沒用的
????/*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;
????}*/
}這個abstract類到底怎么用，改來改去都不行，還有其他的地方有沒有什么錯誤哈，互相交流交流
2018-10-27
注意要體現(xiàn)程序的持續(xù)性，程序需要一直運行，不是說一個客人交易完后就結(jié)束了，還要讓程序繼續(xù)下去，這時候需要在main里面使用while(){}，把代碼都寫進while()里。
2018-09-24
我的代碼 用到了abstract類和接口 供你參考
public interface IZaiRen {
?? void zaiRen();}
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("? 載人："+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("? 載貨："+capacityStuff+"噸 ");
?? }
? ?
?? 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("? 載人："+capacityPerson+"人 ");
?? }
? ?
?? public void zaiHuo() {
?? ??? System.out.print("? 載貨："+capacityStuff+"噸 ");
?? }
? ?
?? 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("歡迎使用答答租車系統(tǒng)：");
?? ??? ?System.out.println("您是否要租車：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("您可租車的類型及其價目表：");
?? ??? ?System.out.println("序號? 汽車名稱????? 租金????????? 容量");
?? ??? ?Car cars[] =new Car[6];
?? ??? ?String pcars[]=new String[6];
?? ??? ?String scars[]=new String[6];
?? ??? ?
?? ??? ?cars[0]=new PersonCar(1,"奧迪A4",500,4);
?? ??? ?cars[1]=new PersonCar(2,"馬自達6",400,4);
?? ??? ?cars[2]=new PersonStuffCar(3,"皮卡雪??? ",450,4,2);
?? ??? ?cars[3]=new PersonCar(4,"金龍???? ",800,20);
?? ??? ?cars[4]=new StuffCar(5,"松花江?? ",400,4);
?? ??? ?cars[5]=new StuffCar(6,"依維柯?? ",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("請輸入您要租汽車的數(shù)量");
?? ??? ?int num=scanner.nextInt();
?? ??? ?for (int i=1;i<=num;i++) {
?? ??? ??? ?System.out.println("請輸入第"+i+"量車的序號");
?? ??? ??? ?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("請輸入租車天數(shù)：");
?? ??? ?totalPrice*=scanner.nextInt();
?? ??? ?System.out.println("您的賬單:");
?? ??? ?System.out.println("***可載人的車有：");
?? ??? ?for (String s:pcars) {
?? ??? ??? ?if(s!=null)
?? ??? ??? ??? ?System.out.print(s+"? ");
?? ??? ?}
?? ??? ?System.out.println("共載人："+totalPersonC+"人");
?? ??? ?
?? ??? ?System.out.println("***可載貨的車有：");
?? ??? ?for (String s:scars) {
?? ??? ??? ?if(s!=null)
?? ??? ??? ??? ?System.out.print(s+"? ");
?? ??? ?}
?? ??? ?System.out.println("共載貨："+totalStuffC+"噸");
?? ??? ?
?? ??? ?System.out.println("***租車總價格："+totalPrice+"元");
?? ??? ?
?? ?}
}