刚做出来的，感觉类和对象还是不大会设计。请老师多提提改进的方法。
package student.carcental;
/**
* 车类 --抽象类
*/
public abstract class Car {
private String carName; //车的名
private int carNum; //车编号
private int carRent; //车租金
public String getCarName() {
return carName;
}
public void setCarName(String carName) {
this.carName = carName;
}
public int getCarNum() {
return carNum;
}
public void setCarNum(int carNum) {
this.carNum = carNum;
}
public int getCarRent() {
return carRent;
}
public void setCarRent(int carRent) {
this.carRent = carRent;
}
}package student.carcental;
/**
* 货车类
*/
public class Truck extends Car {
private int cargoNum; //载货量
public Truck(String carName,int carRent,int cargoNum){ //构造方法
this.setCarName(carName);
this.setCarRent(carRent);
this.setCargoNum(cargoNum);
}
public int getCargoNum() {
return cargoNum;
}
public void setCargoNum(int cargoNum) {
this.cargoNum = cargoNum;
}
}package student.carcental;
/**
* 客车类
*/
public class Passengercar extends Car {
private int capacity; //载客量
public Passengercar(String carName,int carRent,int capacity){
this.setCarName(carName);
this.setCarRent(carRent);
this.setCapacity(capacity);
}
public int getCapacity() {
return capacity;
}
public void setCapacity(int capacity) {
this.capacity = capacity;
}
}package student.carcental;
/**
* 皮卡类
*/
public class Pickup extends Car {
private int capacity; //载客量
private int cargoNum; //载货量
public Pickup(String carName,int carRent,int capacity,int cargoNum){
this.setCarName(carName);
this.setCarRent(carRent);
this.setCargoNum(cargoNum);
this.setCapacity(capacity);
}
public int getCapacity() {
return capacity;
}
public void setCapacity(int capacity) {
this.capacity = capacity;
}
public int getCargoNum() {
return cargoNum;
}
public void setCargoNum(int cargoNum) {
this.cargoNum = cargoNum;
}
}package student.carcental;
import java.util.Arrays;
/**
* 车辆管理类 增删查存储
* 1。货车 2.客车 3.皮卡
*/
public class CarManager {
private Car[] carSave = new Car[3]; //数组对象
private int count=0; //存储数据数
public static Car getInstance(int carNum,String carName,int carRent,int...loadBearing){ //初始化类
if(carNum==1){
return new Truck(carName,carRent,loadBearing[0]);
}else if(carNum==2){
return new Passengercar(carName,carRent,loadBearing[0]);
}else if(carNum==3){
return new Pickup(carName,carRent,loadBearing[0],loadBearing[1]);
}
return null;
}
public void addCar(Car car){ //增加
//判断是否超出长度,扩充数组
if(count>=carSave.length){
int newLen = (carSave.length*3)/2 +1;
carSave = Arrays.copyOf(carSave, newLen);
}
if(!searchCar(car.getCarName())){ //判断是否存在此车型
//存在时
System.out.println(car.getCarName()+"此车型已经存在");
}else{
//不存在
car.setCarNum(count+1);
carSave[count] = car;
count++;
}
}
public void delCar(String carName){ //删除
int index = searchCarNum(carName);
if(index != -1){
for (int i = index; i < count-1; i++) {
carSave[i]=carSave[i+1];
carSave[i].setCarNum(i+1); //重置序号
}
carSave[count-1]=null;
count--;
}else{
System.out.println("车型不存在");
}
}
public void showCar(){ //显示
for (Car car:carSave) {
if(car!=null){
System.out.print(car.getCarNum()+";\t");
System.out.print(car.getCarName()+";\t");
if (car instanceof Truck) {
System.out.print("载货:"+((Truck) car).getCargoNum()+"吨;\t\t");
}
if (car instanceof Passengercar) {
System.out.print("载人:"+((Passengercar) car).getCapacity()+"人;\t\t");
}
if (car instanceof Pickup) {
System.out.print("载货:"+((Pickup) car).getCargoNum()+"吨\\");
System.out.print("载人:"+((Pickup) car).getCapacity()+"人;\t");
}
System.out.print(car.getCarRent()+";\t");
System.out.println();
}
}
}
public boolean searchCar(String carName){ //查询
for (int i = 0; i < count; i++) {
if(carName.equals(carSave[i].getCarName())){
return false;
}
}
return true;
}
public int searchCarNum(String carName){ //查询id
for (int i = 0; i < count; i++) {
if(carName.equals(carSave[i].getCarName())){
return i;
}
}
return -1;
}
public Car returnCar(int carNum){ //返回车对象
return carSave[carNum];
}
}package student.carcental;
/**
* 租车管理接口
*/
public interface IRentalManager {
public void rentaldata(); //租车数据
public void totalList(); //租车统计
}package student.carcental;
import java.util.Iterator;
import java.util.Scanner;
/**
* 个人租赁类
*/
public class PersonRental implements IRentalManager {
public void rentaldata(){
System.out.println("欢迎使用答答租车系统");
Scanner in = new Scanner(System.in);
System.out.println("你是否要租车？1.是 0.否");
int input = in.nextInt();
if (input==1) {
System.out.println("可租车辆清单");
System.out.println("序号\t"+"汽车名称\t"+"容量\t\t"+"租金");
//租车清单
CarManager cm = new CarManager();
cm =new StartData().startData(cm);
cm.showCar();
System.out.println("请输入租车的数量:");
int rentalNum = in.nextInt();
//租的车辆
int[] carArrays = new int[rentalNum];
for (int i = 0; i < carArrays.length; i++) {
System.out.println("请输入要租"+(i+1)+"号车的序号");
carArrays[i]=in.nextInt()-1;//和存储的车的序号对其来
}
System.out.println("请输入天数:");
int days = in.nextInt();
totalList(carArrays, days, cm);
}else if(input==0){
System.out.println("感谢使用答答租车系统.");
}else{
System.out.println("输入信息错误！");
}
}
public void totalList(){
}
public void totalList(int[] ca,int day,CarManager cm){
int total=0; //总额
String passengercar=""; //可载人的车
String truck=""; //可载货的车
for (int i = 0; i < ca.length; i++) {
Car car = cm.returnCar(ca[i]);
total+=car.getCarRent()*day;
if(car instanceof Truck){
if(truck.indexOf(car.getCarName()+";")==-1){
truck=truck.concat(car.getCarName()+";");
}
}
if(car instanceof Passengercar){
if(passengercar.indexOf(car.getCarName()+";")==-1){
passengercar=passengercar.concat(car.getCarName()+";");
}
}
if(car instanceof Pickup){
if(passengercar.indexOf(car.getCarName()+";")==-1){
passengercar=passengercar.concat(car.getCarName()+";");
}
if(truck.indexOf(car.getCarName()+";")==-1){
truck=truck.concat(car.getCarName()+";");
}
}
}
System.out.println("可载人的车辆有:");
System.out.println(passengercar);
System.out.println("可载货的车辆有:");
System.out.println(truck);
System.out.println("总金额");
System.out.println(total);
}
}package student.carcental; /** * * 滴滴租车系统 * 1.展示所有可租车辆 * 2.选择车型、租车量 * 3.展示租车清单，包含：总金额、总载货量、总载人量及车型 * */
public class ShowMain {
public static void main(String[] args){
IRentalManager p = new PersonRental();
p.rentaldata();
}
}请老师和同学多提意见。刚开始学习java，面向对象老是觉得分析起来困难
