交作业！大家来交流交流，提提意见
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
