求教

//汽车父类，设置成了抽象类
public abstract class Qiche {
	private int num;
	private int dun;
	private int ren;
	private String name;
	private double price;
	
	public abstract void test();
	
	public int getNum() {
		return num;
	}
	public void setNum(int num) {
		this.num = num;
	}
	public int getDun() {
		return dun;
	}
	public void setDun(int dun) {
		this.dun = dun;
	}
	public int getRen() {
		return ren;
	}
	public void setRen(int ren) {
		this.ren = ren;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}
}

//载人汽车类
public class Car extends Qiche {
	public Car(int num,String name,int ren,double price) {
		setNum(num);
		setRen(ren);
		setName(name);
		setPrice(price);
	}
	@Override
	public void test() {
		System.out.println(getNum()+".	"+getName()+"	"+getRen()+"人	"+getPrice()+"\天");
	}
}

//载重汽车类
public class Huoche extends Qiche {
	public Huoche(int num,String name,int dun,double price) {
		setNum(num);
		setDun(dun);
		setName(name);
		setPrice(price);
	}

	@Override
	public void test() {
		System.out.println(getNum()+".	"+getName()+"	"+getDun()+"吨	"+getPrice()+"\天");
	}
}

//皮卡类
public class Pika extends Qiche {
	
	public Pika(int num,String name,int ren,int dun,double price) {
		setNum(num);
		setRen(ren);
		setDun(dun);
		setName(name);
		setPrice(price);
	}

	@Override
	public void test() {
		System.out.println(getNum()+".	"+getName()+"	"+getRen()+"人\"+getDun()+"吨"+"	"+getPrice()+"\天");
	}	
}

测试类
import java.util.Scanner;
public class Ceshi {

	Scanner console = new Scanner(System.in);
	Qiche[] qcs = {new Car(1,"奔驰",5,200),new Car(2,"大巴",40,500),new Huoche(3,"三轮",2,100),
			new Huoche(4,"重卡",20,1000),new Pika(5,"皮卡",4,2,800)};
	public void neirong() {
		System.out.println("欢迎使用达达租车系统！");
		System.out.println("是否要使用达达租车系统 （1：是；0：否）：");
		int xuanze = console.nextInt();
		if(xuanze==1) {
			System.out.println("可供选择的车型、载客载重以及价格表：");
			System.out.println("序号"+"	"+"名称	"+"载人\载重"+"价格");
			for (Qiche qiche : qcs) {
				qiche.test();
			}
			System.out.println("请选择您的租车数量：");
			int zucheNum = console.nextInt();
			Qiche[] qcs2 = new Qiche[zucheNum];
			for(int i = 1;i<=zucheNum;i++) {
				System.out.println("请输入您要租的第"+i+"辆车的序号：");
				int xuhao = console.nextInt();
				qcs2[i-1]=qcs[xuhao-1];
			}
			System.out.println("请输入您的租车天数：");
			int days = console.nextInt();
			System.out.println("您的账单：");
			int zairen = 0;
			int zaizhong = 0;
			double prices = 0;
			System.out.print("**可载人的车有：");
			for (Qiche qiche : qcs2) {
				if(qiche instanceof Car || qiche instanceof Pika) {
					zairen += qiche.getRen();
					prices += qiche.getPrice();
					System.out.print(qiche.getName()+"");
				}
			}
			System.out.print("可载人"+zairen+"人"+"
");
			System.out.print("**可载重的车有：");
			for (Qiche qiche : qcs2) {
				if(qiche instanceof Huoche || qiche instanceof Pika){
					zaizhong += qiche.getDun();
					prices += qiche.getPrice();
					System.out.print(qiche.getName()+"");
				}
			}
			System.out.print("可载重"+zaizhong+"吨"+"
");
			System.out.println("**租车总价格："+prices*days+"元");
			System.out.println("感谢您的使用。再见！");
		} else {
			System.out.println("感谢您的使用。再见！");
		}
		
	}
	
	public static void main(String[] args) {
		Ceshi cs = new Ceshi();
		cs.neirong();
	}		
}