一个控制台输出的租车程序，不好的地方还望指出

2 import java.util.Scanner;

/**
 * Created by Void on 2017/6/26.
 */
public class CarDemo {
    public static void main(String[] args){
        Car cars[] = new Car[]{
                new CarModelsKeche("奥迪A4", 500, 4),
                new CarModelsKeche("马自达6", 400, 4),
                new CarModelsKeche("金龙", 1500, 20),
                new CarModelsHuoche("大力神", 6500, 200),
                new CarModelsHuoche("解放130", 1000, 30),
                new CarModelsPika("猛禽", 1000, 4, 5),
                new CarModelsPika("坦途", 1000, 4, 6)};
        System.out.println("********欢迎来到“我要租车”系统********");
        System.out.println("********请问是否需要租车？********");
        System.out.println("********是请选择(1)，否请选择(2)********");
        Scanner sc = new Scanner(System.in);
        if (sc.nextInt() == 1) {
            System.out.println("********您可以租用的车型以及价目表如下********");
            System.out.println("序号	车型		价格(元/天)		容量");
            for (int i = 0; i < cars.length; i++) {
                System.out.println((i + 1) + "		" + cars[i]);
            }
            System.out.println("********您要租几辆车********");
            float zongJia = 0;
            int zongRen = 0;
            float zongZhong = 0;
            String laRen = "";
            String laHuo = "";
            int temp = 0;
            int a = sc.nextInt();
            for (int i = 1; i <= a; i++) {
                System.out.println("********请输入第" + i + "辆车的序号********");
                int b = sc.nextInt();
                System.out.println("********您要租的车型为" + cars[b - 1].carName + "********");
                System.out.println("********确认选(1)，重新选(2)********");
                temp = i;
                i = getSelect(sc, i);
                if (i < temp)
                    continue;

                System.out.println("********您要租用几天？********");
                int c = sc.nextInt();
                zongJia = cars[b - 1].money * c+zongJia;
                zongRen = cars[b - 1].zairen+zongRen;
                zongZhong = cars[b - 1].zaihuo+zongZhong;
                if ((cars[b - 1].zairen) != 0) {
                    laRen = cars[b - 1].carName;
                }
                if ((cars[b - 1].zairen) >= 0) {
                    laHuo = cars[b - 1].carName;
                }

            }
            System.out.println("******您的账单如下******");
            System.out.println("载客的车有：");
            System.out.println(laRen + "	总人数为：" + zongRen);
            System.out.println("载货的车有：");
            System.out.println(laHuo + "	总重量为：" + zongZhong);
            System.out.println("总价格为：" + zongJia);
            System.out.println("******是否确认支付" + zongJia + "元进行租车？******");
            System.out.println("******是(1)	否(2)******");
            if (sc.nextInt() == 1) {
                System.out.println("******您已成功支付" + zongJia + "元进行租车，祝您生活愉快！******");
            } else
                System.out.println("*****您已成功取消本次租车。欢迎下次光临******");
            System.out.println("*****欢迎下次光临******");
            return;
        }
    }
    private static int getSelect(Scanner sc, int i) {
        int d = sc.nextInt();
        switch (d){
            case 1:
                return i;
            case 2:
                i--;
                return i;
            default: System.out.println("********输入错误,请重新输入********");
               return getSelect(sc,i);
        }
    }
}

public abstract class Car {
    public String carName;
    public float  money;  
    public int zairen;    
    public float  zaihuo;  
}

public class CarModelsHuoche extends Car{
    public CarModelsHuoche(String carName ,float  money , float  zaihuo){
        this.carName = carName;
        this.money = money;
        this.zaihuo = zaihuo;
    }
    public String toString(){
        return (carName+"		"+money+"			"+"吨: "+zaihuo);
    }
}

public class CarModelsKeche extends Car{
    public CarModelsKeche(String carName,float money,int zairen){
        this.carName = carName;
        this.money = money;
        this.zairen = zairen;
    }
    @Override
    public String toString(){
        return (carName+"		"+money+"			"+"载客量: "+zairen);
    }
}

public class CarModelsPika extends Car{
    public CarModelsPika(String carName ,float  money ,int zairen, float  zaihuo ){
        this.carName = carName;
        this.money = money;
        this.zaihuo = zaihuo;
        this.zairen = zairen;
    }
    public String toString(){
        return (carName+"		"+money+"			"+"载人数: "+zairen+"	"+"吨位:"+zaihuo);
    }
}

感觉还可以优化，等学到更多的东西后，再回来优化一下代码