新手入门，请各位同学和大神们多多指导。
目前只使用到了继承，多态，对于main中的数组这块研究了一晚上，还有点模糊。期间参考了几位同学的写的代码，自己总结了下，代码如下；
父类car

public class Car {//客车涉及的参数 名称 价格 载人数  载货数
     public String name;
     public double price;
     public int manned;
     public double cargo;
     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;
    }
    public int getManned() {
        return manned;
    }
    public void setManned(int manned) {
        this.manned = manned;
    }
    public double getCargo() {
        return cargo;
    }
    public void setCargo(int cargo) {
        this.cargo = cargo;
    }

}

客车

public class PassengerCar extends Car {//客车的 属性和构造函数
    private String name;
    private int manned;
    private double price;
    public  PassengerCar(String name,int manned,int price){
        this.name=name;
        this.manned=manned;
        this.price=price;       
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getManned() {
        return manned;
    }
    public void setManned(int manned) {
        this.manned = manned;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "小汽车 [名称=" + name + ", 载人数=" + manned + ", 价格="
                + price + "]";
    }

}

皮卡

public class Pickup extends Car {//皮卡属性
    private String name;
    private int manned;
    private double price;
    private double cargo;
    public  Pickup(String name,double cargo,double price,int manned){
        this.name=name;
        this.manned=manned;
        this.price=price;
        this.cargo=cargo;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getManned() {
        return manned;
    }

    public void setManned(int manned) {
        this.manned = manned;
    }

    public double getPrice() {
        return price;
    }

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

    public double getCargo() {
        return cargo;
    }

    public void setCargo(double cargo) {
        this.cargo = cargo;
    }

    @Override
    public String toString() {
        return "皮卡 [名称=" + name + ", 载人=" + manned + ", 价格="
                + price + ", 载重=" + cargo + "]";
    }   
}

货车

public class Truck extends Car {//货车的属性和构造函数
    private String name;
    private double cargo;
    private double price;
    public  Truck(String name,double cargo,double price){
        this.name=name;
        this.cargo=cargo;
        this.price=price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getCargo() {
        return cargo;
    }

    public void setCargo(double cargo) {
        this.cargo = cargo;
    }

    public double getPrice() {
        return price;
    }

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

    @Override
    public String toString() {
        return "货车 [名称=" + name + ", 载重=" + cargo + ", 价格="
                + price + "]";
    }
}

主函数

import java.util.*;
//import java.
public class Initail {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("欢迎使用答答租车系统");
        System.out.println("您是否需要租车：1 是，0 否");
        Scanner sc=new Scanner(System.in);
        int input1=sc.nextInt();//获取输入的值
        if (input1==0) {//判断值如果为1 操作 遍历显示所有的车型 ，判断需求的车辆数量 天数 和载重 ，统计total
            System.out.println("谢谢");
        }else if (input1==1) {
            Car[] cars={new PassengerCar("奥迪A4",5,500), 
                    new Truck("小货车",5,150),
                    new PassengerCar("奔驰E400",5,700),
                    new Pickup("皮卡",1.5,200,4), 
                    new Truck("大型货车",600,10), 
                    new PassengerCar("大客车",25,650)}; 
            for(int i=0;i0&&input20) {
                    double sumpri=0;
                    double sumico=0;
                    int sumper=0;
                    sumpri=input4*totalprice;
                    sumico=input4*totalicargo;
                    sumper=input4*totalper;
                    System.out.println("您的账单如下");
                    System.out.println("总价格"+sumpri+"总载重"+sumico+"总载人"+sumper);
                }else {
                    System.out.println("输入有误");
                    sc.close();
                }

        }
    }
}

以上就是，这是运行结果

现在是主要是去完善这个代码，如何利用上接口和优化下主函数 ，父类如果用抽象类的话这么写，我的再想想，请各位大神指点。