这个小项目是学完java面相对象的练习小项目，还有很多知识点没有用上，是因为并没有完全吸收所学的知识。粗略的完成了这个小项目希望大家指点！

创建Car父类
package com.car;

public class Car {
    private String type;
    private int index;
    private int price;
    private int capacity;

    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public int getIndex() {
        return index;
    }
    public void setIndex(int index) {
        this.index = index;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public int getCapacity() {
        return capacity;
    }

    public void setCapacity(int capacity) {
        this.capacity = capacity;
    }

    public Car(){

    }

    public Car(String type,int index,int price,int capacity){
        this.setType(type);
        this.setIndex(index);
        this.setPrice(price);
        this.setCapacity(capacity);
    }

}

创建轿车子类并继承Car父类
package com.car;
public class smallCar extends Car {

}

创建货车子类并继承Car父类
package com.car;
public class Truck extends Car {

}

创建皮卡子类并继承Car父类
package com.car;
public class Pickup extends Car {

}

测试主程序
package com.car;
import java.util.Scanner;

public class Test {

    public static void main(String[] args) {
        //欢迎语
        System.out.println("欢迎来到答答租车系统！\n您是否要租车：1是 0否");

        //输入工具
        Scanner input=new Scanner(System.in);

        //判断用户是否需要租车
        if(input.nextInt()!=1){
            return;
        }

        //展示清单
        System.out.println("您可以租的车型及价格表！");

        //初始化对象长度
        Car [] cars=new Car[6];

        //定义数组存放汽车类型
        String [] type={
                "奥迪a4",
                "马自达6",
                "皮卡",
                "金龙",
                "松花江",
                "依维柯"
        };

        //定义数组存放汽车价格
        int [] price={
                500,
                400,
                450,
                800,
                400,
                1000
        };

        //定义数组存放汽车容量
        int [] capacity={
                4,
                4,
                4,
                20,
                4,
                20
        };

        //定义循环变量
        int i=0;

        //打印表格
        System.out.println("类型"+"  "+"序号"+"  "+"金额"+"  "+"容量");

        //循环实例化对象并为属性赋值以及显示表格的内容
        while(i<cars.length){
            cars[i]=new Car(type[i],i,price[i],capacity[i]);

            System.out.println(
                    type[i]+"  "+
                    i+"  "+
                    price[i]+"  "+
                    capacity[i]
                            );

            i++;
        }

        System.out.println("请输入您要租汽车的序号：");
        int index=input.nextInt();

        System.out.println("请输入您要租汽车的数量：");
        int num=input.nextInt();

        System.out.println("请输入您要租汽车的天数：");
        int day=input.nextInt();

        String carName=null; int carCount=0; int dayCount=0; int priceCount=0;
        int capCount=0;

        carName=type[index];
        carCount+=num;
        dayCount+=day;
        priceCount=(price[index]*carCount)*dayCount;
        capCount+=carCount*capacity[index];

        System.out.println(
                "您要租的汽车为："+carName+"  "+
                "数量为："+carCount+"  "+
                "天数为："+dayCount+"  "+
                "金额为："+priceCount+"  "+
                "总容量为："+capCount
                );

        System.out.println("");

        System.out.println("感谢您使用答答租车服务，欢迎您的再次光临！");
    }

}