第一次编这么长的程序，还花了俩个小时，有比我更复杂的算我输-原创手记-慕课网

先创建一个抽象类，里面定义名称、载客量、载货量、价格的抽象方法，然后给每辆车定义一个子类，返回值为他们各自的属性，最后在main方法中把所有属性加起来
首先是父类

package dada;

public abstract class Total {
    public abstract int zaiKe();
    public abstract int zaiHuo();
    public abstract int zuJin();
    public abstract String leiXing1();
    public abstract String leiXing2();
}

这些都是拼音，一下就看懂了，俩个类型是要把载客和载货分开，1是载客，2是载货

接下来是留个子类，就是把自己的属性返回，没有的属性就返回0

ackage dada;

public class Aodi extends Total {

    @Override
    public int zaiKe() {
        // TODO Auto-generated method stub
        return 4;
    }

    @Override
    public int zaiHuo() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int zuJin() {
        // TODO Auto-generated method stub
        return 500;
    }

    @Override
    public String leiXing1() {
        // TODO Auto-generated method stub
        return "奥迪A4   ";
    }

    @Override
    public String leiXing2() {
        // TODO Auto-generated method stub
        return null;
    }

package dada;

public class Jianglong extends Total {

    @Override
    public int zaiKe() {
        // TODO Auto-generated method stub
        return 20;
    }

    @Override
    public int zaiHuo() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int zuJin() {
        // TODO Auto-generated method stub
        return 800;
    }

    @Override
    public String leiXing1() {
        // TODO Auto-generated method stub
        return "江龙    ";
    }

    @Override
    public String leiXing2() {
        // TODO Auto-generated method stub
        return null;
    }

}

package dada;

public class Mazida extends Total {

    @Override
    public int zaiKe() {
        // TODO Auto-generated method stub
        return 4;
    }

    @Override
    public int zaiHuo() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int zuJin() {
        // TODO Auto-generated method stub
        return 400;
    }

    @Override
    public String leiXing1() {
        // TODO Auto-generated method stub
        return "马自达6   ";
    }

    @Override
    public String leiXing2() {
        // TODO Auto-generated method stub
        return null;
    }

}

package dada;

public class Pokaxue extends Total {

    @Override
    public int zaiKe() {
        // TODO Auto-generated method stub
        return 4;
    }

    @Override
    public int zaiHuo() {
        // TODO Auto-generated method stub
        return 2;
    }

    @Override
    public int zuJin() {
        // TODO Auto-generated method stub
        return 450;
    }

    @Override
    public String leiXing1() {
        // TODO Auto-generated method stub
        return "皮卡雪6   ";
    }

    @Override
    public String leiXing2() {
        // TODO Auto-generated method stub
        return "皮卡雪6   ";
    }

}

package dada;

public class Songhuajiang extends Total {

    @Override
    public int zaiKe() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int zaiHuo() {
        // TODO Auto-generated method stub
        return 4;
    }

    @Override
    public int zuJin() {
        // TODO Auto-generated method stub
        return 400;
    }

    @Override
    public String leiXing1() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String leiXing2() {
        // TODO Auto-generated method stub
        return "松花江     ";
    }

}

package dada;

public class Yiweihe extends Total {

    @Override
    public int zaiKe() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int zaiHuo() {
        // TODO Auto-generated method stub
        return 20;
    }

    @Override
    public int zuJin() {
        // TODO Auto-generated method stub
        return 1000;
    }

    @Override
    public String leiXing1() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String leiXing2() {
        // TODO Auto-generated method stub
        return "依维柯      ";
    }

}

最后是实现代码

package dada;
import java.util.Scanner;
public class Rental {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
    System.out.println("欢迎使用答答租车系统：\n您是否要租车：1是  0否");
    Scanner input=new Scanner(System.in);
    int a=input.nextInt();
    if(a==1){//租车系统开始
        System.out.println("您可租车的类型及其价目表");
        System.out.println("序号  汽车名称  租金           容量");
        System.out.println("1.   奥迪A4  500元/天   载人:4人" );
        System.out.println("2.   马自达6 400元/天   载人:4人" );
        System.out.println("3.   皮卡雪6 450元/天   载人:4人  载货：2吨" );
        System.out.println("4.   金龙        800元/天   载人:20人" );
        System.out.println("5.   松花江    400元/天    载人:4吨" );
        System.out.println("6.   依维柯    1000元/天   载人:20吨" );
        System.out.println("请输入您要租汽车的数量");
        int b=input.nextInt();
        int i=1;
        int price=0;
        int person=0;
        int cargo=0;
        String name1=" ";
        String name2=" ";
        for(;b>0;b--){
            System.out.println("请输入第"+i+"辆车的序号：");
            int choose=input.nextInt();
            switch(choose){
            case 1:{Total aodi=new Aodi();
            price=price+aodi.zuJin();
            person=person+aodi.zaiKe();
            cargo=cargo+aodi.zaiHuo();
            name1=name1+aodi.leiXing1();
            };break;
            case 2:{Total mazida=new Mazida();
            price=price+mazida.zuJin();
            person=person+mazida.zaiKe();
            cargo=cargo+mazida.zaiHuo();
            name1=name1+mazida.leiXing1();  
                    };break;
            case 3: {Total pikaxue=new Pokaxue();
            price=price+pikaxue.zuJin();
            person=person+pikaxue.zaiKe();
            cargo=cargo+pikaxue.zaiHuo();
            name1=name1+pikaxue.leiXing1();
            name2=name2+pikaxue.leiXing2();
            }   ;break;
            case 4:{Total jinlong=new Jianglong();
            price=price+jinlong.zuJin();
            person=person+jinlong.zaiKe();
            cargo=cargo+jinlong.zaiHuo();
            name1=name1+jinlong.leiXing1();
            }    ;break;
            case 5:{Total songhuajiang=new Songhuajiang();
            price=price+songhuajiang.zuJin();
            person=person+songhuajiang.zaiKe();
            cargo=cargo+songhuajiang.zaiHuo();
            name2=name2+songhuajiang.leiXing1();
            }    ;break;
            case 6:{Total yiweike=new Yiweihe();
            price=price+yiweike.zuJin();
            person=person+yiweike.zaiKe();
            cargo=cargo+yiweike.zaiHuo();
            name2=name2+yiweike.leiXing1();
            }    ;break;
            }
            i++;
        }
        System.out.println("输入租车天数：");
        int c=input.nextInt();

        System.out.println("您的账单：");
        System.out.println("***可载人的车有：");
        System.out.println(name1+"共载人："+person+"人");
        System.out.println("***载货的车有：");
        System.out.println(name2+"共载货："+cargo+"吨");
        System.out.println("租车总价格："+price*c);
    }else{
        System.out.println("欢迎您的下次使用，再见");
    }

    }

}

看了大神的之后，觉得好多地方都要改，这里先留一个纪念。如果有想评价一下的可以加qq1955873580