达达租车系统（初版）

package com.demo;
import java.util.Scanner;
/*

• 运行基本跟视频中的显示效果一样，评论处有全部代码截图 看的清晰一点 这个自动排版有些乱 写的有些乱 有时间再改下
  */

public class Demo {

public static void main(String[] args) {
    // TODO 自动生成的方法存根
    Car [] conut = {new Bus("奥迪A4", 500, 4),new Bus("马自达", 400, 4),new Bus("金龙", 800, 20), 
            new Pick("皮卡雪", 450, 4, 2),new Truck("松花江", 400, 4),new Truck("依维柯", 1000, 20)}; 
    int sum=0;  //载人数

    String name1="";
    String name2="";
    int mnoey=0;
    int day=0;
    int again=0;

    System.out.println("欢迎使用达达租车系统");
    System.out.println("租车请按 1，退出请按 2");
    int go = new Scanner(System.in).nextInt();

    if (go == 1) {
        System.out.println("下面是可租车的详细信息：");
        System.out.println("序号\t" + "车名\t"+ "元/天\t"+ "载人数\t"+ "载货数\t"  );
        for (int i = 0; i < conut.length; i++) {
            if(conut[i] instanceof Bus){
                System.out.println(i+1 + ".\t" + conut[i].getName() + "\t" + conut[i].getMoney() + "\t" + conut[i].getSum());
            }else if (conut[i] instanceof Truck){
                System.out.println(i+1 + ".\t" + conut[i].getName() + "\t" + conut[i].getMoney() + "\t\t" + conut[i].getAgain());
            }else {
                System.out.println(i+1 + ".\t" + conut[i].getName() + "\t" + conut[i].getMoney() + "\t" + conut[i].getSum() + "\t" + conut[i].getAgain());
            }
        }
        System.out.println("请输入你要租车的数量：");
        int go1 = new Scanner(System.in).nextInt();
//      int x = 1;  //更新删掉变量x，将i初始值改为1即可

        for (int i = 1; i < go1; i++) {
            System.out.println("请输入你要租的第" + i +"辆车的序号：");
            int go2 = new Scanner(System.in).nextInt();
//          x++; //删除
            if(go2>6  go2<=0){
                System.out.println("您输入有误！请重新选择！");
                System.out.println();
//              --x;/删除
                --i;
            }else if (conut[go2-1] instanceof Bus){                 
                name1 = conut[go2-1].getName()+"\t"+name1;
                sum += conut[go2-1].getSum();
                mnoey += conut[go2-1].getMoney();
            }else if (conut[go2-1] instanceof Truck) {
                name2 = conut[go2-1].getName()+"\t"+name2;
                again += conut[go2-1].getAgain();
                mnoey += conut[go2-1].getMoney();
            }else if(conut[go2-1] instanceof Pick){
                name1 = conut[go2-1].getName()+"\t"+name1;
                name2 = conut[go2-1].getName()+"\t"+name2;

                again += conut[go2-1].getAgain();
                mnoey += conut[go2-1].getMoney();
                sum = conut[go2-1].getSum() + sum;
            }
        }

        System.out.println("请输入租车天数：");
        day = new Scanner(System.in).nextInt();
        if (day < 0) {
            System.out.println("请重新输入大于0的数：");
            day = new Scanner(System.in).nextInt();
        }else {
            mnoey = day*mnoey;
        }

        System.out.println("您的账单：");
        if("".equals(name1)!= true){
            System.out.println("***可载人的车有：");
            System.out.print(name1);    
            System.out.println("载人数：" + sum);
        }
        if("".equals(name2)!= true){
            System.out.println("***可载货的车有：");
            System.out.print(name2);    
            System.out.println("载货数：" + again);
        }
        System.out.println("共计金额：" + mnoey);
        main(args); //测试用 不退出程序
        System.out.println();
        System.out.println();

    }else if (go == 2) {
        System.out.println("已退出，期待您的下次使用！");
        System.exit(0);
    }else {
        System.out.println("您输入有误！请重新选择！");
        System.out.println();
        System.out.println();
        main(args);     //重新执行主函数
    }

}

}

//父类
package com.demo;

public class Car {
private String name;//名称
private int money; //价格
private int sum; //载人数
private int again; //载货量

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public int getMoney() {
    return money;
}
public void setMoney(int money) {
    this.money = money;
}
public int getSum() {
    return sum;
}
public void setSum(int sum) {
    this.sum = sum;
}
public int getAgain() {
    return again;
}
public void setAgain(int again) {
    this.again = again;
}

}

//子类
package com.demo;

public class Bus extends Car {
public Bus(String newName,int newMoney,int newSum) {
this.setName(newName);
this.setMoney(newMoney);
this.setSum(newSum);
}
}

//子类
package com.demo;

public class Truck extends Car {
public Truck(String newName,int newMoney,int newAgain) {
this.setName(newName);
this.setMoney(newMoney);
this.setAgain(newAgain);
}

}

package com.demo;

public class Pick extends Car{
public Pick(String newName,int newMoney,int newSum,int newAgain){
this.setName(newName);
this.setMoney(newMoney);
this.setSum(newSum);
this.setAgain(newAgain);
}

}