父类

package com.mybbzy2;

public abstract class Car {
    int money ;
    int goods;
    int people;
    String name;
    public abstract void run();
    public abstract String getinfo();
    public String getCar(){
        String list = "\t"+name+"\t"+money+"/天";
        return list;
    }

}

子类（载人客车）

package com.mybbzy2;

public class Peoplecar extends Car {
    public Peoplecar(String name,int money,int people){
        this.name = name;
        this.money = money;
        this.people = people;
    }
    @Override
    public void run() {
        // TODO 自动生成的方法存根

    }

    @Override
    public String getinfo() {
        // TODO 自动生成的方法存根
        String list = "\t"+this.name+"\t"+this.money+"/天"+"\t"+this.people+"人";
        return list;
    }

}

子类（货车）

package com.mybbzy2;

public class Truck extends Car {
    public Truck(String name,int money,int goods){
        this.name = name;
        this.money = money;
        this.goods = goods;
    }

    @Override
    public void run() {
        // TODO 自动生成的方法存根

    }

    @Override
    public String getinfo() {
        // TODO 自动生成的方法存根
        String list = "\t"+this.name+"\t"+this.money+"/天"+"\t"+this.goods+"顿";
        return list;
    }

}

子类皮卡

package com.mybbzy2;

public class Pick extends Car {
    public Pick(String name, int money,int people,int goods){
        this.goods = goods;
        this.money = money;
        this.name = name;
        this.people = people;
    }
    @Override
    public void run() {
        // TODO 自动生成的方法存根

    }

    @Override
    public String getinfo() {
        // TODO 自动生成的方法存根
        String list = "\t"+this.name+"\t"+this.money+"/天"+"\t"+this.people+"人"+"\t"+this.goods+"顿";
        return list;
    }

}

主函数

package com.mybbzy2;

import java.util.Scanner;

public class Test {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        System.out.println("****欢迎使用达达租车系统！*****");
        System.out.println("你是否要租车？   是：请安“1” 否：请按“2”");
        Scanner sc = new Scanner(System.in);//获取用户的输入
        int a = sc.nextInt();
        if(a == 2){
            System.out.println("欢迎您下次使用达达租车系统！");
        }else if (a==1){
            Car []cars = new Car[]{
                    new Peoplecar("奥迪A4",500,4),
                    new Peoplecar("奥迪A6",600,6),
                    new Truck("拖拉机",100,7),
                    new Truck("大卡车",300,10),
                    new Pick("小皮卡",200,4,5),
                    new Pick("大皮卡",300,6,8)

            };
            System.out.println("请选择车类别：1-小客车、2-货车、3-皮卡、4-全部" );
            int b = sc.nextInt();
            if(b==4){
                System.out.println("----------今日可租车清单----------");
                System.out.println("序号      汽车名称     租金/天   容量");
            for(int i = 0;i<cars.length;i++){
                System.out.println((i+1)+"\t"+cars[i].getinfo());
            }
            }else if(b==3){
                for(int i = 0;i<cars.length;i++){
                    if(cars[i] instanceof Pick){
                        System.out.println((i+1)+"\t"+cars[i].getinfo());
                    }
                }
            }else if(b==2){
                for(int i = 0;i<cars.length;i++){
                    if(cars[i] instanceof Truck){
                        System.out.println((i+1)+"\t"+cars[i].getinfo());
                    }
                }
            }else if(b==1){
                for(int i = 0;i<cars.length;i++){
                    if(cars[i] instanceof Peoplecar){
                        System.out.println((i+1)+"\t"+cars[i].getinfo());
                    }
                }
            }else{
                System.out.println("您输入的数字有误！请重新输入：");
            }
            System.out.println("请选择车辆（输入序号，空格隔开 ）：");
            Scanner scanner = new Scanner(System.in);
            String input3 = scanner.nextLine(); 
            input3 = input3.trim();
            String[] temp = input3.split(" "); 
            int[] nums = new int[temp.length];
            System.out.println("----------租车清单----------");
            System.out.println("序号 名称 租金/天 ");
            int result=0; for (int i = 0; i < temp.length; i++) {
                nums[i] = Integer.parseInt(temp[i]); 
                System.out.println(i+cars[nums[i]].getinfo());
                result=cars[nums[i]].money+result; } 
            System.out.printf("%50s", "总价格："+result+"\n");
            System.out.println("确定-1 取消-2");
            int c=scanner.nextInt(); 
            if(c==1){
                System.out.println("租车成功！欢迎下次使用！"); 
                } else{ 
                System.out.println("请重新选择"); 
                } 
            scanner.close();
        }else{
            System.out.println("您输入的数字有误！请重新输入：");
        }
        sc.close();
    }

}

新手练习。还请大神多多提建议！多多关照