DVD管理系统

package 作业;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.Scanner;

import com.sun.org.apache.xerces.internal.impl.xpath.regex.ParseException;


public class DVD管理器 {
    
    static ArrayList<Object> arr = new ArrayList<>();
    static Scanner sc = new Scanner(System.in);

    public static void main(String[] args) throws java.text.ParseException {
        Dvd dvd0 = new Dvd(0,"罗马假日","已借出","2016-11-12");
        Dvd dvd1 = new Dvd(1,"风声鹤唳","可借","");
        Dvd dvd2 = new Dvd(2,"浪漫满屋","可借","");
        arr.add(dvd0);
        arr.add(dvd1);
        arr.add(dvd2);
        boolean backtrack = true;
        while(backtrack){
              String[] content = {"1.新增DVD","2.查看DVD","3.删除DVD","4.借出DVD","5.归还DVD","6.退出DVD"};
              System.out.println("
欢迎使用迷你DVD管理器");
              System.out.println("------------------------------------");
              for(String i:content)
                  System.out.println(i);
              System.out.println("------------------------------------");
              System.out.print("请选择: ");
              int number = sc.nextInt();
              switch (number){
                  case 1:System.out.println("---> 新增DVD");newly();break;
                  case 2:System.out.println("---> 查看DVD");examine();break;
                  case 3:System.out.println("---> 删除DVD");delete();break;
                  case 4:System.out.println("---> 借出DVD");loan();break;
                  case 5:System.out.println("---> 归还DVD");rerutn();break;
                  case 6:backtrack = quit();break;
                  default:break;
              }
           }
         System.out.println("谢谢使用！
");
     }
    
    //新增
    public static void newly(){
         System.out.print("请输入DVD名称: ");
         String name = sc.next();
         Dvd dvd = new Dvd(arr.size(),name,"可借","");
         arr.add(dvd);
         System.out.println("添加成功");
    }
    
    //查看
    public static void examine(){
        System.out.println("序号"+"	"+"名称"+"		"+"状态"+"	"+"日期");
        Iterator<Object> it = arr.iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }
    
    //删除
    public static void delete(){
          System.out.print("请输入DVD序号(number): ");
          int temp = sc.nextInt();
          if(temp < 0 || temp > arr.size()-1){
              System.out.print("没有该DVD序号，请重新输入 ");
          }else{
              arr.remove(temp);
          }
    }
    
    //借出
    public static void loan(){
        System.out.print("请输入借出DVD序号(number): ");
        int temp = sc.nextInt();
        if(temp < 0 || temp > arr.size()-1){
            System.out.print("没有该DVD序号，请重新输入 ");
        }else {
              Dvd dvd = (Dvd)arr.get(temp);
              if(dvd.status.equals("已借出")){
                  System.out.println("该书已经被借出，不可再借!");
              }else{
              //获取系统当前日期
                Date date = new Date();
                DateFormat df = DateFormat.getDateInstance();
                String day = df.format(date);
                dvd.status = "已借出";
                dvd.date = day;
                arr.set(temp, dvd);
                System.out.println("借出成功!");
              }
        }
    }
    
    //归还
    public static void rerutn() {
        System.out.print("请输入归还的DVD序号: ");
        int temp = sc.nextInt();
        if(temp < 0 || temp > arr.size()-1){
            System.out.print("没有该DVD序号，请重新输入 ");
        }else {
              Dvd dvd = (Dvd)arr.get(temp);
              if(dvd.status.equals("已借出")){
              //获取系统当前日期
                Date date = new Date();
                DateFormat df = DateFormat.getDateInstance();
                String day = df.format(date);
                dvd.status = "可借";
                arr.set(temp, dvd);
                System.out.println("借出日期为: "+dvd.date);
                System.out.println("归还日期为: "+day);               
                
                //计算租金
                DateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
                long money = 0;     
              
                try{
                     Date d3 = sd.parse(day);
                     Date d2 = sd.parse(dvd.date);
                     money = (d3.getTime()-d2.getTime())/(24*60*60*1000);
                }catch (Exception e) {
                    e.printStackTrace();
                }                              
               
                
                System.out.println("应付租金(元): "+money);
                System.out.println("归还成功!");
              }else{
            System.out.println("该书未被借出，不需归还!");
              }
            } 
    }
    
    //退出
    public static boolean quit(){
        return false;
    }
}


class Dvd{
    int id;
    String name;
    String status;
    String date;
    public Dvd(int id,String name,String status,String date){
        this.id = id;
        this.name = name;
        this.status = status;
        this.date = date;
    }
    @Override
    public String toString() {
        return this.id+"	"+this.name+"	"+"	"+this.status+"	"+this.date;
    }
}