package tushuguananli;

import java.text.SimpleDateFormat;

import java.util.Date;

public class TuShu {

    // 狀態(tài)  名稱  借出時間

    public  String state;

    public  String name;

    public  Date date;

public  void setTuShu(String zhuangtai , String mingzi, Date riqi){

    state=zhuangtai;

    name=mingzi;

    date=riqi;

}

    public void print( int index){

        System.out.println(index+"\t"+name+"\t"+state+"\t"+date);

    }

}

package tushuguananli;

public class TuShuSet {

    TuShu[] tushus=new TuShu[30];

}

package tushuguananli;

import sun.util.calendar.BaseCalendar;

import java.text.DateFormat;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Scanner;

public class TuShuManage {

    TuShuSet tushuset=new TuShuSet();

    //倉庫初始化  放入商品

    public void initila(){

        TuShu  tushu1=new TuShu();

        tushu1.setTuShu( "已借出" ,"<<java基礎(chǔ)教程>>", new Date());

          TuShu tushu2=new TuShu();

          tushu2.setTuShu("可借", "<<數(shù)據(jù)庫技術(shù)>>", null);

          TuShu tushu3=new TuShu();

          tushu3.setTuShu("可借",  "<<人與神話>>" ,null);

          tushuset.tushus[0]=tushu1;

          tushuset.tushus[1]=tushu2;

          tushuset.tushus[2]=tushu3;

    }

    //菜單

    public  void  startMenu() throws ParseException {

        System.out.println("歡迎使用圖書管理系統(tǒng)");

        System.out.println("————————————————————————————");

        boolean flag=true;

        do{

        System.out.println("1.新增圖書");

        System.out.println("2.查看圖書");

        System.out.println("3.刪除圖書");

        System.out.println("4.借出圖書");

        System.out.println("5.歸還圖書");

        System.out.println("6.退出");

        System.out.println("請選擇：");

        Scanner scanner=new Scanner(System.in);

        int num=scanner.nextInt();

        switch (num){

            case 1:

                System.out.println("--->新增圖書");

                xinzeng();

                break;

            case 2:

                System.out.println("--->查看圖書");

                chakan();

                break;

            case 3:

                System.out.println("--->刪除圖書");

                shanchu();

                break;

            case 4:

                System.out.println("---借出圖書");

                jiechu();

                break;

            case 5:

                System.out.println("--->歸還圖書");

                guihuan();

                break;

            case 6:

                System.out.println("--->退出");

                flag=false;

                break;

            default:

                System.out.println("請再次輸入");

        }

        }while(flag);

    }

    public void xinzeng(){

            System.out.println("請輸入圖書名稱");

            Scanner scanner=new  Scanner(System.in);

            String mingzi1=scanner.next();

            System.out.println("新增"+mingzi1+"成功");

            TuShu tuShu4=new TuShu();

            tuShu4.setTuShu("可借",mingzi1,null);

        for (int i = 0; i < tushuset.tushus.length; i++) {

            if (tushuset.tushus[i] == null) {

                tushuset.tushus[i] = tuShu4; // 把新建的對象放在數(shù)組中的第一個空位置

                break; // 后續(xù)的空位置直接跳過

            }

        }

    }

    public  void chakan(){

          System.out.println("序號"+"\t"+"狀態(tài)"+"\t"+"名稱"+"\t"+"借出日期");

          for(int i=0;i<tushuset.tushus.length;i++){

              if(tushuset.tushus[i]!=null){

                  tushuset.tushus[i].print(i+1);

              }

          }

    }

    public  void shanchu(){

        System.out.println("請輸入圖書名稱");

        Scanner scanner=new Scanner(System.in);

        String tushu5=scanner.next();

        for(int i=0; i<tushuset.tushus.length;i++){

            if(tushuset.tushus[i]!=null&&tushuset.tushus[i].name==tushu5&&

            tushuset.tushus[i].state=="可借"){

                    int j=i;

              while ( tushuset.tushus[j+1]!=null){

                      tushuset.tushus[j]=tushuset.tushus[j+1];

                      j++;

                  }

                tushuset.tushus[j]=null;

                System.out.println("刪除"+tushu5+"成功");

                break;

                }

            else {

                System.out.println(tushu5 + "為借出狀態(tài)雌芽，不能刪除");

            }

            }

        }

    public void  jiechu() throws ParseException {

        Scanner scanner=new Scanner(System.in);

        System.out.println("請輸入借出書名稱：");

        String tushu6=scanner.next();

        System.out.println("請輸借出日期(年-月-日)：");

        String time = scanner.next();

        DateFormat format=new SimpleDateFormat("yyyy年MM月dd日");

        Date  date1=format.parse(time);

        for(int i=0; i<tushuset.tushus.length;i++){

            if (tushuset.tushus[i] != null && tushuset.tushus[i].name==tushu6&&

                    tushuset.tushus[i].state=="可借"){

                tushuset.tushus[i].state="已借出";

                tushuset.tushus[i].date=date1;

                System.out.println("借出"+tushu6+"成功");

            }

        }

    }

    public void guihuan() throws ParseException {

        int num=0;

          Scanner scanner=new Scanner(System.in);

          System.out.println("請輸入圖書名稱");

          String tushu7= scanner.next();

          System.out.println("請輸入歸還日期(年-月-日)");

          String time2=scanner.next();

        DateFormat format=new SimpleDateFormat("yyyy年MM月dd日");

        Date  date2=format.parse(time2);

        for (int i=0;i<tushuset.tushus.length;i++){

            if(tushuset.tushus[i].name==tushu7&&tushuset.tushus[i]!=null&&

                    tushuset.tushus[i].state=="已借出"){

                System.out.println("借出時間"+tushuset.tushus[i].date);

                System.out.println("歸還時間"+date2);

                long alnteger=((tushuset.tushus[i].date.getTime()-date2.getTime())/(24*60*60*1000));

                num=(int)alnteger;

                System.out.println("需要支付"+num+"元");

                System.out.println("歸還"+tushu7+"成功");

                tushuset.tushus[i].state="可借";

                tushuset.tushus[i].date=null;

            }

        }

    }

}

package tushuguananli;

import java.text.ParseException;

import java.util.Scanner;

public class Demo {

    public static void main(String[] args) throws ParseException {

        TuShuManage thshumanage=new TuShuManage();

        thshumanage.initila();

        thshumanage.startMenu();

    }

}