Java如何实现简单图书借阅系统

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为图书阅览室开发一个图书借阅系统，最多可存50本图书，实现图书的管理。图书借阅系统具备以下主要功能。

u功能

借出排行榜

新增图书

查看图书

删除图书

借出图书

归还图书

退出

package com.daiinfo.seninorjava.ken8.implentment.utils;import java.text.SimpleDateFORMat;import java.util.Calendar;import java.util.Scanner;public class Bookborrowing {    public static void main(String[] args){        int[] states=new int[50];//图书借阅状态 状态0：已借出，1：可借        int[] counts=new int[50];//图书借阅次数        String[] name=new String[50];//图书名称        String[] dates=new String[50];//图书日期        //初始化图书        states[0]=0;        counts[0]=15;        name[0]="数据结构";        dates[0]="2018-7-15";                states[1]=1;        counts[1]=12;        name[1]="数据库";        dates[1]=null;                states[2]=2;        counts[2]=30;        name[2]="离散数学";        dates[2]=null;        //外观界面        Scanner input=new Scanner(System.in);        int num=-1;//用户输入0返回主菜单        boolean flage=false;//记录用户是否退出系统，true为退出，false为不退出        do {            System.out.println("*************************************");            System.out.println("1、新增图书");            System.out.println("2、查看图书");            System.out.println("3、删除图书");            System.out.println("4、借出图书");            System.out.println("5、归还图书");            System.out.println("6、退出");            int choose=input.nextInt();            switch(choose){            case 0:                int number=0;                for(;name[number]!=null;number++) {                                    }//求出当前书目总数                int[] sortBook=new int[number];                printBook(name,counts,number,sortBook);                break;            case 1:                System.out.println("------>新增图书");                int a=0;                for(;a<name.length;a++) {                    if(name[a]==null) {                        System.out.println("请输入图书名称");                        name[a]=input.next();//录入书名                        System.out.println("/n"+"新增《"+name[a]+"》成功！！！");                                                //将图书信息存入数组                        states[a]=1;                        counts[a]=0;                        dates[a]=null;                        break;                    }                }                if(a==50) {                    System.out.println("书架已满，勿加");                }                System.out.println("******************************");                break;            case 2:                System.out.println("------>查看图书");                System.out.println("序号\t状态\t名称\t借出日期\t");                for(int i=0;name[i]!=null;i++) {                    String situation=(states[i]==0)?"已借出":"可借";                    System.out.println((i+1)+"\t"+situation+"\t《"+name[i]+"》\t");                    if(states[i]==0) {                        System.out.println(dates[i]);                    }else {                        System.out.println();                    }                }                System.out.println("*******************************");                break;            case 3:                System.out.println("------->删除图书");                System.out.println("请输入图书名称");                String book=input.next();                boolean check1=false;//判断是否找到删除图书名称，false找不到                for(int b=0;name[b]!=null;b++) {                    if(name[b].equals(book)) {                        check1=true;                        if(states[b]==1) {                            //图书未借出，可以删除                            System.out.println("删除《"+book+"》成功！");                            int i=b;                            for(;i<name.length-1;i++) {                                states[i]=states[i+1];                                name[i]=name[i+1];                                dates[i]=dates[i+1];                                counts[i]=counts[i+1];                            }//将数组内容前移                            break;                        }else {                            System.out.println("图书已借出，无法删除！");                            break;                        }                    }                }                if(check1==false) {                    System.out.println("没有找到匹配信息！");                }                System.out.println("*************************");                break;            case 4:                System.out.println("--------->借出图书");                System.out.println("请输入图书名称：");                String back=input.next();                boolean check2=false;//判断想要借出的书能否找到，false找不到，true找到                for(int b=0;name[b]!=null;b++) {                   if(name[b].equals(back)) {//书存在                       check2=true;                       if(states[b]==1) {                           System.out.println("请输入借出日期（年-月-日）：");                           dates[b]=input.next();                           while(judge(dates[b])==false) {                               System.out.println("日期非法，请重新输入");                               dates[b]=input.next();                           }                           states[b]=0;//将当前图书状态调成借出                           counts[b]++;//当前图书借出次数加一                       }else {                           System.out.println(name[b]+"已被借出！");                       }                       break;                   }                }                if(check2==false) {                    System.out.println("没有找到匹配信息！");                }                System.out.println("*********************************");                break;            case 5:                System.out.println("--------->归还图书");                System.out.println("请输入图书名称：");                String back1=input.next();                boolean check3=false;//判断归还的书能否找到，false找不到，true找到                for(int b=0;name[b]!=null;b++) {                       if(name[b].equals(back1)) {//书存在                           check3=true;                           if(states[b]==0) {//如果书借出                               System.out.println("请输入归还日期（年-月-日）：");                               String returnDate=input.next();                               while(judge(returnDate)==false) {                                   System.out.println("日期非法，请重新输入");                                   returnDate=input.next();                               }                               System.out.println("归还《"+back1+"》成功！");                               System.out.println("借出日期"+dates[b]);                               System.out.println("归还日期"+returnDate);                               int money=0;                               try {                                   money=daysBetween(dates[b],returnDate);                                   }catch(Exception e) {                                       e.printStackTrace();                                   }                               System.out.println("该书没有被借出，无法执行操作");                               }                           break;                           }                       }                if(check3==false) {                    System.out.println("没有找到匹配信息！");                }                System.out.println("*********************************");                break;            case 6:                flage=true;                break;                default:                flage=true;                break;            }            if(flage==true) {                break;            }else {                System.out.println("输入0返回");                num=input.nextInt();            }        }while(num==0);        System.out.println("谢谢使用！");    }    private static boolean judge(String str) {        // TODO Auto-generated method stub        SimpleDateFormat sd=new SimpleDateFormat("yy-MM-dd");//日期格式        try {            sd.setLenient(false);//指定日期时间是否合格，true不合格，false合格            sd.parse(str);        }catch(Exception e){            return false;        }        return true;    }    public static void printBook(String[] names,int[] sortBook,int number,int[] counts) {        int[] another=counts.clone();//复制数组        int i=0;        int max=another[0];        for(int p=0;p<=max;p++) {            for(int q=0;q<number;q++) {                if(counts[q]==p) {                    sortBook[i++]=q;                }            }        }        System.out.println("序号\t"+"书名\t"+"借出次数");        for(int x=(number-1);x>=0;x--) {//借出次数排行榜            System.out.println((number-x)+"\t"+names[sortBook[x]]+"\t\t"+counts[sortBook[x]]);        }        System.out.println("******************");    }    public static int daysBetween(String smdate,String bdate) throws Exception{        SimpleDateFormat sdf=new SimpleDateFormat("yy-MM-dd");        Calendar cal=Calendar.getInstance();        cal.setTime(sdf.parse(smdate));        long time1=cal.getTimeInMillis();        cal.setTime(sdf.parse(bdate));        long time2=cal.getTimeInMillis();        long between_days=(time2-time1)/(1000*3600*24);        return Integer.parseInt(String.valueOf(between_days));    }}

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