Java图书馆[通俗易懂]

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io流用的不是很熟练，还有Book类的应用出了点问题，越改越错，从2个错误改到102个QAQ，孩子想哭，问了好多人也没改成，最后勉强成型，而且上个星期内分泌系统出了点小问题，天天往医院跑，开始敲的太晚了，现在要备战期末考，等期末考结束再改改Book类吧。

主函数和界面

io流

操作

1.   添加
2. 修改
3. 查找
4. 排序
5. 删除

基本类

1. Book
2. Borrow
3. Reader

主函数和界面

package view;
import functions.Libraryborrow;
import functions.LibraryinformationManagement;
import functions.LibraryreaderManagement;

import java.io.IOException;
import java.text.ParseException;

public class Main {
    public static void main(String[] args) throws IOException, ClassNotFoundException, ParseException {
        boolean b = true;
        while (b) {
            System.out.println("*********************");
            System.out.println("1、进入图书管理系统");
            System.out.println("2、进入读者管理系统");
            System.out.println("3、借阅、归还书籍");
            System.out.println("4、退出系统");
            System.out.println("*********************");
            char c = Tool.tools.readMenuSelection();
            switch (c) {
                case '1':
                    LibraryinformationManagement.bookmew();
                    break;
                case '2':
                    LibraryreaderManagement.readermew();
                    break;
                case '3':
                    Libraryborrow.sentaku();
                    break;
                case '4':
                    System.out.println("谢谢使用");
                    System.exit(0);
                    break;
            }
        }

    }
}

IT知识分享网

IT知识分享网
package functions;
import EntityClass.Book;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

import static functions.Add.AddBook;
import static functions.Find.findbook;

public class LibraryinformationManagement {
    public static void bookmew() throws IOException, ClassNotFoundException {
        ArrayList<Book> array=new ArrayList<Book>();
        while (true) {
            System.out.println("1.添加图书");
            System.out.println("2.查询图书");
            System.out.println("3.图书排序");
            System.out.println("4.修改或删除图书");
            System.out.println("5.返回上一级");
            char c = Tool.tools.readMenuSelection();
            switch (c) {
                case '1':
                    AddBook(array);
                    break;
                case '2':
                    findbook(array);
                    break;
                case '3':
                    sort.sentakusort();
                    break;
                case '4':
                    sentaku1();
                    Change.change1();
                    break;
                case '5':
                    return;
            }
        }
    }
    public static void sentaku1() throws IOException{
        System.out.println("您要进行修改还是删除？："+"\n"+"1、修改\n2、删除");
        int s;
        Scanner sc = new Scanner(System.in);
        while (true)
        {
            s = sc.nextInt();
            if(s!=1&&s!=2)
                System.out.println("输入有误，请重新输入");
            else break;
        }

        switch (s){
            case 1:
                Change.sentakuchange1();
                break;
            case 2:
                Delete.sentakudelete1();
                break;
        }
    }

}

package functions;

import EntityClass.Reader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class LibraryreaderManagement {
    public static void readermew() throws IOException, ClassNotFoundException {
        ArrayList<Reader> array=new ArrayList<Reader>();
        while (true) {
            System.out.println("1.添加读者信息");
            System.out.println("2.查询读者信息");
            System.out.println("3.读者信息排序");
            System.out.println("4.修改或删除读者信息");
            System.out.println("5.返回上一级");
            Scanner sc = new Scanner(System.in);
            String line = sc.nextLine();
            switch (line) {
                case "1":
                    Add.AddReader(array);
                    break;
                case "2":
                    Find.findreader(array);
                    break;
                case "3":
                    sort.sentakusortreader();
                    break;
                case "4":
                    sentaku1();
                    break;
                case "5":
                    return;
            }
        }
    }
    public static void sentaku1() throws IOException{
        System.out.println("您要进行修改还是删除？："+"\n"+"1、修改\n2、删除");
        int s;
        Scanner sc = new Scanner(System.in);
        while (true)
        {
            s = sc.nextInt();
            if(s!=1&&s!=2)
                System.out.println("输入有误，请重新输入");
            else break;
        }

        switch (s){
            case 1:
                Change.change3();
                break;
            case 2:
                Delete.detelebook3();
                break;
        }
    }
}

io流

IT知识分享网package functions;

import EntityClass.Book;
import EntityClass.Borrow;
import EntityClass.Reader;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

import static java.lang.Integer.parseInt;

public class io {
    public static ArrayList inbook() throws IOException {
        FileReader fr = new FileReader("myFile\\book.txt");
        BufferedReader br = new BufferedReader(fr);
        ArrayList<Book> array = new ArrayList<Book>();
        String line;
        while ((line = br.readLine()) != null) {
            String[] strArray = line.split(",");
            Book book = new Book();
            book.setNum(parseInt(strArray[0]));
            book.setName(strArray[1]);
            book.setAuthor(strArray[2]);
            book.setPrice(strArray[3]);
            book.setQuantity(parseInt(strArray[4]));
            book.setDate(strArray[5]);
            book.setPress(strArray[6]);
            array.add(book);
        }
        br.close();
        fr.close();
        return array;
    }

    public static ArrayList inreader() throws IOException {
        FileReader fr = new FileReader("myFile\\reader.txt");
        BufferedReader br = new BufferedReader(fr);
        ArrayList<Reader> array = new ArrayList<Reader>();
        String line;
        while ((line = br.readLine()) != null) {
            String[] strArray = line.split(",");
            Reader reader = new Reader();
            reader.setNum(Integer.parseInt(strArray[0]));
            reader.setName(strArray[1]);
            reader.setCollege(strArray[2]);
            reader.setClass(strArray[3]);
            array.add(reader);
        }
        br.close();
        fr.close();
        return array;
    }

    public static ArrayList inborrow() throws IOException {
        FileReader fr = new FileReader("myFile\\borrow.txt");
        BufferedReader br = new BufferedReader(fr);
        ArrayList<Borrow> array = new ArrayList<Borrow>();
        String line;
        while ((line = br.readLine()) != null) {
            String[] strArray = line.split(",");
            Borrow borrow = new Borrow();
            borrow.setNum1(parseInt(strArray[0]));
            borrow.setName(strArray[1]);
            borrow.setNum2(parseInt(strArray[2]));
            borrow.setBookname(strArray[3]);
            borrow.setBorrowdate(strArray[4]);
            borrow.setShouldreturndate(strArray[5]);
            borrow.setReturndate(strArray[6]);
            array.add(borrow);
        }
        br.close();
        fr.close();
        return array;
    }
}

操作

1.添加

package functions;

import EntityClass.Book;
import EntityClass.Reader;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Add {

    //图书信息添加
    public static void AddBook(ArrayList<Book>arrayList) throws IOException,ClassNotFoundException{
        ArrayList<Book> array1=new ArrayList<Book>();
        File file =new File("myFile");
        file.mkdirs();
        FileWriter fw=new FileWriter("myFile\\book.txt",true);
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入书名：");
        String name=sc.nextLine();
        fw.write(name);
        System.out.println("请输入书号：");
        String n = sc.nextLine();
        int num=Integer.parseInt(n);
        fw.write(num);
        System.out.println("请输入作者：");
        String author=sc.nextLine();
        fw.write(author);
        System.out.println("请输入出版社：");
        String press=sc.nextLine();
        fw.write(press);
        System.out.println("请输入出版时间：");
        String date=sc.nextLine();
        fw.write(date);
        System.out.println("请输入数量：");
        int quantity=sc.nextInt();
        fw.write(date);
        System.out.println("请输入价格：");
        sc.nextLine();
        String price=sc.nextLine();
        fw.write(price);
        Book s=new Book();
        s.setName(name);
        s.setAuthor(author);
        s.setDate(date);
        s.setNum(num);
        s.setPress(press);
        s.setPrice(price);
        s.setQuantity(quantity);
        array1.add(s);
        for(int i=0;i<array1.size();i++) {
            Book a=new Book();
            a=array1.get(i);
            fw.write(a.getNum()+","+a.getName()+","+a.getAuthor()+","+a.getPrice()+","+a.getQuantity()+","+a.getDate()+","+a.getPress()+"\r\n");
        }
        System.out.println("添加图书成功！");
        fw.close();
    }
    //读者信息添加
    public static void AddReader(ArrayList<Reader>arrayList) throws IOException,ClassNotFoundException{
        ArrayList<Reader> array1=new ArrayList<Reader>();
        File file =new File("myFile");
        file.mkdirs();
        FileWriter fw=new FileWriter("myFile\\reader.txt",true);
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入姓名：");
        String name=sc.nextLine();
        System.out.println("请输入学号：");
        String n = sc.nextLine();
        int num=Integer.parseInt(n);
        System.out.println("请输入学院：");
        String college=sc.nextLine();
        System.out.println("请输入专业班级：");
        String Classs=sc.nextLine();
        Reader s=new Reader();
        s.setName(name);
        s.setNum(num);
        s.setCollege(college);
        s.setClass(Classs);
        array1.add(s);
        for(int i=0;i<array1.size();i++) {
            Reader a=new Reader();
            a=array1.get(i);
            fw.write(a.getNum()+","+a.getName()+","+a.getCollege()+","+a.getClasss()+"\r\n");
        }
        System.out.println("添加读者信息成功！");
        fw.close();
    }


}

2.修改

package functions;

import EntityClass.Book;
import EntityClass.Reader;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Change {
    public static void sentakuchange1() throws IOException{
        System.out.println("您要选择哪种方法进行修改："+"\n"+"1、使用书名\n2、使用书号");
        int s;
        Scanner sc = new Scanner(System.in);
        while (true)
        {
            s = sc.nextInt();
            if(s!=1&&s!=2)
                System.out.println("输入有误，请重新输入");
            else break;
        }

        switch (s){
            case 1:
                change1();
                break;
            case 2:
                change2();
                break;
        }
    }
    public static void change1() throws IOException{
        //按照书籍名修改书籍
        System.out.println("请输入要修改的书名：");
        ArrayList<Book> array1=io.inbook();
        ArrayList<Book> array2 = null;
        boolean bool=false;
        int n=0;
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        for(int i=0;i<array1.size();i++)
        {
            Book a=new Book();
            a=array1.get(i);
            if(a.getName().equals(line)){
                System.out.println("您要找的书籍是：\n"+a.getNum() + "," + a.getName() + "," + a.getAuthor() + "," + a.getPrice() + "," + a.getQuantity() + "," + a.getDate() + "," + a.getPress());
                n=i;
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的书籍不存在！");
            return;
        }
        System.out.println("请输入修改后的书名：");
        String name=sc.nextLine();
        System.out.println("请输入修改后的书号(仅能输入数字)：");
        String h = sc.nextLine();
        int num=Integer.parseInt(h);
        System.out.println("请输入修改后的作者：");
        String author=sc.nextLine();
        System.out.println("请输入修改后的出版社：");
        String press=sc.nextLine();
        System.out.println("请输入修改后的出版时间：");
        String date=sc.nextLine();
        System.out.println("请输入修改后的数量：");
        int quantity=sc.nextInt();
        System.out.println("请输入修改后的价格：");
        String price=sc.nextLine();
        Book s=new Book();
        s.setName(name);
        s.setAuthor(author);
        s.setDate(date);
        s.setNum(num);
        s.setPress(press);
        s.setPrice(price);
        s.setQuantity(quantity);
        array1.set(n,s);
        FileWriter fr=new FileWriter("myFile\\book.txt");
        BufferedWriter br=new BufferedWriter(fr);
        for(int i=0;i<array1.size();i++) {
            Book a=new Book();
            a=array1.get(i);
            br.write(a.getNum()+","+a.getName()+","+a.getAuthor()+","+a.getPrice()+","+a.getQuantity()+","+a.getDate()+","+a.getPress()+"\r\n");
        }
        System.out.println("修改图书信息成功！");
        System.out.println("修改后的书籍信息：\n"+s.getNum() + "," + s.getName() + "," + s.getAuthor() + "," + s.getPrice() + "," + s.getQuantity() + "," + s.getDate() + "," + s.getPress());
        br.close();
        fr.close();
    }
    public static void change2() throws IOException{
        //按照书号修改书籍
        System.out.println("请输入要修改的书号(仅能输入数字)：");
        ArrayList<Book> array1=io.inbook();
        ArrayList<Book> array2 = null;
        boolean bool=false;
        int n=0;
        Scanner sc=new Scanner(System.in);
        int line=sc.nextInt();
        for(int i=0;i<array1.size();i++)
        {
            Book a=new Book();
            a=array1.get(i);
            if(a.getNum()==line){
                System.out.println("您要找的书籍是：\n"+a.getNum() + "," + a.getName() + "," + a.getAuthor() + "," + a.getPrice() + "," + a.getQuantity() + "," + a.getDate() + "," + a.getPress());
                array2.add(a);
                n=i;
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的书籍不存在！");
            return;
        }
        System.out.println("请输入修改后的书名：");
        String name=sc.nextLine();
        System.out.println("请输入修改后的书号(仅能输入数字)：");
        int num=sc.nextInt();
        System.out.println("请输入修改后的作者：");
        String author=sc.nextLine();
        System.out.println("请输入修改后的出版社：");
        String press=sc.nextLine();
        System.out.println("请输入修改后的出版时间：");
        int quantity=sc.nextInt();
        System.out.println("请输入修改后的数量：");
        String date=sc.nextLine();
        System.out.println("请输入修改后的价格：");
        String price=sc.nextLine();
        Book s=new Book();
        s.setName(name);
        s.setAuthor(author);
        s.setDate(date);
        s.setNum(num);
        s.setPress(press);
        s.setPrice(price);
        s.setQuantity(quantity);
        array1.set(n,s);
        FileWriter fr=new FileWriter("myFile\\book.txt");
        BufferedWriter br=new BufferedWriter(fr);
        for(int i=0;i<array1.size();i++) {
            Book a=new Book();
            a=array1.get(i);
            br.write(a.getNum()+","+a.getName()+","+a.getAuthor()+","+a.getPrice()+","+a.getQuantity()+","+a.getDate()+","+a.getPress()+"\r\n");
        }
        System.out.println("修改图书信息成功！");
        System.out.println("修改后的书籍信息：\n"+s.getNum() + "," + s.getName() + "," + s.getAuthor() + "," + s.getPrice() + "," + s.getQuantity() + "," + s.getDate() + "," + s.getPress());
        br.close();
        fr.close();
    }

    public static void change3() throws IOException{
        //按照学号+姓名修改信息
        ArrayList<Reader> array1=io.inreader();
        ArrayList<Reader> array2 = null;
        boolean bool=false;
        int n=0;
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入要修改的学号(仅能输入数字):");
        int nu=sc.nextInt();
        System.out.println("请输入要修改的姓名:");
        String l=sc.nextLine();
        String line=sc.nextLine();
        for(int i=0;i<array1.size();i++)
        {
            Reader a=new Reader();
            a=array1.get(i);
            if(a.getName().equals(line)&&a.getNum()==nu){
                System.out.println("您的信息是：\n"+a.getNum() + "," + a.getName() + "," + a.getCollege() + "," + a.getClasss());
                n=i;
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的学生信息不存在！");
            return;
        }
        System.out.println("请输入修改后的姓名：");
        String name=sc.nextLine();
        System.out.println("请输入修改后的学号(仅能输入数字)：");
        int h = Integer.parseInt(sc.nextLine());
        System.out.println("请输入修改后的学院：");
        String College=sc.nextLine();
        System.out.println("请输入修改后的专业班级：");
        String Classs=sc.nextLine();
        Reader s=new Reader();
        s.setName(name);
        s.setNum(h);
        s.setCollege(College);
        s.setClass(Classs);
        array1.set(n,s);
        FileWriter fr=new FileWriter("myFile\\reader.txt");
        BufferedWriter br=new BufferedWriter(fr);
        for(int i=0;i<array1.size();i++) {
            Reader a=new Reader();
            a=array1.get(i);
            br.write(a.getNum()+","+a.getName()+","+a.getCollege()+","+a.getClasss()+"\r\n");
        }
        System.out.println("修改读者信息成功！");
        System.out.print("修改后的读者信息：\n"+s.getNum() + "," + s.getName() + "," + s.getCollege() + "," + s.getClasss() );
        br.close();
        fr.close();
    }
}

3.查找

package functions;

import EntityClass.Book;
import EntityClass.Borrow;
import EntityClass.Reader;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Find {
    public static void findbook(ArrayList<Book> arrayList) throws IOException {
        System.out.println("1、按书名查询");
        System.out.println("2、按作者名查询");
        System.out.println("3、按出版社查询");
        Scanner sc = new Scanner(System.in);
        int s = sc.nextInt();
        switch (s) {
            case 1:
                findbook1();
                break;
            case 2:
                findbook2();
                break;
            case 3:
                findbook3();
                break;
        }
    }
    public static void findbook1() throws IOException{
        System.out.println("请输入书名：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Book> array1=io.inbook();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Book a=new Book();
            a=array1.get(i);
            if(a.getName().equals(line)){
                System.out.println("您要找的书籍是：\n"+a.getNum() + "," + a.getName() + "," + a.getAuthor() + "," + a.getPrice() + "," + a.getQuantity() + "," + a.getDate() + "," + a.getPress());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的书籍不存在！");
        }
    }

    public static void findbook2() throws IOException{
        System.out.println("请输入作者名：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Book> array1=io.inbook();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Book a=new Book();
            a=array1.get(i);
            if(a.getAuthor().equals(line)){
                System.out.println("您要找的书籍是：\n"+a.getNum() + "," + a.getName() + "," + a.getAuthor() + "," + a.getPrice() + "," + a.getQuantity() + "," + a.getDate() + "," + a.getPress());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的书籍不存在！");
        }
    }
    public static void findbook3() throws IOException{
        System.out.println("请输入出版社：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Book> array1=io.inbook();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Book a=new Book();
            a=array1.get(i);
            if(a.getPress().equals(line)){
                System.out.println("您要找的书籍是：\n"+a.getNum() + "," + a.getName() + "," + a.getAuthor() + "," + a.getPrice() + "," + a.getQuantity() + "," + a.getDate() + "," + a.getPress());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的书籍不存在！");
        }
    }
    public static void findreader(ArrayList<Reader> arrayList) throws IOException {
        System.out.println("1、按学号查询");
        System.out.println("2、按姓名查询");
        System.out.println("3、按专业班级查询");
        Scanner sc = new Scanner(System.in);
        int s = sc.nextInt();
        switch (s) {
            case 1:
                findreader1();
                break;
            case 2:
                findreader2();
                break;
            case 3:
                findreader3();
                break;
        }
    }

    public static void findreader1() throws IOException{
        System.out.println("请输入学号：");
        Scanner sc=new Scanner(System.in);
        String lin=sc.nextLine();
        int line=Integer.parseInt(lin);
        ArrayList<Reader> array1=io.inreader();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Reader a=new Reader();
            a=array1.get(i);
            if(a.getNum()==line){
                System.out.println("您要找的学生信息是：\n"+a.getNum() + "," + a.getName() + "," + a.getCollege() + "," + a.getClasss());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的学生信息不存在！");
        }
    }
    public static void findreader2() throws IOException{
        System.out.println("请输入姓名：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Reader> array1=io.inreader();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Reader a=new Reader();
            a=array1.get(i);
            if(a.getName().equals(line)){
                System.out.println("您要找的学生信息是：\n"+a.getNum() + "," + a.getName() + "," + a.getCollege() + "," + a.getClasss());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的学生信息不存在！");
        }
    }
    public static void findreader3() throws IOException{
        System.out.println("请输入专业班级：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Reader> array1=io.inreader();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Reader a=new Reader();
            a=array1.get(i);
            if(a.getClasss().equals(line)){
                System.out.println("您要找的学生信息是：\n"+a.getNum() + "," + a.getName() + "," + a.getCollege() + "," + a.getClasss());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的学生信息不存在！");
        }
    }
    public static void findborrow(ArrayList<Borrow> arrayList) throws IOException {
        System.out.println("1、按学号查询");
        System.out.println("2、按书名查询");
        System.out.println("3、按书号查询");
        Scanner sc = new Scanner(System.in);
        int s = sc.nextInt();
        switch (s) {
            case 1:
                findborrow1();
                break;
            case 2:
                findborrow2();
                break;
            case 3:
                findborrow2();
                break;
        }
    }

    public static void findborrow1() throws IOException{
        System.out.println("请输入学号：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Borrow> array1=io.inborrow();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Borrow a=new Borrow();
            a=array1.get(i);
            if(a.getNum1()==Integer.parseInt(line)){
                System.out.println("您要找的书籍是：\n"+a.getNum1()+","+a.getName()+","+a.getNum2()+","+a.getBookname()+","+a.getBorrowdate()+","+a.getShouldreturndate()+","+a.getReturndate());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的借阅信息不存在！");
        }
    }
    public static void findborrow2() throws IOException{
        System.out.println("请输入书名：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Borrow> array1=io.inborrow();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Borrow a=new Borrow();
            a=array1.get(i);
            if(a.getBookname().equals(line)){
                System.out.println("您要查询的借阅信息是：\n"+a.getNum1()+","+a.getName()+","+a.getNum2()+","+a.getBookname()+","+a.getBorrowdate()+","+a.getShouldreturndate()+","+a.getReturndate());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的借阅信息不存在！");
        }
    }
    public static void findborrow3() throws IOException{
        System.out.println("请输入书号：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Book> array1=io.inborrow();
        boolean bool=false;
        for(int i=0;i<array1.size();i++)
        {
            Borrow a=new Borrow();
            a=array1.get(i);
            if(a.getNum2()==Integer.parseInt(line)){
                System.out.println("您要查询的借阅信息是：\n"+a.getNum1()+","+a.getName()+","+a.getNum2()+","+a.getBookname()+","+a.getBorrowdate()+","+a.getShouldreturndate()+","+a.getReturndate());
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的借阅信息不存在！");
        }
    }
}

4.排序

package functions;

import EntityClass.Book;
import EntityClass.Reader;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class sort { 
        public static void sentakusort() throws IOException {
        System.out.println("您要选择哪种方法进行修改："+"\n"+"1、使用书号\n2、使用书名");
        int s;
        Scanner sc = new Scanner(System.in);
        while (true)
        {
            s = sc.nextInt();
            if(s!=1&&s!=2)
                System.out.println("输入有误，请重新输入");
            else break;
        }

        switch (s){
            case 1:
                sortingBook1(io.inbook());
                break;
            case 2:
                sortingBook2(io.inbook());
                break;
        }
    }
    //使用书号排列输出
    public static void sortingBook1(ArrayList<Book> array) {
       int[] arr = new int[100];
       for (int i = 0; i < array.size(); i++) {
           Book b = array.get(i);
            arr[i] = b.getNum();
       }
        for (int i1 = 0; i1 < array.size() - 1; i1++) {
            for (int j = 0; j < array.size() - 1 - i1; j++) {
                Book book1 = array.get(j);
                Book book2 = array.get(j+1);
                if (book1.getNum()>book2.getNum()) {
                    int temp=arr[j];
                   arr[j]=arr[j+1];
                   arr[j+1]=temp;
                    Collections.swap(array, j, j + 1);
                }
            }
        }
        System.out.println("已完成排序+\n排序后的列表：\n");
        for (int i = 0; i < array.size(); i++) {
            Book a = array.get(i);
            System.out.println(a.getNum()+","+a.getName()+","+a.getAuthor()+","+a.getPrice()+","+a.getQuantity()+","+a.getDate()+","+a.getPress());
        }
    }
    //使用书名进行排序
    public static void sortingBook2(ArrayList<Book> array) {
       int[] arr = new int[100];
        for (int i = 0; i < array.size(); i++) {
           Book b = array.get(i);
            arr[i] = b.getNum();
       }
        for (int i1 = 0; i1 < array.size() - 1; i1++) {
            for (int j = 0; j < array.size() - 1 - i1; j++) {
                Book book1 = array.get(j);
                Book book2 = array.get(j+1);
                int bool= book1.getName().compareTo(book2.getName());
                if (bool>0) {
                   int temp=arr[j];
                   arr[j]=arr[j+1];
                   arr[j+1]=temp;
                    Collections.swap(array, j, j + 1);
                }
            }
        }
        System.out.println("已完成排序\n排序后的列表：\n");
        for (int i = 0; i < array.size(); i++) {
            Book a = array.get(i);
            System.out.println(a.getNum()+","+a.getName()+","+a.getAuthor()+","+a.getPrice()+","+a.getQuantity()+","+a.getDate()+","+a.getPress());
        }
    }
    public static void sentakusortreader() throws IOException {
        System.out.println("您要选择哪种方法进行修改："+"\n"+"1、使用学号\n2、使用学院");
        int s;
        Scanner sc = new Scanner(System.in);
        while (true)
        {
            s = sc.nextInt();
            if(s!=1&&s!=2)
                System.out.println("输入有误，请重新输入");
            else break;
        }

        switch (s){
            case 1:
                sortingreader1(io.inreader());
                break;
            case 2:
                sortingreader2(io.inreader());
                break;
        }
    }

    public static void sortingreader1(ArrayList<Reader> array) { //使用学号排列输出
        int[] arr = new int[100];
        for (int i = 0; i < array.size(); i++) {
            Book b = array.get(i);
           arr[i] = b.getNum();
        }
        for (int i1 = 0; i1 < array.size() - 1; i1++) {
            for (int j = 0; j < array.size() - 1 - i1; j++) {
                Reader book1 = array.get(j);
                Reader book2 = array.get(j+1);
                if (book1.getNum()>book2.getNum()) {
                    int temp=arr[j];
                    arr[j]=arr[j+1];
                   arr[j+1]=temp;
                    Collections.swap(array, j, j + 1);
                }
            }
        }
        System.out.println("已完成排序\n排序后的列表：\n");
        for (int i = 0; i < array.size(); i++) {
            Reader a = array.get(i);
            System.out.println(a.getNum()+","+a.getName()+","+a.getCollege()+","+a.getCollege());
        }
    }

    public static void sortingreader2(ArrayList<Reader> array) {//使用学院进行排序
        int[] arr = new int[100];
        for (int i = 0; i < array.size(); i++) {
            Book b = array.get(i);
            arr[i] = b.getNum();
        }
        for (int i1 = 0; i1 < array.size() - 1; i1++) {
            for (int j = 0; j < array.size() - 1 - i1; j++) {
                Reader book1 = array.get(j);
                Reader book2 = array.get(j+1);
                int bool= book1.getName().compareTo(book2.getName());
                if (bool>0) {
                    int temp=arr[j];
                    arr[j]=arr[j+1];
                    arr[j+1]=temp;
                    Collections.swap(array, j, j + 1);
                }
            }
        }
        System.out.println("已完成排序\n排序后的列表：\n");
        for (int i = 0; i < array.size(); i++) {
            Reader a = array.get(i);
            System.out.println(a.getNum()+","+a.getName()+","+a.getCollege()+","+a.getCollege());
        }
    }
}

5.删除

package functions;

import EntityClass.Book;
import EntityClass.Reader;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Delete {
    public static void sentakudelete1() throws IOException{
        System.out.println("您要选择哪种方法进行删除？："+"\n"+"1、使用书名\n2、使用书号");
        int s;
        Scanner sc = new Scanner(System.in);
        while (true)
        {
            s = sc.nextInt();
            if(s!=1&&s!=2)
                System.out.println("输入有误，请重新输入");
            else break;
        }

        switch (s){
            case 1:
                detelebook1();
                break;
            case 2:
                detelebook2();
                break;
        }
    }
    public static void detelebook1() throws IOException{
        //用书名删除书籍
        System.out.println("请输入书名：");
        Scanner sc=new Scanner(System.in);
        String line=sc.nextLine();
        ArrayList<Book> array1=io.inbook();
        boolean bool=false;
        int n=0;
        for(int i=0;i<array1.size();i++)
        {
            Book a=new Book();
            a=array1.get(i);
            if(a.getName().equals(line)){
                System.out.println("您要找的书籍是：\n"+a.getNum() + "," + a.getName() + "," + a.getAuthor() + "," + a.getPrice() + "," + a.getQuantity() + "," + a.getDate() + "," + a.getPress());
                n=i;
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的书籍不存在！");
            return;
        }
        array1.remove(n);
        System.out.println("删除成功！");
        FileWriter fr=new FileWriter("myFile\\book.txt");
        BufferedWriter br=new BufferedWriter(fr);
        for(int i=0;i<array1.size();i++) {
            Book a=new Book();
            a=array1.get(i);
            br.write(a.getNum()+","+a.getName()+","+a.getAuthor()+","+a.getPrice()+","+a.getQuantity()+","+a.getDate()+","+a.getPress()+"\r\n");
        }
        System.out.println("修改图书信息成功！");
        br.close();
        fr.close();
    }
    public static void detelebook2() throws IOException{//用书号删除书籍
        System.out.println("请输入书号：");
        Scanner sc=new Scanner(System.in);
        int line=sc.nextInt();
        ArrayList<Book> array1=io.inbook();
        boolean bool=false;
        int n=0;
        for(int i=0;i<array1.size();i++)
        {
            Book a=new Book();
            a=array1.get(i);
            if(a.getNum()==line){
                System.out.println("您要找的书籍是：\n"+a.getNum() + "," + a.getName() + "," + a.getAuthor() + "," + a.getPrice() + "," + a.getQuantity() + "," + a.getDate() + "," + a.getPress());
                n=i;
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的书籍不存在！");
            return;
        }
        ArrayList<Book> array2=new ArrayList<>();
        for (int i = 0; i < array1.size() - 1; i++) {
            if (i < n) {
                array2.set(i, array1.get(i));
            } else {
                array2.set(i, array1.get(i + 1));
            }
        }
        array1.remove(n);
        System.out.println("删除成功！");
        FileWriter fr=new FileWriter("myFile\\book.txt");
        BufferedWriter br=new BufferedWriter(fr);
        for(int i=0;i<array1.size();i++) {
            Book a=new Book();
            a=array1.get(i);
            br.write(a.getNum()+","+a.getName()+","+a.getAuthor()+","+a.getPrice()+","+a.getQuantity()+","+a.getDate()+","+a.getPress()+"\r\n");
        }
        System.out.println("修改图书信息成功！");
        br.close();
        fr.close();
    }
    public static void detelebook3() throws IOException{//按照学号+姓名删除信息
        ArrayList<Reader> array1=io.inreader();
        ArrayList<Reader> array2 = null;
        boolean bool=false;
        int n=0;
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入学号:");
        int nu=sc.nextInt();
        System.out.println("请输入姓名:");
        String l=sc.nextLine();
        String line=sc.nextLine();
        for(int i=0;i<array1.size();i++)
        {
            Reader a=new Reader();
            a=array1.get(i);
            if(a.getName().equals(line)&&a.getNum()==nu){
                System.out.println("您的信息是：\n"+a.getNum() + "," + a.getName() + "," + a.getCollege() + "," + a.getClasss());
                n=i;
                bool=true;
            }
        }
        if(bool==false){
            System.out.println("您要查找的学生信息不存在！");
            return;
        }
        array1.remove(n);
        System.out.println("删除成功！");
        FileWriter fr=new FileWriter("myFile\\reader.txt");
        BufferedWriter br=new BufferedWriter(fr);
        for(int i=0;i<array1.size();i++) {
            Reader a=new Reader();
            a=array1.get(i);
            br.write(a.getNum()+","+a.getName()+","+a.getCollege()+","+a.getClasss()+"\r\n");
        }
        System.out.println("修改读者信息成功！");
        br.close();
        fr.close();
    }
}

基本类

1.Book

package EntityClass;

public class Book extends Borrow {

    private  String name;//书名
    private  String author;//作者
    private  String price;//价格
    private  int num;//书号
    private  String press;//出版社
    private  String date;//出版日期
    private  int quantity;//存馆数量


    public Book() {
    }

    public Book(String name, String author, String price, int num, String press, String date, int quantity) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.num = num;
        this.press = press;
        this.date = date;
        this.quantity = quantity;
    }

    public  String getName() {
        return name;
    }

    public String getAuthor() {
        return author;
    }

    public String getPrice() {
        return price;
    }

    public int getNum() {
        return num;
    }

    public String getPress() {
        return press;
    }

    public String getDate() {
        return date;
    }

    public int getQuantity() {
        return quantity;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public void setPrice(String price) {
        this.price = price;
    }

    public void setNum(int num) {
        this.num = num;
    }

    public void setPress(String press) {
        this.press = press;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
    
}

2.Borrow

package EntityClass;
public class Borrow {
    private String name;//姓名
    private int num1; //学号
    private int num2;//书号
    private String bookname; //书名
    private String borrowdate;//借阅日期
    private String Shouldreturndate;//应还日期
    private String returndate;//实际归还日期
    public Borrow() {
    }

    public Borrow(String name, int num1, int num2, String bookname, String borrowdate, String shouldreturndate, String returndate) {
        this.name = name;
        this.num1 = num1;
        this.num2 = num2;
        this.bookname = bookname;
        this.borrowdate = borrowdate;
        Shouldreturndate = shouldreturndate;
        this.returndate = returndate;
    }

    public String getName() {
        return name;
    }

    public int getNum1() {
        return num1;
    }

    public int getNum2() {
        return num2;
    }

    public String getBookname() {
        return bookname;
    }

    public String getBorrowdate() {
        return borrowdate;
    }

    public String getShouldreturndate() {
        return Shouldreturndate;
    }

    public String getReturndate() {
        return returndate;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setNum1(int num1) {
        this.num1 = num1;
    }

    public void setNum2(int num2) {
        this.num2 = num2;
    }

    public void setBookname(String bookname) {
        this.bookname = bookname;
    }

    public void setBorrowdate(String borrowdate) {
        this.borrowdate = borrowdate;
    }

    public void setShouldreturndate(String shouldreturndate) {
        Shouldreturndate = shouldreturndate;
    }

    public void setReturndate(String returndate) {
        this.returndate = returndate;
    }
}

3.Reader

package EntityClass;
public class Reader extends Book {
    private  String name;//姓名
    private  int num;//学号
    private  String college;//学院专业
    private  String Classs;//班级

    public Reader(String name, int num, String college, String aClass) {
        this.name = name;
        this.num = num;
        this.college = college;
        Classs = aClass;
    }

    public Reader() {

    }

    public String getName() {
        return name;
    }

    public int getNum() {
        return num;
    }

    public String getCollege() {
        return college;
    }

    public String getClasss() {
        return Classs;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setNum(int num) {
        this.num = num;
    }

    public void setCollege(String college) {
        this.college = college;
    }

    public void setClass(String aClass) {
        Classs = aClass;
    }
}