图书管理系统Java（IO流）

import java.io.Serializable;
import java.text.Collator;
import java.util.Locale;

public class Book implements Serializable,Comparable {
    private int number;//数量
    private double price;//价格
    private String bookId;//书号
    private String bookName;//书名
    private String writer;//作者
    private String publishingHouse;//出版社
    private String publicationDate;//出版日期
    public String getBookId() {
        return bookId;
    }

    public void setBookId(String bookId) {
        this.bookId = bookId;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public String getWriter() {
        return writer;
    }

    public void setWriter(String writer) {
        this.writer = writer;
    }

    public String getPublishingHouse() {
        return publishingHouse;
    }

    public void setPublishingHouse(String publishingHouse) {
        this.publishingHouse = publishingHouse;
    }

    public String getPublicationDate() {
        return publicationDate;
    }

    public void setPublicationDate(String publicationDate) {
        this.publicationDate = publicationDate;
    }

    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public double getPrice() {
        return price;
    }

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

    public Book() {
    }

    public Book(String bookId, String bookName, String writer, String publishingHouse, String publicationDate, int number, double price) {
        this.bookId = bookId;
        this.bookName = bookName;
        this.writer = writer;
        this.publishingHouse = publishingHouse;
        this.publicationDate = publicationDate;
        this.number = number;
        this.price = price;
    }

    @Override
    public String toString() {
        return "Book【" +
                "bookId:'" + bookId + ''' +
                ", bookName:'" + bookName + ''' +
                ", writer:'" + writer + ''' +
                ", publishingHouse:'" + publishingHouse + ''' +
                ", publicationDate:'" + publicationDate + ''' +
                ", number:" + number +
                ", price:" + price +
                '】';
    }

    @Override
    public int compareTo(Book o) {
        Collator.getInstance(Locale.CHINA);
        int i = bookName.compareTo(o.bookName);
        if (i == 0){
            for (int i1 = 0; i1 < bookId.length(); i1++) {
                if (bookId.charAt(i1) != o.bookId.charAt(i1)){
                    return bookId.charAt(i1) - o.bookId.charAt(i1);
                }
            }
            return 0;
        }else {
            return i;
        }
    }
}

import java.io.Serializable;

public class BorrowBook implements Serializable {
    private String studentId;//学号
    private String studentName;//学生姓名
    private String bookId;//书号
    private String bookName;//书名
    private String borrowDate;//借书时间
    private String shouldReturnDate;//应还时间
    private String returnDate;//实际还书时间

    public String getStudentId() {
        return studentId;
    }

    public void setStudentId(String studentId) {
        this.studentId = studentId;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }

    public String getBookId() {
        return bookId;
    }

    public void setBookId(String bookId) {
        this.bookId = bookId;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public String getBorrowDate() {
        return borrowDate;
    }

    public void setBorrowDate(String borrowDate) {
        this.borrowDate = borrowDate;
    }

    public String getShouldReturnDate() {
        return shouldReturnDate;
    }

    public void setShouldReturnDate(String shouldReturnDate) {
        this.shouldReturnDate = shouldReturnDate;
    }

    public String getReturnDate() {
        return returnDate;
    }

    public void setReturnDate(String returnDate) {
        this.returnDate = returnDate;
    }

    public BorrowBook() {
    }

    public BorrowBook(String studentId, String studentName, String bookId, String bookName, String borrowDate, String shouldReturnDate, String returnDate) {
        this.studentId = studentId;
        this.studentName = studentName;
        this.bookId = bookId;
        this.bookName = bookName;
        this.borrowDate = borrowDate;
        this.shouldReturnDate = shouldReturnDate;
        this.returnDate = returnDate;
    }

    @Override
    public String toString() {
        return "BorrowBook【" +
                "studentId:'" + studentId + ''' +
                ", studentName:'" + studentName + ''' +
                ", bookId:'" + bookId + ''' +
                ", bookName:'" + bookName + ''' +
                ", borrowDate:'" + borrowDate + ''' +
                ", shouldReturnDate:'" + shouldReturnDate + ''' +
                ", returnDate:'" + returnDate + ''' +
                '】';
    }
}

import java.io.Serializable;
import java.text.Collator;
import java.util.Locale;

public class Reader implements Serializable,Comparable {
    private String studentId;//学号
    private String studentName;//姓名
    private String college;//学院
    private String specialty;//专业
    private String gradeAndClass;//班级

    public String getStudentId() {
        return studentId;
    }

    public void setStudentId(String studentId) {
        this.studentId = studentId;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }

    public String getCollege() {
        return college;
    }

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

    public String getSpecialty() {
        return specialty;
    }

    public void setSpecialty(String specialty) {
        this.specialty = specialty;
    }

    public String getGradeAndClass() {
        return gradeAndClass;
    }

    public void setGradeAndClass(String gradeAndClass) {
        this.gradeAndClass = gradeAndClass;
    }

    public Reader() {
    }

    public Reader(String studentId, String studentName, String college, String specialty, String gradeAndClass) {
        this.studentId = studentId;
        this.studentName = studentName;
        this.college = college;
        this.specialty = specialty;
        this.gradeAndClass = gradeAndClass;
    }

    @Override
    public String toString() {
        return "Reader【" +
                "studentId:'" + studentId + ''' +
                ", studentName:'" + studentName + ''' +
                ", college:'" + college + ''' +
                ", specialty:'" + specialty + ''' +
                ", gradeAndClass:'" + gradeAndClass + ''' +
                '】';
    }

    @Override
    public int compareTo(Reader o) {
        Collator.getInstance(Locale.CHINA);
        //Comparator