feat(java-lesson): java实验3-实现图书租阅管理系统

- 新增 Book、RentBook、VIPReader 类- 实现 RentBookManage 和 RentBookManagenew 类的图书管理功能
- 添加 PayException 异常类和 DecF 工具类
- 编写测试类 Test、TestRentBookManage 和 TestRentBookManageNew

java-lesson/pom.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>cn.vscoder</groupId>
+    <artifactId>java-lesson</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

java-lesson/src/main/java/cn/vscoder/experiment_3/book/Book.java

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+package cn.vscoder.experiment_3.book;
+
+public class Book {
+    /* 定义类的5个成员变量：书号、书名、作者、出版社、定价*/
+    public String ISBN;                //存储国际标准书号
+    public String bookName;      //存储书名
+    public String author;             //存储作者
+    public String publisher;        //存储出版社
+    private double  price;             //存储书的定价
+
+    public Book(String ISBN, String bookName, String author, String publisher, double price) {
+        this.ISBN = ISBN;
+        this.bookName = bookName;
+        this.author = author;
+        this.publisher = publisher;
+        this.price = price;
+    }
+
+    public String getISBN() {
+        return ISBN;
+    }
+
+    public String getBookName() {
+        return bookName;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public String getPublisher() {
+        return publisher;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return "图书信息：" +
+                "ISBN='" + ISBN + '\'' +
+                ", 书名='" + bookName + '\'' +
+                ", 作者='" + author + '\'' +
+                ", 出版社='" + publisher + '\'' +
+                ", 定价=" + price;
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/book/RentBook.java

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+package cn.vscoder.experiment_3.book;
+
+public class RentBook extends Book {
+    private String bookNo;//入库编号
+    private boolean state;//是否可借 true:可借
+
+    public RentBook(String ISBN, String bookName, String author, String publisher, double price, String bookNo) {
+        super(ISBN, bookName, author, publisher, price);
+        this.bookNo = bookNo;
+        state = true;//默认可借
+    }
+
+    public String getBookNo() {
+        return bookNo;
+    }
+
+    public void setBookNo(String bookNo) {
+        this.bookNo = bookNo;
+    }
+
+    public boolean isState() {
+        return state;
+    }
+
+    public void setState(boolean state) {
+        this.state = state;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() +
+                ",入库编号='" + bookNo + '\'' +
+                ", 是否可借=" + state;
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/common/DecF.java

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+package cn.vscoder.experiment_3.common;
+
+/* 自定义一个对double型数据的小数点只显示2位的专用类 */
+
+import java.text.NumberFormat;
+import java.math.BigDecimal;
+
+public class DecF
+{
+   public static String DecS(Double x) //方法：返回保留两位小数的字符串
+   {
+	   NumberFormat df = NumberFormat.getNumberInstance();
+	   df.setMaximumFractionDigits(2);
+	   return df.format(x);
+   }
+
+   public static double DecD(Double x) //方法：返回保留两位小数的Double值
+   {
+	    x = new BigDecimal(x)
+			    .setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
+		return x;
+	}
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/common/PayException.java

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+package cn.vscoder.experiment_3.common;
+
+public class PayException extends Exception {
+    String s;
+
+    public PayException() {
+        s = "余额不足以支付租金。";
+    }
+
+    //输出异常信息
+    public String toString() {
+        return s;
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/common/Promotion.java

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+package cn.vscoder.experiment_3.common;
+
+public interface Promotion {
+    static final int promtpoints = 1000;
+
+    abstract void promotion(String level);
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/reader/Reader.java

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+package cn.vscoder.experiment_3.reader;
+
+public class Reader {
+    public int readerID;
+    protected String readerName;
+    protected String readerPwd;
+    protected double balance;
+
+    private static int nextReaderID;
+
+    static{
+        nextReaderID=10001;
+    }
+
+    public Reader() {
+        readerID=nextReaderID++;
+        readerName="";
+        readerPwd="666666";
+        balance=0;
+    }
+
+    public Reader(String readerName) {
+        this();
+        this.readerName = readerName;
+    }
+
+    public int getReaderID() {
+        return readerID;
+    }
+
+    public String getReaderName() {
+        return readerName;
+    }
+
+    public String getReaderPwd() {
+        return readerPwd;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+    //修改密码，密码必须为6位
+    public void changePwd(String oldPwd,String newPwd){
+        if (oldPwd.equals(this.readerPwd)){
+            if (newPwd.length()==6){
+                this.readerPwd=newPwd;
+                System.out.println("密码修改成功！");
+
+            }else{
+                System.out.println("密码必须为6位！");
+            }
+        }
+    }
+    //充值功能。充值不能小于0
+    public void setBalance(double balance) {//充值
+        if (balance<0){
+            System.out.println("充值金额不能小于0！");
+        }else {
+        this.balance += balance;}
+    }
+    @Override
+    public String toString() {
+        return "读者信息：" +
+                "readerID=" + readerID +
+                ", 读者姓名='" + readerName + '\'' +
+                ", 密码='" + readerPwd + '\'' +
+                ", 余额=" + balance ;
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/reader/VIPReader.java

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+package cn.vscoder.experiment_3.reader;
+
+import cn.vscoder.experiment_3.common.PayException;
+import cn.vscoder.experiment_3.common.Promotion;
+
+public class VIPReader extends Reader implements Promotion {
+    private String readerGrade;//读者级别
+    private double percent;//折扣率
+    private int bonusPoints;//积分
+
+    public VIPReader(String readerName, String readerGrade) {
+        super(readerName);
+        this.readerGrade = readerGrade;
+        setPercent();//设置折扣率
+        bonusPoints = 0;
+    }
+
+    public String getReaderGrade() {
+        return readerGrade;
+    }
+
+    public void setReaderGrade(String readerGrade) {
+        this.readerGrade = readerGrade;
+    }
+
+    public double getPercent() {
+        return percent;
+    }
+
+    public void setPercent() {
+        if (readerGrade.equals("VIP")) {
+            this.percent = 0.8;//8折
+
+        } else if (readerGrade.equals("普通会员")) {
+            this.percent = 0.9;//9折
+        } else {//非会员
+            this.percent = 1;//不打折
+        }
+    }
+
+    public boolean payRent(double money) throws PayException {//支付
+//        if (this.getBalance() >= money) {
+//            this.balance = this.balance - money;
+//            return true;
+//        } else {
+//            System.out.println("余额不足，请及时充值！");
+//            return false;
+//        }
+        if (this.balance < money) {
+            throw new PayException();     //当余额不足支付租金时抛出支付异常
+        } else {
+            balance = balance - money;
+            return true;
+        }
+    }
+
+    public int getBonusPoints() {
+        return bonusPoints;
+    }
+
+    public void setBonusPoints(int bonusPoints) {//积分
+        this.bonusPoints += bonusPoints;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() +
+                ",读者级别='" + readerGrade + '\'' +
+                ", 折扣率=" + percent +
+                ", 积分=" + bonusPoints;
+    }
+
+    @Override
+    public void promotion(String level)          //实现接口中的抽象方法
+    {
+        if (this.getBonusPoints() >= promtpoints)   //如果会员积分超过晋级标准
+        {
+            switch (level) {
+                case "VIP":
+                    this.balance += 10;
+                    break;     //对VIP会员，1000积分返利10元
+                case "普通会员":
+                    this.readerGrade = "VIP";
+                    break; //对普通会员，达到1000积分则晋级为VIP会员
+                case "非会员":
+                    this.readerGrade = "普通会员";
+                    break;//非会员达到1000积分则晋级为普通会员
+            }
+            bonusPoints -= promtpoints;    //晋级后，会员积分-晋级标准分
+        } else
+            readerGrade = level;  //积分不达标，身份不变
+        setPercent();               //调用设置折扣的方法
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/rent/RentBookManage.java

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+package cn.vscoder.experiment_3.rent;
+
+import cn.vscoder.experiment_3.book.RentBook;
+import cn.vscoder.experiment_3.common.PayException;
+import cn.vscoder.experiment_3.reader.VIPReader;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+
+public class RentBookManage {
+    //租阅期限deadTime
+    int deadTime = 30;
+    double normalRent = 0.5;//正常租阅费用
+    double delayRent = 1.0;//超期租阅费用
+    int rentDays;
+    double rent;//租阅费用
+
+    public ArrayList<VIPReader> readerlist;//读者列表
+    LinkedList<RentBook> booklist;//图书列表
+    ArrayList<String> rentlist;//租阅记录
+    VIPReader renter;//借阅者
+    RentBook rentbook;
+
+    public RentBookManage() {//创建空的列表
+        booklist = new LinkedList<>();
+        readerlist = new ArrayList<>();
+        rentlist = new ArrayList<>();
+    }
+
+    //图书管理相关功能、添加图书、删除图书、打印图书列表、修改图书价格、查找图书
+    public void addBook(RentBook rentBook) {
+        booklist.add(rentBook);
+    }
+
+    public void addBook(String isbn, String bookname, String author, String publisher, double price, String inNo) {
+        booklist.add(new RentBook(isbn, bookname, author, publisher, price, inNo));
+    }
+
+    public void addBook(int i, RentBook rentBook) {//指定位置，添加图书
+        booklist.add(i - 1, rentBook);
+    }
+
+    public RentBook searchBook(String bookName) {//根据书名查找图书
+        for (int j = 0; j < booklist.size(); j++) {
+            if (booklist.get(j).getBookName().equals(bookName)) {
+                System.out.println(booklist.get(j));
+                return booklist.get(j);
+            }
+        }
+        System.out.println("您要查找的图书：" + bookName + "不存在！");
+        return null;
+
+    }
+
+    public void editBook(String bookName, double newprice) {
+        for (int j = 0; j < booklist.size(); j++) {
+            if (booklist.get(j).getBookName().equals(bookName)) {
+                booklist.get(j).setPrice(newprice);
+                System.out.println(booklist.get(j));
+                return;
+            }
+        }
+        System.out.println("您要查找的图书：" + bookName + "不存在！");
+
+    }
+
+    public void deleteBook(String bookName) {
+        for (int j = 0; j < booklist.size(); j++) {
+            if (booklist.get(j).getBookName().equals(bookName)) {
+                booklist.remove(j);
+                System.out.println("删除" + bookName + "成功！");
+                return;
+            }
+        }
+        System.out.println("您要删除的图书：" + bookName + "不存在！");
+
+    }
+
+    public void displayAllBooks() {
+        for (RentBook rentBook : booklist) {
+            System.out.println(rentBook);
+        }
+    }
+
+    //读者，添加读者、显示所有读者
+    public void addReader(String name, String grade) {
+        readerlist.add(new VIPReader(name, grade));
+    }
+
+    public void addReader(VIPReader vipReader) {
+        readerlist.add(vipReader);
+    }
+
+    public void displayAllReaders() {
+        for (VIPReader vipReader : readerlist) {
+            System.out.println(vipReader);
+        }
+    }
+
+    //计算租金
+    public double setRent() {
+        if (rentDays <= deadTime) {
+            rent = rentDays * normalRent * renter.getPercent();
+        } else {
+            rent = ((rentDays - deadTime) * delayRent + normalRent * deadTime) * renter.getPercent();
+        }
+        return rent;
+    }
+
+    //支付租金
+    public boolean renting() throws PayException {
+        setRent();
+        if (renter.payRent(rent)) {
+            System.out.println(renter.getReaderName() + "支付租金：" + rent + "成功！");
+            return true;
+        } else {
+            System.out.println(renter.getReaderName() + "的账号余额为：" + renter.getBalance() + "不足以支付租金" + rent);
+            return false;
+        }
+    }
+
+    //租阅功能
+    public boolean rentBook(VIPReader vr, RentBook bk, int days) throws PayException {
+        rentbook = bk;
+        renter = vr;
+        rentDays = days;
+        if (renting()) {
+            renter.setBonusPoints(rentDays);//给借阅者积分
+            rentlist.add("读者：" + renter.getReaderName() + "\t读者等级：" + renter.getReaderGrade() + "\t借阅图书为：" + bk.getBookName() + "\t租书天数：" + rentDays + "\t租金:" + rent + "读者当前积分" + renter.getBonusPoints() + "\t读者账户余额" + renter.getBalance());
+            return true;
+        } else {
+            System.out.println("支付失败");
+            return false;
+        }
+    }
+
+    //展示借阅记录
+    public void printRentlist() {
+        for (String str : rentlist) {
+            System.out.println(str);
+        }
+    }
+
+    public double getNormalRent() {
+        return normalRent;
+    }
+
+    public void setNormalRent(double normalRent) {
+        this.normalRent = normalRent;
+    }
+
+    public double getDelayRent() {
+        return delayRent;
+    }
+
+    public void setDelayRent(double delayRent) {
+        this.delayRent = delayRent;
+    }
+
+    public int getDeadTime() {
+        return deadTime;
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/rent/RentBookManagenew.java

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+package cn.vscoder.experiment_3.rent;
+
+/* 第3-6题是RentBookManage修改后的图书租赁信息管理类 */
+
+
+import cn.vscoder.experiment_3.book.RentBook;                  // 引入book包中的RentBook类
+import cn.vscoder.experiment_3.reader.VIPReader;            // 引入reader包中的VIPReader类
+import cn.vscoder.experiment_3.common.PayException;            // 引入common包中的PayException异常类
+import java.util.*;                    // 导入常用集合类，如LinkedList和ArrayList
+
+public class RentBookManagenew {       // 类定义，使用public修饰
+
+   /* 1. 定义所需的成员变量 */
+	static final int deadTime = 10;     // 静态常量：规定租期上限天数，final修饰不可修改
+	double normalRent = 0.1;            // 实例变量：正常租金费率
+	double delayRent = 0.4;             // 实例变量：逾期租金费率
+
+	VIPReader renter;                // 当前还书的会员读者对象
+	RentRecord rentrecord;             // 当前操作的租赁记录对象
+
+	public LinkedList<RentBook> booklist;               // 图书列表，保存所有可租图书
+	public ArrayList<VIPReader> readerlist;          // 读者列表，保存所有会员读者
+	public ArrayList<RentRecord> rentlist;              // 租借记录列表
+	public ArrayList<String> returnlist;                // 还书记录信息列表
+
+	int j;  // 循环索引变量
+
+	/* 2. 无参构造函数 */
+	public RentBookManagenew() {
+		booklist = new LinkedList<>();
+		readerlist = new ArrayList<>();
+		rentlist = new ArrayList<>();
+		returnlist = new ArrayList<>();
+	}
+
+    /* 3. 相关getter/setter方法 */
+
+	public static double getDeadTime() {
+		return deadTime;
+	}
+
+	public void setNormalRent(double newNR) {
+		normalRent = newNR;
+	}
+
+	public double getNormalRent() {
+		return normalRent;
+	}
+
+	public void setDelayRent(double newNR) {
+		delayRent = newNR;
+	}
+
+	public double getDelayRent() {
+		return delayRent;
+	}
+
+   /* 4. 图书信息操作相关方法 */
+
+	public void addBook(String isbn, String bname, String bauthor, String bpublisher, double bprice, String no) {
+		booklist.add(new RentBook(isbn, bname, bauthor, bpublisher, bprice, no));
+	}
+
+	public void addBook(int i, String isbn, String bname, String bauthor, String bpublisher, double bprice, String no) {
+		booklist.add(i, new RentBook(isbn, bname, bauthor, bpublisher, bprice, no));
+	}
+
+	public void searchBook(String bookNo) {
+		boolean flag = false;
+		for (j = 0; j < booklist.size(); j++) {
+			if (booklist.get(j).getBookNo().equals(bookNo)) {
+				System.out.println(booklist.get(j));
+				flag = true;
+			}
+		}
+		if (!flag)
+			System.out.println("未找到指定图书。");
+	}
+
+	public void editBook(String isbn, double bprice) {
+		for (j = 0; j < booklist.size(); j++) {
+			if (booklist.get(j).getISBN().equals(isbn)) {
+				booklist.get(j).setPrice(bprice);
+				System.out.println(booklist.get(j));
+			}
+		}
+	}
+
+	public void deleteBook(String isbn) {
+		for (j = 0; j < booklist.size(); j++) {
+			if (booklist.get(j).getISBN().equals(isbn)) {
+				booklist.remove(j);
+				System.out.println("成功删除图书。");
+			}
+		}
+	}
+
+	public void displayBook() {
+		for (RentBook b : booklist)
+			System.out.println(b);
+	}
+
+	/* 5. 读者信息添加与展示 */
+
+	public void addReader(String name, String grade) {
+		readerlist.add(new VIPReader(name, grade));
+	}
+
+	public void displayReader() {
+		for (VIPReader r : readerlist)
+			System.out.println(r);
+	}
+
+	/* 6. 与租赁业务相关的方法 */
+
+	public void addRentRecord(RentBook bk, VIPReader rd, String rdate) {
+		if (rentlist.size() == 0) {
+			rentlist.add(new RentRecord(bk, rd, rdate));
+		} else {
+			boolean flag = true;
+			for (j = 0; j < rentlist.size(); j++) {
+				if (rentlist.get(j).getBookNo().equals(bk.getBookNo())) {
+					System.out.println(rentlist.get(j).getBookNo() + "  已被租借");
+					flag = false;
+				}
+			}
+			if (flag) {
+				rentlist.add(new RentRecord(bk, rd, rdate));
+			}
+		}
+	}
+
+	public void returnBook(RentBook bk, VIPReader rd, String redate) {
+		for (j = 0; j < rentlist.size(); j++) {
+			if (rentlist.get(j).getBookNo().equals(bk.getBookNo())) {
+				renter = rd;
+				rentlist.get(j).setReturnDate(redate);
+				rentlist.get(j).setRent(deadTime, normalRent, delayRent, renter.getPercent());
+				rentlist.get(j).setBonusPoints();
+				renter.setBonusPoints(rentlist.get(j).getBonusPoints());
+				renter.promotion(renter.getReaderGrade());
+
+				if (renting()) {
+					returnlist.add("\n" + renter.getReaderName() + " | " + renter.getReaderGrade() + " 会员账户余额=" + renter.getBalance()
+							+ " 当前积分=" + renter.getBonusPoints() + "\n借阅图书信息: " + rentlist.get(j).toString());
+					rentlist.remove(j);
+				}
+			}
+		}
+	}
+
+	public boolean renting() {
+		try {
+			renter.payRent(rentlist.get(j).getRent());
+			System.out.println(renter.getReaderName() + " 支付租金：" + rentlist.get(j).getRent() + " 成功！");
+			return true;
+		} catch (PayException pe) {
+			System.out.println(renter.getReaderName() + pe);
+			return false;
+		}
+	}
+
+	public void displayRentInfo() {
+		for (RentRecord br : rentlist)
+			System.out.println(br);
+	}
+
+	public void displayReturnInfo() {
+		for (String bre : returnlist)
+			System.out.println(bre);
+	}
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/rent/RentRecord.java

@@ -0,0 +1,118 @@
+package cn.vscoder.experiment_3.rent;
+
+/*例3-5  用来处理图书租阅记录的实体类，设计了6个属性、2个构造方法、9个成员方法、1个内部类 */
+import java.util.*;                     //加载工具类包的类，时间计算需要用到Calendar、Date
+import cn.vscoder.experiment_3.book.RentBook;
+import cn.vscoder.experiment_3.reader.VIPReader;
+import cn.vscoder.experiment_3.common.DecF;            //自定义通用类，对double型值只保留2位小数
+
+public class RentRecord        // 租书记录类
+{
+	private String bookNo;          //被租图书入库编号
+	private int  readerID;          //读者编号
+    private String rentDate="";     //租书日期，格式：20201015
+    private String returnDate="";   //还书日期
+    private  double rents;          //租金
+    private int bonusPoints;        //积分
+
+    public RentRecord(RentBook rb, VIPReader reader, String rentd)
+    {
+		this.bookNo = rb.getBookNo();
+		this.readerID = reader.getReaderID();
+		rentDate = rentd;
+		returnDate = "";
+		rents = 0;
+		bonusPoints = 0;
+	}
+
+	public RentRecord(RentBook rb, VIPReader reader, String rentd, String returnd) //添加public修饰符
+	{
+		this(rb, reader, rentd);
+		returnDate = returnd;
+		bonusPoints = getBonusPoints();
+	}
+
+	public int getReaderID()          //获取读者编号
+	{
+		return readerID;
+	}
+
+	public String getBookNo()         //获取入库号
+	{
+		return bookNo;
+	}
+
+	public void setRentDate(String rentdate)    //设置租书日期
+	{
+		this.rentDate = rentdate;
+	}
+
+	public void setReturnDate(String returndate) //设置还书日期
+	{
+		this.returnDate = returndate;
+	}
+
+	public long sumRentdays()         //计算租阅总天数的成员方法
+	{
+		SumDays sd = new SumDays();   //创建内部类的对象
+        return sd.setRentDays(rentDate, returnDate);  //调用内部类的方法计算租阅总天数
+	}
+
+	public void setRent(int deadTime, double nRent, double dRent, double pencent)   //计算租金
+	{
+		int rentDays = (int)sumRentdays();
+		if(rentDays <= deadTime)
+			rents = DecF.DecD(rentDays * nRent * pencent);  //在规定期限内按正常租阅费率计算租金
+		else
+			rents = DecF.DecD(((rentDays - deadTime) * dRent + deadTime * nRent) * pencent); //超期租金
+	}
+
+	public double getRent()              //获取租金
+	{
+		return rents;
+	}
+
+	public void setBonusPoints()        //计算积分
+	{
+		bonusPoints = bonusPoints + (int)sumRentdays(); //按照租阅天数累积会员积分，每天1分
+	}
+
+	public int getBonusPoints()        //获取积分
+	{
+		return bonusPoints;
+	}
+
+	public String toString()   //重写toString()方法
+	{
+		if(returnDate.length() == 0)   //借书时
+			return " 入库号：" + getBookNo() + "  租借者：" + getReaderID() + " 租书日期：" + rentDate;
+		else //还书时
+			return " 入库号：" + getBookNo() + "  租借者：" + getReaderID() + " 租书日期：" + rentDate +
+			       "  还书日期：" + returnDate + "  租阅天数：" + sumRentdays() + "  积分：" + getBonusPoints() +
+			       "  租金：" + getRent();
+	}
+
+	/* 计算租阅总天数的内部类 */
+	private class SumDays
+	{
+        Calendar c = Calendar.getInstance();
+
+		public long setRentDays(String rentD, String sendD) //根据租书日期和还书日期计算租阅总天数
+		{
+			int y1 = Integer.parseInt(rentD.substring(0, 4));  //提取租书日期的年份
+			int m1 = Integer.parseInt(rentD.substring(4, 6));  //提取租书日期的月份
+			int d1 = Integer.parseInt(rentD.substring(6, 8));  //提取租书日期的日子
+			c.set(y1, m1, d1);                                 //转化为日期型
+			long getDate = c.getTimeInMillis();                //租书时间转化为毫秒数
+
+			int y2 = Integer.parseInt(sendD.substring(0, 4));  //提取还书日期的年份
+			int m2 = Integer.parseInt(sendD.substring(4, 6));  //提取还书日期的月份
+			int d2 = Integer.parseInt(sendD.substring(6, 8));  //提取还书日期的日子
+			c.set(y2, m2, d2);
+			long sendDate = c.getTimeInMillis();               //还书时间转化为毫秒数
+
+			long rentDays = (sendDate - getDate) / (1000 * 60 * 60 * 24); //计算租书和还书日期相差天数
+			return rentDays;
+	    }
+	}
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/test/Test.java

@@ -0,0 +1,27 @@
+package cn.vscoder.experiment_3.test;
+
+import cn.vscoder.experiment_3.book.Book;
+import cn.vscoder.experiment_3.book.RentBook;
+import cn.vscoder.experiment_3.reader.Reader;
+import cn.vscoder.experiment_3.reader.VIPReader;
+
+public class Test {
+    public static void main(String[] args) {
+        Book book=new Book("9787508353937","Head First设计模式","Eric Freeman / Elisabeth Freeman","中国电力出版社",128);
+        System.out.println(book.getBookName());
+        book.setPrice(book.getPrice()*0.8);
+        System.out.println(book);
+        Reader reader1=new Reader();
+        Reader reader2=new Reader();
+        System.out.println(reader1);
+        System.out.println(reader2);
+        RentBook rentBook=new RentBook("97875","设计模式","Eric Freeman","北京大学出版社",128,"in0001");
+        System.out.println(rentBook);
+        VIPReader vipreader1=new VIPReader("张三","VIP");
+        VIPReader vipreader2=new VIPReader("李四","普通会员");
+        VIPReader vipreader3=new VIPReader("王二","非会员");
+        System.out.println(vipreader1);
+        System.out.println(vipreader2);
+        System.out.println(vipreader3);
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/test/TestRentBookManage.java

@@ -0,0 +1,38 @@
+package cn.vscoder.experiment_3.test;
+
+import cn.vscoder.experiment_3.book.RentBook;
+import cn.vscoder.experiment_3.common.PayException;
+import cn.vscoder.experiment_3.reader.VIPReader;
+import cn.vscoder.experiment_3.rent.RentBookManage;
+
+public class TestRentBookManage {
+    public static void main(String[] args) throws PayException {
+        System.out.println("欢迎进入图书租阅管理系统！");
+        RentBookManage bm = new RentBookManage();
+        bm.addBook(new RentBook("0001", "java", "王三", "南京大学出版社", 23.5, "in001"));
+        bm.addBook(new RentBook("0002", "eclipse", "王婆", "北京大学出版社", 53.5, "in002"));
+        bm.addBook(new RentBook("0003", "数据结构", "张斯", "清华大学出版社", 45.5, "in003"));
+        bm.addBook(1, new RentBook("0004", "数据分析", "鱼鱼", "忧伤出版社", 45.3, "in005"));
+        bm.displayAllBooks();
+        RentBook rentBook = bm.searchBook("java");
+        bm.editBook("java", 100);
+        bm.deleteBook("数据分析");
+        bm.displayAllBooks();
+
+        bm.addReader(new VIPReader("张三", "普通会员"));
+        bm.addReader("李四", "VIP");
+        bm.addReader("王二", "非会员");
+        bm.displayAllReaders();
+
+        if (bm.rentBook(bm.readerlist.get(0), bm.searchBook("eclipse"), 10)) {
+            bm.printRentlist();
+        } else {
+            bm.readerlist.get(0).setBalance(100);
+
+        }
+        bm.rentBook(bm.readerlist.get(0), bm.searchBook("eclipse"), 10);
+        bm.printRentlist();
+
+
+    }
+}

java-lesson/src/main/java/cn/vscoder/experiment_3/test/TestRentBookManageNew.java

@@ -0,0 +1,59 @@
+package cn.vscoder.experiment_3.test;
+
+/* 测试功能：测试图书和读者的添加功能，并调用相关方法测试借书与还书功能 */
+import  cn.vscoder.experiment_3.rent.*;       // 导入 rent 包中的所有类
+
+public class TestRentBookManageNew {
+    public static void main(String args[]) {
+        System.out.println("RentBookManagenew 测试程序开始：");
+        RentBookManagenew bm = new RentBookManagenew();
+
+        /* 测试图书的添加和显示 */
+        bm.addBook("978-7-305-13888-3", "Java 课程设计指导", "施伯乐", "南京大学出版社", 31, "IT-202-01");
+        bm.addBook("978-7-103-01234-2", "数据结构", "严蔚敏", "清华大学出版社", 41.2, "IT-401-01");
+        bm.addBook("978-7-113-07777-1", "VB学习与考研指导", "施伯乐", "中国铁道出版社", 35, "IT-301-01");
+
+        bm.displayBook();  // 显示所有图书信息
+
+        System.out.println("\n调用 editBook(“978-7-113-07777-1”, 28.5)：");
+        bm.editBook("978-7-113-07777-1", 28.5);  // 修改图书价格
+
+        /* 测试读者的添加和设置余额 */
+        System.out.println("\n调用 addReader() 和 setBalance(1000 / 500 / 80)：");
+        bm.addReader("张三", "普通会员");
+        bm.addReader("李四", "非会员");
+        bm.addReader("王小强", "VIP");
+        bm.readerlist.get(0).setBalance(1000);  // 第1位读者余额为1000
+        bm.readerlist.get(1).setBalance(500);   // 第2位读者余额为500
+        bm.readerlist.get(2).setBalance(80);    // 第3位读者余额为80
+
+        bm.displayReader();  // 显示所有读者信息
+
+        /* 测试图书租借功能 */
+        System.out.println("\n测试图书租借与归还功能：");
+
+        // 1号读者借了图书1，租借日期：2017年7月7日
+        bm.addRentRecord(bm.booklist.get(0), bm.readerlist.get(0), "20170707");
+
+        // 2号读者借了图书2，租借日期：2019年9月9日
+        bm.addRentRecord(bm.booklist.get(1), bm.readerlist.get(1), "20190909");
+
+        // 2号读者归还图书2，归还日期：2020年2月18日
+        bm.returnBook(bm.booklist.get(1), bm.readerlist.get(1), "20200218");
+
+        // 3号读者借了图书2，租借日期：2020年3月1日
+        bm.addRentRecord(bm.booklist.get(1), bm.readerlist.get(2), "20200301");
+
+        // 2号读者试图归还图书3（未借出），归还日期：2020年6月16日（测试失败情况）
+        bm.returnBook(bm.booklist.get(2), bm.readerlist.get(1), "20200616");
+
+        // 1号读者归还图书1，归还日期：2020年10月1日
+        bm.returnBook(bm.booklist.get(0), bm.readerlist.get(0), "20201001");
+
+        System.out.println("\n显示所有归还记录：");
+        bm.displayReturnInfo();  // 显示所有归还记录
+
+        System.out.println("\n显示当前借阅清单：");
+        bm.displayRentInfo();    // 显示当前仍在借阅的图书记录
+    }
+}