目录
一、该图书管理系统涉及Java的知识点
二、该图书管理系统包含的功能
一、该图书管理系统涉及Java的知识点，如下：
数组的增删查抽象类接口面向对象的封装、继承和多态二、该图书管理系统包含的功能，如下：
图书管理系统的使用人群分为两种：①管理人员，②普通用户具体实现：抽象类的继承User类(父类)：
public abstract class User {protected String name;protected IOperation[] iOperations;public User(String name){this.name=name;}public abstract int menu();public void doWork(int choice, BooklList booklList){iOperations[choice].work(booklList);}}
AdminUser类(管理员)
public class AdminUser extends User {public AdminUser(String name){super(name);this.iOperations=new IOperation[] {new ExitOperation(),new FindOperation(),new AddOperation(),new DelOperation(),new DisplayOperation()};}public int menu(){System.out.println("========管理员菜单========");System.out.println("hello "+this.name +"欢迎使用图书管理系统");System.out.println("1.查找图书");System.out.println("2.新增图书");System.out.println("3.删除图书");System.out.println("4.显示图书");System.out.println("0.退出系统");System.out.println("==============================");Scanner scanner=new Scanner(System.in);int choice=scanner.nextInt();return choice;}}
NormalUser类（普通用户类）
public class NormalUser extends User {public NormalUser(String name){super(name);this.iOperations=new IOperation[]{new ExitOperation(),new FindOperation(),new BorrowOperation(),new ReturnOperation()};}public int menu(){System.out.println("========普通用户菜单========");System.out.println("hello "+this.name +"欢迎使用图书管理系统");System.out.println("1.查找图书");System.out.println("2.借阅图书");System.out.println("3.归还图书");System.out.println("0.推出系统");System.out.println("==============================");Scanner scanner=new Scanner(System.in);int choice=scanner.nextInt();return choice;}}
注：需要把上述的三各类放在同一个包里
2. 设计一个Book类存放书的属性，设计一个BookList类存放书的位置
具体实现：在Book类中给所有的私有属性提供了公共的接口，在BookList类中创建了一个名为books的数组并存放三本图书另外设计了一个BookList的成员名为UsedSize来表示在books数组中存放书的数量。
Book类
public class Book {private String name;//书名private String author;//书的作者private int price;//书的价格private String type;//书的类型private boolean isBorrowed;//是否借出public Book(String name, String author, int price, String type) {this.name = name;this.author = author;this.price = price;this.type = type;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public int getPrice() {return price;}public void setPrice(int price) {this.price = price;}public String getType() {return type;}public void setType(String type) {this.type = type;}public boolean isBorrowed() {return isBorrowed;}public void setBorrowed(boolean borrowed) {isBorrowed = borrowed;}@Overridepublic String toString() {return "Book{" +"name='" + name + '\'' +", author='" + author + '\'' +", price=" + price +", type='" + type + '\'' +((isBorrowed==true)?" 已经被借出 ":" 未被借出 ")+'}';}}
BookList类
public class BooklList {private Book[] books=new Book[1024];private int usedSize;public BooklList(){books[0]=new Book("数据库应用原理","张三",45,"计算机");books[1]=new Book("红楼梦","曹雪芹",56,"小说");books[2]=new Book("唐诗三百首","孙洙",35,"古诗词");this.usedSize=3;}public int getUsedSize() {return usedSize;}public void setUsedSize(int usedSize) {this.usedSize = usedSize;}/*** 获得pos位置的一本书* @param pos* @return*/public Book getPos(int pos){if(pos>=0&&pos<books.length){return this.books[pos];}elseSystem.out.println("pos位置不合法");return this.books[pos];}/*** 添加pos下标的一本书* @param pos* @param book*/public void setBook(int pos,Book book){this.books[pos]=book;}}
注：需要把上述两个类放在当一个包里
3. 分别设计了七个类，每一个类实现一种功能；设计了一个接口把七个类串接起来
具体实现：AddOperation（增加操作）、BorrowOperation（借阅操作）、DelOperation（删除操作）、DisplayOperation（显示操作）、ExitOperation（退出系统）、FindOperation（查找操作）、ReturnOperation（归还操作）和接口IOperation
AddOperation（增加操作）
public class AddOperation implements IOperation{public void work(BooklList booklList){System.out.println("新增图书！");System.out.println("请输入图书的名字：");String name=scanner.nextLine();System.out.println("请输入图书的作者");String author=scanner.nextLine();System.out.println("请输入图书类型");String type=scanner.nextLine();System.out.println("请输入图书价格");int price=scanner.nextInt();scanner.nextLine();Book book=new Book(name,author,price,type);int size=booklList.getUsedSize();booklList.setBook(size,book);booklList.setUsedSize(size+1);System.out.println("新增图书成功！");}}
BorrowOperation（借阅操作）
public class BorrowOperation implements IOperation {public void work(BooklList booklList) {System.out.println("借阅图书！");System.out.println("请输入你想借阅的图书名字");String name = scanner.nextLine();int size = booklList.getUsedSize();for (int i = 0; i < size; i++) {Book book = booklList.getPos(i);if (name.equals(book.getName())) {book.setBorrowed(true);System.out.println("借阅成功！！！");System.out.println("借阅图书信息如下：" + book);return;}}System.out.println("没有找到你要借阅的图书！！！");}}
DelOperation（删除操作）
public class DelOperation implements IOperation {public void work(BooklList booklList) {System.out.println("删除图书！");System.out.println("请输入你要删除的图书的名字");String name = scanner.nextLine();int currentSize = booklList.getUsedSize();int index = 0;int i = 0;for (; i < currentSize; i++) {Book book=booklList.getPos(i);if (book.getName().equals(name)){index=i;break;}}if (i>=currentSize){System.out.println("没有找打你要删除的图书！！！");return;}for (int j = index; j <currentSize-1 ; j++) {Book book=booklList.getPos(j+1);booklList.setBook(j,book);}booklList.setBook(currentSize-1,null);booklList.setUsedSize(currentSize-1);System.out.println("删除成功！！！");}}
DisplayOperation（显示操作）
public class DisplayOperation implements IOperation{public void work(BooklList booklList){System.out.println("打印图书！");int size=booklList.getUsedSize();for (int i = 0; i <size ; i++) {Book book=booklList.getPos(i);System.out.println(book);}}}
ExitOperation（退出系统）
public class ExitOperation implements IOperation{public void work(BooklList booklList){System.out.println("退出系统！");System.exit(0);}}
FindOperation（查找操作）
public class FindOperation implements IOperation{public void work(BooklList booklList){System.out.println("查找图书！");System.out.println("请输入你要查找的图书名字");String name=scanner.nextLine();int size=booklList.getUsedSize();for (int i = 0; i <size ; i++) {Book book=booklList.getPos(i);if (name.equals(book.getName())) {System.out.println("找到了这本书，信息如下：");System.out.println(book);return;}}System.out.println("没有找到你需要借阅的图书！！！");}}
ReturnOperation（归还操作）
public class ReturnOperation implements IOperation {public void work(BooklList booklList) {System.out.println("归还图书！");System.out.println("请输入你要图书的名字");String name = scanner.nextLine();int size = booklList.getUsedSize();for (int i = 0; i < size; i++) {Book book = booklList.getPos(i);if (name.equals(book.getName())) {book.setBorrowed(false);System.out.println("归还成功！！！");System.out.println("归还图书信息如下："+book);return;}}System.out.println("没有你要归还的图书！！！");}}
接口IOperation
public interface IOperation {void work(BooklList booklList);Scanner scanner=new Scanner(System.in);}
注：上述的七个类和一个接口需要放在同一个包里
3. 主类Main,包含一个静态方法Login
Main类
public class Main {public static User login(){System.out.println("请输入你的姓名");Scanner scanner=new Scanner(System.in);String name=scanner.nextLine();System.out.println("请输入你的身份：1——》管理员，2——》普通用户");int choice=scanner.nextInt();if(choice==1){return new AdminUser(name);}else {return new NormalUser(name);}}public static void main(String[] args) {BooklList booklList=new BooklList();User user=login();//向上转型while (true) {int choice = user.menu();//动态绑定,根据choice选择合适的操作user.doWork(choice, booklList);}}}
4.结果图演示
管理员功能演示
普通用户功能演示
