文章目录
book包Book类BookList类operation包AddOperation 类BorrowOperation 类DelOperation类DisplayOperation 类ExitOperation 类FindOperation 类IOperation 类ReturnOperation 类User包AdminUser类NormalUser 类User 类Main 类我们将先前学习的知识运用起来，写一篇图书管理系统简易版链接
book包
Book类
编写每一本书的基本属性和方法
package Book;/*** Created with Intellij IDEA.* Description:每一本书的属性和方法* User: a* Date: -04-15* Time: 14:56*/public class Book {/*** 属性：书名，价格，作者，类型，状态(是否被借出)*/private String name;private String author;private int price;private String type;private boolean isBorrow;//成员变量未初始化默认未false，即未被借出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 isBorrow() {return isBorrow;}public void setBorrow(boolean borrow) {isBorrow = borrow;}@Overridepublic String toString() {return "Book{" +"name='" + name + '\'' +", author='" + author + '\'' +", price=" + price +", type='" + type + '\'' +((isBorrow == true) ? " 已借出 " : " 未借出 ") +'}';}}
BookList类
对整个“书架”操作
package Book;/*** Created with Intellij IDEA.* Description:存储书及其相关信息* User: a* Date: -04-15* Time: 14:56*/public class BookList {//初始值private static int SIZE = 5;//书架容量private Book[] books = new Book[SIZE];//已使用的空间private int usedSize = 0;//初始化书架public BookList() {books[0] = new Book("三国演义","罗贯中",90,"小说");books[1] = new Book("西游记","吴承恩",78,"小说");books[2] = new Book("红楼梦","曹雪芹",89,"小说");books[3] = new Book("水浒传", "施耐庵",91,"小说");books[4] = new Book("推背图","袁天罡",93,"谶颂述");this.usedSize = 5;}//get和set方法public int getUsedSize() {return usedSize;}public void setUsedSize(int usedSize) {this.usedSize = usedSize;}//获取pos下标书public Book getPos(int pos) {return books[pos];}//修改pos位置的书public void setPos(int pos, Book book) {books[pos] = book;}//判断是否满public boolean isFull(int newSize) {return newSize > SIZE ? true : false;}//扩容public void addCapacity() {SIZE *= 2;Book[] newBooks = new Book[SIZE];System.arraycopy(books,0,newBooks,0,usedSize);this.books = newBooks;System.out.println("扩容成功！");}}
operation包
AddOperation 类
package operation;import Book.Book;import Book.BookList;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:增加图书* User: a* Date: -04-15* Time: 14:57*/public class AddOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("新增图书！");System.out.println("请输入图书的名字:");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();System.out.println("请输入图书的作者:");String author = scanner.nextLine();System.out.println("请输入图书的类型:");String type = scanner.nextLine();System.out.println("请输入图书的价格:");int price = scanner.nextInt();Book book = new Book(name,author,price,type);int currentSize = bookList.getUsedSize();if (bookList.isFull(currentSize + 1)) {bookList.addCapacity();}bookList.setPos(currentSize,book);bookList.setUsedSize(currentSize + 1);System.out.println("新增成功！");}}
BorrowOperation 类
package operation;import Book.Book;import Book.BookList;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:借出书* User: a* Date: -04-15* Time: 14:57*/public class BorrowOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("借阅图书！");System.out.println("请输入你要借阅图书的名字:");Scanner input = new Scanner(System.in);String name = input.nextLine();int currentSize = bookList.getUsedSize();int i = 0;for (; i < currentSize; i++) {Book book = bookList.getPos(i);//找到这本书if (book.getName().equals(name)) {//判断其是否被借出if(book.isBorrow() == true) {System.out.println("该书已被借出！");return;} else {book.setBorrow(true);System.out.println("借阅成功！");return;}}}if (i == bookList.getUsedSize()) {System.out.println("没有这本书！");}}}
DelOperation类
package operation;import Book.Book;import Book.BookList;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:删除图书* User: a* Date: -04-15* Time: 14:57*/public class DelOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("删除图书！");System.out.println("请输入你要删除图书的名字:");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();int i = 0;for (; i < bookList.getUsedSize(); i++) {Book book = bookList.getPos(i);if (book.getName().equals(name)) {break;}}//没有找到if (i == bookList.getUsedSize()) {System.out.println("删除图书不存在！");return;}//找到了，正常退出for (int j = i; j < bookList.getUsedSize() - 1; j++) {//这里的boolList内是对象，所以下面的写法是错误的//bookList[j] = bookList[j + 1];Book book = bookList.getPos(j + 1);bookList.setPos(j, book);}int currentSize = bookList.getUsedSize();bookList.setPos(currentSize - 1,null);bookList.setUsedSize(currentSize - 1);System.out.println("删除成功！");}}
DisplayOperation 类
package operation;import Book.Book;import Book.BookList;/*** Created with Intellij IDEA.* Description:展示图书* User: a* Date: -04-15* Time: 14:58*/public class DisplayOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("显示图书！");for (int i = 0; i < bookList.getUsedSize(); i++) {Book book = bookList.getPos(i);System.out.println(book);}}}
ExitOperation 类
package operation;import Book.BookList;/*** Created with Intellij IDEA.* Description:退出系统* User: a* Date: -04-15* Time: 14:58*/public class ExitOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("退出系统");//销毁所有数据for (int i = 0; i < bookList.getUsedSize(); i++) {bookList.setPos(i,null);}System.exit(0);}}
FindOperation 类
package operation;import Book.Book;import Book.BookList;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:查找图书* User: a* Date: -04-15* Time: 14:58*/public class FindOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("查找图书！");System.out.println("请输入你要查找图书的名字:");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();int i = 0;for (; i < bookList.getUsedSize(); i++) {Book book = bookList.getPos(i);if (book.getName().equals(name)) {System.out.println("找到了，信息如下：");System.out.println(book);}}if (i == bookList.getUsedSize()) {System.out.println("图书不存在");}}}
IOperation 类
package operation;import Book.BookList;/*** Created with Intellij IDEA.* Description:* User: a* Date: -04-15* Time: 15:00*/public interface IOperation {void work(BookList bookList);}
ReturnOperation 类
package operation;import Book.Book;import Book.BookList;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:归还图书* User: a* Date: -04-15* Time: 14:59*/public class ReturnOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("归还图书！");System.out.println("请输入你要归还图书的名字:");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();for (int i = 0; i < bookList.getUsedSize(); i++) {Book book = bookList.getPos(i);if (book.getName().equals(name)) {book.setBorrow(false);System.out.println("归还成功");return;}}System.out.println("归还图书不存在！");}}
User包
AdminUser类
package User;import Book.BookList;import operation.*;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:管理员* User: a* Date: -04-15* Time: 15:01*/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()};}@Overridepublic int menu() {System.out.println("Hello" + this.name);System.out.println("1.查找图书");System.out.println("2.增加图书");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("请输入你的操作: ");Scanner input = new Scanner(System.in);int choice = input.nextInt();return choice;}}
NormalUser 类
package User;import operation.*;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:普通用户* User: a* Date: -04-15* Time: 15:01*/public class NormalUser extends User{public NormalUser(String name) {super(name);this.iOperations = new IOperation[] {new ExitOperation(),new FindOperation(),new BorrowOperation(),new ReturnOperation()};}@Overridepublic int menu() {System.out.println("hello "+this.name);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.退出系统");System.out.println("请输入你的操作：");Scanner input = new Scanner(System.in);int choice = input.nextInt();return choice;}}
User 类
package User;import Book.BookList;import operation.IOperation;/*** Created with Intellij IDEA.* Description:* User: a* Date: -04-15* Time: 15:01*/public abstract class User {protected String name;public IOperation[] iOperations;public User(String name) {this.name = name;}public abstract int menu(); //根据选择动态绑定普通用户和管理员//用户操作权限不同，对应功能也不同public void doOperation(int choice, BookList bookList) {iOperations[choice].work(bookList);}}
Main 类
import Book.BookList;import User.User;import User.AdminUser;import User.NormalUser;import java.util.Scanner;/*** Created with Intellij IDEA.* Description:主逻辑* User: a* Date: -04-15* Time: 15:47*/public class Main {//载入用户信息public static User login() {System.out.println("请输入姓名：");Scanner input = new Scanner(System.in);String name = input.nextLine();System.out.println("请输入你的身份：1 -> 管理员 2 -> 普通用户");int choice = input.nextInt();if (choice == 1) {return new AdminUser(name);} else {return new NormalUser(name);}}public static void main(String[] args) {BookList bookList = new BookList();User user = login();while (true) {int choice = user.menu();user.doOperation(choice,bookList);}}}
