この図書館管理システムは、IDEA 開発ツールを使用して実現します
図書館システムへのアクセスには 2 つの ID があります:
1. 管理者 ID:
2. 一般ユーザー ID:
パッケージは合計 3 つあり、ブック、オペレーション、ユーザー実装です。
## 2. メイン パッケージ main 関数 主に一般的な処理、ライブラリの初期化、ライブラリ管理システムへのログイン、および特定の操作の選択、つまり実装を実行します。import book.BookList; import user.AdminUser; import user.NormalUser; import user.User; import java.util.Scanner; public class Main { public static void main(String[] args) { //1.先初始化图书库,以及初始化: BookList bookList = new BookList(); //2.登录 User user = login();//向上转型,User接受管理员或者用户对象 //3.打印菜单,进行具体操作 while(true) { int choice = user.menu(); user.doOperation(choice,bookList); } } }ログイン関数:
public static User login() { System.out.println("请输入你的姓名: "); Scanner scanner = new Scanner(System.in); String userName = scanner.nextLine(); System.out.println("请输入你的身份: 1-> 管理员 2-> 用户"); int choice = scanner.nextInt(); if(choice == 1) { return new AdminUser(userName); }else { return new NormalUser(userName); } }3 . ユーザー パッケージ 管理者と一般ユーザーの 2 つのシステムがあるため、コードの再利用を実現するために共通の属性を User 抽象クラスに抽出します1 . User
package user; import book.BookList; import operations.IOperation; public abstract class User { protected String name; IOperation[] iOperations; public User(String name) { this.name = name; } public abstract int menu(); public void doOperation(int choice, BookList bookList) { iOperations[choice].work(bookList); } }
package user; import operations.*; import java.util.Scanner; 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("欢迎: "+name+"来到图书馆"); System.out.println("**********************************"); 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. 退出图书"); System.out.println("**********************************"); System.out.println("请输入你的操作: "); Scanner scanner = new Scanner(System.in); int choice = scanner.nextInt(); return choice; } }
package user; import operations.*; import java.util.Scanner; 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("欢迎: "+name+"来到图书馆"); System.out.println("**********************************"); 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. 退出图书"); System.out.println("**********************************"); System.out.println("请输入你的操作: "); Scanner scanner = new Scanner(System.in); int choice = scanner.nextInt(); return choice; } }
package book; public class Book { private String name;//书名 private String author;//作者 private int price;//价格 private String type;//书的类型 private boolean isBorrowed;//书默认未借出 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; } @Override public String toString() { return "Book{" + "name='" + name + '\'' + ", author='" + author + '\'' + ", price=" + price + ", type='" + type + '\'' + ","+ ((isBorrowed == true) ? "该书已借出" : "该书未借出" )+ '}'; } }
package book; public class BookList { public Book[] books = new Book[100]; public int usedSize;//用来存当前共有多少本书 /** * 事先通过代码块 * * 事先存进去三本书 */ { books[0] = new Book("java","高斯林",95,"IT"); books[1] = new Book("C++","姚琳",93,"IT"); books[2] = new Book("python","马瑟斯",80,"IT"); this.usedSize = 3; } public Book getPos(int pos) { //获取某一位置的书 return books[pos]; } public void setBooks(Book book,int pos) { //存储一本书 到指定位置 books[pos] = book; } public int getUsedSize() { return usedSize; } public void setUsedSize(int usedSize) { this.usedSize = usedSize; } }
package operations; import book.BookList; public interface IOperation { void work(BookList bookList); }
package operations; import book.Book; import book.BookList; import java.util.Scanner; public class AddOperation implements IOperation{ @Override public void work(BookList bookList) { System.out.println("新增图书! "); System.out.println("请输入要新增的图书的名字: "); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); System.out.println("请输入要新增的图书的作者: "); String author = scanner.nextLine(); System.out.println("请输入要新增的图书的价格: "); int price = scanner.nextInt(); System.out.println("请输入要新增的图书的类型: "); String type = scanner.nextLine(); Book book = new Book(name,author,price,type); //1.获取当前书存放的位置 int curSize = bookList.getUsedSize(); //2.把书放在指定位置 bookList.setBooks(book,curSize); //3.更新书的个数 bookList.setUsedSize(curSize+1); } }3.BorrowOperation本の借用:
package operations; import book.Book; import book.BookList; import java.util.Scanner; public class BorrowOperation implements IOperation{ @Override public void work(BookList bookList) { System.out.println("借阅图书! "); System.out.println("请输入要借阅的图书的名字: "); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); for (int i = 0; i < bookList.getUsedSize(); i++) { Book book = bookList.getPos(i); if(name.equals(book.getName())) { if(book.isBorrowed()) { System.out.println("该书已经被借出! "); }else { book.setBorrowed(true); System.out.println("借阅图书成功! "); return; } } } System.out.println("没有你要借阅的书! "); } }4. DelOperation本の削除:
package operations; import book.Book; import book.BookList; import java.util.Scanner; public class DelOperation implements IOperation{ @Override public void work(BookList bookList) { System.out.println("删除图书! "); System.out.println("请输入要删除的图书: "); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); //查找图书是否有此图书,记录下标 int index = -1; for (int i = 0; i < bookList.getUsedSize(); i++) { Book book = bookList.getPos(i); if(name.equals(book.getName())) { index = i; break; } } if(index == -1) { System.out.println("没有 "+name+"这本书!"); return; } for (int i = index; i < bookList.getUsedSize()-1; i++) { Book book = bookList.getPos(i+1); bookList.setBooks(book,i); } //删除的书,要置空 bookList.setBooks(null, bookList.getUsedSize()-1); bookList.setUsedSize(bookList.getUsedSize()-1); } }5. DisplayOperation書籍の表示:
package operations; import book.Book; import book.BookList; public class DisplayOperation implements IOperation{ @Override public 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); } } }6.ExitOperation書籍の終了:
package operations; import book.BookList; public class ExitOperation implements IOperation{ @Override public void work(BookList bookList) { System.out.println("退出系统! "); System.exit(0); } }7.FindOperation本の検索:
package operations; import book.Book; import book.BookList; import java.util.Scanner; public class FindOperation implements IOperation{ @Override public void work(BookList bookList) { //查找图书 System.out.println("查找图书! "); System.out.println("请输入要查找的图书: "); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); for (int i = 0; i < bookList.getUsedSize(); i++) { Book book = bookList.getPos(i); if(name.equals(book.getName())) { System.out.println("找到了! "); System.out.println(book); return; } } System.out.println("没有这本书! "); } }8.ReturnOperation本の返却:
package operations; import book.Book; import book.BookList; import java.util.Scanner; public class ReturnOperation implements IOperation{ @Override public void work(BookList bookList) { System.out.println("归还图书! "); System.out.println("请输入要归还的图书的名字: "); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); for (int i = 0; i < bookList.getUsedSize(); i++) { Book book = bookList.getPos(i); if(name.equals(book.getName())) { book.setBorrowed(false); System.out.println("归还图书成功! "); return; } } System.out.println("没有你要归还的书! "); } }
以上がJava コードを使用してライブラリ管理システムを実装する方法の詳細内容です。詳細については、PHP 中国語 Web サイトの他の関連記事を参照してください。