【Java项目】小练习

2023-04-23 08:39| 来源: 网络整理| 查看: 265

今天我们来练习一个小项目：图书管理系统我们先来看一下这个项目的运行效果：使用者分为管理员和普通用户。

我们先来看一下普通用户的操作：

我们再来看一下管理员的操作：

接下来我们一起来看一下这个程序的代码：

图书管理系统bookBookpackage book; public class Book { private String name; private String author; private int price; private String type; private boolean isBorrowed; 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)? "该书已经借出":"该书未借出")+ '}'; } }BookListpackage book; public class BookList { private Book[] books = new Book[10]; private int usedSize;//储存当前书的个数 public BookList(){ books[0] = new Book("三体地球往事","刘慈欣",33,"小说"); books[1] = new Book("三体黑暗森林","刘慈欣",34,"小说"); books[2] = new Book("三体死神永生","刘慈欣",35,"小说"); this.usedSize = 3; } public int getUsedSize() { return usedSize; } public void setUsedSize(int usedSize) { this.usedSize = usedSize; } public Book getPos(int pos){ return books[pos]; } public void setBooks(Book book,int pos){ books[pos] = book; } }operationsAddOPerationpackage operations; import book.Book; import book.BookList; import java.util.Scanner; public class AddOperation implements IOPeration{ public void work(BookList bookList){ System.out.println("新增图书！"); System.out.println("请输入你要新增的图书的名字："); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); System.out.println("请输入你要新增图书的作者："); String author = scanner.nextLine(); System.out.println("请输入你要新增图书的价格："); int price = scanner.nextInt(); scanner.nextLine();//读入回车 System.out.println("请输入你要新增图书的类型："); String type = scanner.nextLine(); Book book = new Book(name,author,price,type); //1.获取当前可以存放的书籍 int currentSize = bookList.getUsedSize(); //2.把书放在指定位置 bookList.setBooks(book,currentSize); //书的有效个数 bookList.setUsedSize(currentSize+1); } }BorrowOperationpackage operations; import book.Book; import book.BookList; import java.util.Scanner; public class BorrowOperation implements IOPeration{ public void work(BookList bookList){ System.out.println("借阅图书！"); System.out.println("请输入你要借阅书籍的名字："); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); int currentSize = bookList.getUsedSize(); for (int i = 0; i < currentSize; 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！"); } }DelOperationpackage operations; import book.Book; import book.BookList; import java.util.Scanner; public class DelOperation implements IOPeration{ 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(); //1.遍历数组当中是否有你要删除的书，有记录下标 int index = -1; int currentSize = bookList.getUsedSize(); for (int i = 0; i < currentSize; i++) { Book book = bookList.getPos(i); if(name.equals(book.getName())){ index = i; break; } } if(index == -1){ System.out.println("没有你要删除的书！"); return; } for (int i = index; i < currentSize-1; i++) { Book book = bookList.getPos(i+1); bookList.setBooks(book,i); } bookList.setBooks(null,currentSize-1); bookList.setUsedSize(currentSize-1); System.out.println("删除成功！"); } }DisplayOperationpackage operations; import book.Book; import book.BookList; public class DisplayOperation implements IOPeration{ public void work(BookList bookList){ System.out.println("显示所有图书！"); int currentSize = bookList.getUsedSize(); for (int i = 0; i < currentSize; i++) { Book book = bookList.getPos(i); System.out.println(book); } } }ExitOperationpackage 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); } }FindOperationpackage operations; import book.Book; import book.BookList; import java.util.Scanner; public class FindOperation implements IOPeration{ @Override public 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 currentSize = bookList.getUsedSize(); for (int i = 0; i < currentSize; i++) { Book book = bookList.getPos(i); if(name.equals(book.getName())){ System.out.println("找到了这本书！"); System.out.println(book); return; } } System.out.println("没有这本书！"); } }IOPerationpackage operations; import book.BookList; public interface IOPeration { void work(BookList bookList); }ReturnOperationpackage 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("请输入你要归还图书的名字："); Scanner scanner = new Scanner(System.in); String name = scanner.nextLine(); int currentSize = bookList.getUsedSize(); for (int i = 0; i < currentSize; 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("没有你要归还的图书！"); } }userAdminerUserpackage user; import operations.*; import java.util.Scanner; public class AdminerUser extends User{ public AdminerUser(String name){ super(name); this.ioPerations = new IOPeration[]{ new ExitOperation(), new FindOperation(), new AddOperation(), new DelOperation(), new DisplayOperation() }; } public int menu(){ System.out.println("**************************************"); System.out.println("hello "+name+ "欢迎来到图书管理系统！"); 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("**************************************"); System.out.println("请输入你的操作："); Scanner scanner = new Scanner(System.in); int choic = scanner.nextInt(); return choic; } }NormalUserpackage 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("**************************************"); System.out.println("hello "+name+ "欢迎来到图书管理系统！"); 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.退出系统"); System.out.println("**************************************"); System.out.println("请输入你的操作："); Scanner scanner = new Scanner(System.in); int choic = scanner.nextInt(); return choic; } }Userpackage user; import book.BookList; import operations.IOPeration; public abstract class User { protected String name; protected IOPeration[] ioPerations; public User(String name){ this.name = name; } public abstract int menu(); public void doOperation(int choic, BookList bookList){ ioPerations[choic].work(bookList); } }Mainimport book.BookList; import user.AdminerUser; import user.NormalUser; import user.User; import java.util.Scanner; public class Main { 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 0-》普通用户"); int choic = scanner.nextInt(); //根据用户输入的数字判断身份发生向上转型 if(choic == 1){ return new AdminerUser(userName); }else{ return new NormalUser(userName); } } public static void main(String[] args) { //0.准备数据 BookList bookList = new BookList(); //1.登录 User user = login(); while (true){ int choic = user.menu(); user.doOperation(choic,bookList); } } }

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