做室内设计的网站有哪些,软件开发者工具,网站建设投标ppt,网站外包一般多少钱啊首先我们大概了解下图书系统的需求 1.要有两种身份 管理员和普通用户。普通用户和管理员分别对应的功能不一样#xff0c;需要分开实现
2. 图书系统肯定要有图书#xff0c;和存放图书的地方#xff0c;存放就用数组来实现
3.实现对应用户的功能 接下来我们第一步#xf…首先我们大概了解下图书系统的需求 1.要有两种身份 管理员和普通用户。普通用户和管理员分别对应的功能不一样需要分开实现
2. 图书系统肯定要有图书和存放图书的地方存放就用数组来实现
3.实现对应用户的功能 接下来我们第一步
首先创建一个book的包里面存放图书类和存放图书的列表
在图书类中我们要有图书的属性我们这边简易版只有图书名作者类型价格和图书状态借出未被借出 因为是自己使用为了安全性使用private修饰然后构造getset方法来进行set值和get值在构造一个toString方法方便后面来打印还有一个带参数的构造方法方便后面进行新建图书 接下来实现存放图书
首先需要创建一个数组来存放书还需要记录当前书的数量然后我们可以给数组一个默认的长度和初始化图书在初始化时就有几本默认的书我们需要一个通过下标获取到数组中的书 图书的定义初始化和存放做完后我们来实现用户
用户分为管理员用户和普通用户管理员用户和普通用户都是用户我们就可以定义一个父类User类然后字类AdminUser和NormalUser来继承父类中共有的方法
父类中定义姓名然后创建一个User的构造方法doOperation方法后面会讲到 现在我们要创建我们要实现功能的类因为每个类都要使用work(BookList bookList)的方法我们封装一个接口给其他功能类使用 然后逐次创建继承IOPeration接口创建完后我们来实现主函数
主函数里要定义一个登陆方法然后返回用户给系统 因为登陆函数返回了用户我们主函数调用登陆方法第一步知道是进入哪个用户然后通过choice来决定调用的是哪个方法doOperation这个方法在上面已经实现传入choice和书的列表choice则是通过在普通用户类和管理员用户类中的menu()方法然后输入通过choice来接收传给了doOperation方法根据choice选择对应的方法
接下来我们挨个实现展示图书查找图书新增图书归还图书借阅图书退出图书系统删除图书的各项功能。
展示图书 查找图书 新增图书 借阅图书 删除图书 退出系统 归还图书 接下来我给完整版代码
Book类
package book;/*** author xiaofan* version 1.0* date 2023/11/14 21:49*/
public class Book {private String name;private String author;private String type;private int price;private boolean isBorrowed;Overridepublic String toString() {return Book{ name name \ , author author \ , type type \ , price price \((isBorrowed true) ? 已经借出 : 未被借出)};}public Book(String name, String author, String type, int price) {this.name name;this.author author;this.type type;this.price price;}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 String getType() {return type;}public void setType(String type) {this.type type;}public int getPrice() {return price;}public void setPrice(int price) {this.price price;}public boolean isBorrowed() {return isBorrowed;}public void setBorrowed(boolean borrowed) {isBorrowed borrowed;}
}BookList类
package book;/*** author xiaofan* version 1.0* date 2023/11/14 21:49*/
public class BookList {private Book[] books; //数组来存放书private int usedSize; //记录当前书架上 实际存放的书的数量//默认容量private static final int DEFAULT_CAPACITY 10;public BookList(){this.books new Book[DEFAULT_CAPACITY];//放好书this.books[0] new Book(三国演义,罗贯中,小说,10);this.books[1] new Book(西游记,吴承恩,小说,120);this.books[2] new Book(红楼梦,曹雪芹,小说,110);this.books[3] new Book(斗破苍穹,天蚕土豆,小说,20);this.usedSize 4;}public int getUsedSize() {return usedSize;}public void setUsedSize(int usedSize) {this.usedSize usedSize;}//获取数组某一个下标的书public Book getBook(int pos){
// if (pos 0){
// return books[pos];
// } else {
// System.out.println(下标错误);
// //return new Exception();
// //throw new Exception(下标错误); //抛出异常
// }return books[pos];}//通过数组的下标的位置来放书public void setBooks(int pos,Book book){books[pos] book;}public Book[] getBooks() {return books;}
}User类
package user;import book.BookList;
import operation.IOPeration;/*** author xiaofan* version 1.0* date 2023/11/14 22:12*/
public abstract class User {protected String name;//定义一个存放方法的数组protected IOPeration[] ioPerations;public User(String name){this.name name;}public abstract int menu();//通过传入choice来判断调用的方法public void doOperation(int choice, BookList bookList) {ioPerations[choice].work(bookList);}
}AdminUser类
package user;import operation.*;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 22:14*/
public class AdminUser extends User{public AdminUser(String name) {super(name);this.ioPerations new IOPeration[]{new ExitOperation(),new FindOperation(),new AddOperation(),new DelOperation(),new ShowOperation()};}public int menu(){System.out.println(******管理员用户*******);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);System.out.println(请输入你的操作);int choice scanner.nextInt();return choice;}
}NormalUser类
package user;import operation.*;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 22:14*/
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********);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(*************);Scanner scanner new Scanner(System.in);System.out.println(请输入你的操作);int choice scanner.nextInt();return choice;}
}主函数
import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 23:18*/
public class Main {public static User login(){System.out.println(请输入用户名);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){//管理员return new AdminUser(name);} else{//普通用户return new NormalUser(name);}}public static void main(String[] args) {BookList bookList new BookList();//user 指向哪个对象看返回值是什么User user login();while (true){int choice user.menu();//System.out.println(choice: choice);//根据choice的选择来决定调用的是哪个方法user.doOperation(choice,bookList);}}
}接口
IOPeration
package operation;import book.BookList;/*** author xiaofan* version 1.0* date 2023/11/14 22:06*/
public interface IOPeration {void work(BookList bookList);
}功能实现类
AddOperation
package operation;import book.Book;
import book.BookList;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 22:02*/
public class AddOperation implements IOPeration{Overridepublic void work(BookList bookList) {//System.out.println(新增图书);Scanner scanner new Scanner(System.in);System.out.println(请输入要添加的书名);String name scanner.nextLine();System.out.println(请输书名的作者);String author scanner.nextLine();System.out.println(请输入要添加书的类型);String type scanner.nextLine();System.out.println(请输入书的价格);int price scanner.nextInt();Book book new Book(name,author,type,price);//检查数组当中有没有这本书int currentSize bookList.getUsedSize();for (int i 0; i currentSize; i) {Book book1 bookList.getBook(i);if (book1.getName().equals(name)){System.out.println(有相同的书了不进行存放);return;}}if (currentSize bookList.getBooks().length){System.out.println(图书已经被放满不能放了);} else {//将书放在下标的最后一个位置bookList.setBooks(currentSize,book);//将书的数量加1bookList.setUsedSize(currentSize1);}System.out.println(新增成功);}
}BorrowOperation
package operation;import book.Book;
import book.BookList;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 22:04*/
public class BorrowOperation implements IOPeration{Overridepublic void work(BookList bookList) {//System.out.println(借阅图书);Scanner scanner new Scanner(System.in);System.out.println(请输入你要借阅的书名);String name scanner.nextLine();int curredSize bookList.getUsedSize();int i 0;for (; i curredSize; i) {Book book bookList.getBook(i);if (book.getName().equals(name)){if (book.isBorrowed() false){book.setBorrowed(true);System.out.println(借阅成功);System.out.println(book);return;} else {System.out.println(图书已被借阅不能再次借出);return;}}}System.out.println(你借阅的图书不存在);}
}DelOperation
package operation;import book.Book;
import book.BookList;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 22:02*/
public class DelOperation implements IOPeration {Overridepublic void work(BookList bookList) {//System.out.println(删除图书);Scanner scanner new Scanner(System.in);System.out.println(请输入要删除的书名);String name scanner.nextLine();int pos -1;int i 0;int currentSize bookList.getUsedSize();for (; i currentSize; i) {Book book bookList.getBook(i);if (book.getName().equals(name)){pos i;break;}}if (i currentSize){System.out.println(没有你要删除的图书);return;}//开始删除int j pos;for (; j currentSize-1 ; j) {Book book bookList.getBook(j1);bookList.setBooks(j,book);}//将j置为空bookList.setBooks(j,null);//将书的数量减1bookList.setUsedSize(currentSize-1);System.out.println(删除成功);}
}ExitOperation
package operation;import book.BookList;/*** author xiaofan* version 1.0* date 2023/11/14 22:03*/
public class ExitOperation implements IOPeration{Overridepublic void work(BookList bookList) {System.out.println(退出图书系统);System.exit(0);}
}FindOperation
package operation;import book.Book;
import book.BookList;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 22:02*/
public class FindOperation implements IOPeration{Overridepublic void work(BookList bookList) {//System.out.println(查找图书);Scanner scanner new Scanner(System.in);System.out.println(请输入你要查找的书);String name scanner.nextLine();int currentSize bookList.getUsedSize();for (int i 0; i currentSize; i) {Book book bookList.getBook(i);if (book.getName().equals(name)){System.out.println(找到了这本书信息如下);System.out.println(book);return;}}System.out.println(没有找到这本书);}
}ReturnOperation
package operation;import book.Book;
import book.BookList;import java.util.Scanner;/*** author xiaofan* version 1.0* date 2023/11/14 22:04*/
public class ReturnOperation implements IOPeration{Overridepublic void work(BookList bookList) {//System.out.println(归还图书);Scanner scanner new Scanner(System.in);System.out.println(请输入你要归还的书名);String name scanner.nextLine();int curredSize bookList.getUsedSize();int i 0;for (; i curredSize; i) {Book book bookList.getBook(i);if (book.getName().equals(name)){if (book.isBorrowed() true){book.setBorrowed(false);System.out.println(归还成功);System.out.println(book);return;} else {System.out.println(该图书没有被借出无需归还);return;}}}System.out.println(你归还的图书不存在);}
}ShowOperation
package operation;import book.Book;
import book.BookList;/*** author xiaofan* version 1.0* date 2023/11/14 22:03*/
public class ShowOperation implements IOPeration{Overridepublic void work(BookList bookList) {//System.out.println(展示图书);int currentSize bookList.getUsedSize();for (int i 0; i currentSize; i) {Book book bookList.getBook(i);System.out.println(book);}}
}仓库地址Java学习仓库从入门到精通: Java入门学习 - Gitee.com
