public void moreBook(int number) 实现 number 与 book 变量 相加 并且 得到新的 book

时间: 2023-12-24 17:05:04 浏览: 82
假设 `book` 是一个整型变量,你可以使用如下的代码实现 `moreBook` 方法: ``` public void moreBook(int number) { book = book + number; } ``` 或者使用 Java 简写方式: ``` public void moreBook(int number) { book += number; } ``` 这两种方式都会将传入的 `number` 值与 `book` 变量相加,并将结果保存回 `book` 变量中。
相关问题

public void moreBook(int number) 实现 number 与 book 变量 相加 并且 返回 book

可以使用如下代码实现: ``` public int moreBook(int number) { book += number; return book; } ``` 这个方法将传入的参数 `number` 加到变量 `book` 上,并返回变量 `book` 的值。注意,这里假设变量 `book` 是一个类成员变量或全局变量,否则在方法内部修改变量的值没有意义。

public void moreBook(int number) 实现 number 与 book 变量 相加 并且 返回 number

代码实现如下: ``` public int moreBook(int number) { return number + book; } ``` 其中,`number`是传入的参数,`book`是类中的变量。函数的返回值是`number`与`book`相加的结果。
阅读全文

相关推荐

use java language ,In this project you need to write a book lending system for a Library. The system has different roles for registered users. There are two types of user roles: borrower and lender. Write an IUser interface for library users, with the following UML specification: +----------------------------------+ | <<interface>> | | IUser | +----------------------------------+ | + getName(): String | | + getBook(): int | | + moreBook(int number): void | +----------------------------------+ and a User class that implements IUser and has the following UML specification: +-----------------------------------+ | User | +-----------------------------------+ | - name: String | | - book: int | +-----------------------------------+ | + User(String name, int book) | | + getName(): String | | + getBook(): int | | # setBook(int book): void | | + moreBook(int number): void | | + testUser(): void | +-----------------------------------+ The name instance variable indicates the user name. The book instance variable indicates the number of books borrowed by the user. The setBook method changes the number of books borrowed by the user. The setBook method is protected, not public. This means that only subclasses of the User class can use the setBook method. All the other classes in the system cannot use the setBook method, so they cannot change the number of books borrowed by a user. The purpose of the moreBook method is to increase the number of books borrowed or lent by the user (depending on what kind of user it is) by the number given as argument to the method. The moreBook method of the User class is abstract, since we do not know what kind of role the user is (a borrower borrows books from other users and a lender lend books to other users). Also add to your program a Test class to test your User class. public class Test { public static void main(String[] args) { User.testUser(); } }

Also create a ControllerMoreBook class that extends Controller.The moreBook method takes the name of a user and a number of books (as a string) as arguments. The moreBook method of the controller then transforms the number of books from a string to an integer (using the Integer.parseInt static method) and calls the moreBook method of the library to increase the number of books borrowed or lent by the user (depending on what kind of user it is) of a specific user, by the given argument. • If no exception occurs then the moreBook method of the controller returns the empty string. • If the moreBook method of the library throws an UnknownUserException then the moreBook method of the controller must catch this exception and return as result the error message from the exception object. • If the moreBook method of the library throws a NotALenderException then the moreBook method of the controller must catch this exception and return as result the error message from the exception object. • If the parseInt method of the Integer class throws a NumberFormatException (because the user typed something which is not an integer) then the moreBook method of the controller must catch this exception and return as result the error message from the exception object. Note: to keep things simple, it is allowed for a user of your system to increase the number of books of a user by a negative number, so there is no need to check for that. Modify the run method of the GUI class to add a ViewMoreBook view that uses a ControllerMoreBook controller and the same model as before (not a new model!) Do not delete the previous views. Run your GUI and check that you can correctly use the new view to increase the number of books for different users of your library (obviously your library must have some users in it to test this: see the last paragraph of Question 7). • Check that, when you increase a user’s book, the simple view is automatically correctly updated to show the new total number of borrowed books for all users of the library. • Also use the “get book” view to check that the user’s book value correctly changed. • Also check that increasing the book number of an unknown user correctly shows an error message.Also check that increasing the book of a user by a large negative number correctly shows an error message. Also check that trying to increase the book of a user by a number which is not an integer correctly shows an error message (do not worry about the content of the error message). 完成符合以上要求的java代码

continue to use Java language, Add a class Borrower that extends User. The constructor of the Borrower class takes a name and a number of books borrowed by the borrower. If the number of books given as argument is strictly less than zero, then the constructor must throw a NotALenderException with the message “A new borrower cannot lend books.”. The borrower class does not have any instance variable. The moreBook method of the Borrower class increases the number of books borrowed by the borrower by the number of books given as argument to the method (so the books borrowed by the borrower becomes more positive!) For example, if a borrower currently borrows 10 books and moreBook(2) is called then the borrower borrows 12 books. It is fine for the moreBook method to be given a negative value as argument, which means the borrower then just returned some books. For example, if a borrower currently borrows 10 books and moreBook(-2) is called then the borrower borrows 8 books. However, a borrower cannot lend books, so the number of books borrowed by the borrower must always be positive or zero, never negative. If the argument given to the moreBook method is too negative and would change the book variable into a negative value, then the number of books borrowed by the borrower must not change and the moreBook method must throw a NotALenderException with the message “A borrower cannot lend XXX book(s).”, where XXX is replaced with the result of -(book + number). For example, if a borrower currently borrows 10 books and moreBook(-12) is called then the borrower still borrows 10 books and the method throws a NotALenderException with the message “A borrower cannot lend 2 book(s).”. Note: to simplify the project, do not worry about the setBook method. Change other classes and interfaces as necessary

Add a Library class with the following UML specification: +-------------------------------------------+ | Library | +-------------------------------------------+ | - name: String | | - users: ArrayList | +-------------------------------------------+ | + Library(String name) | | + addUser(IUser user): void | | + totalBorrowedBooks(): int | | + getBook(String name): int | | + moreBook(String name, int number): void | | + testLibrary(): void | +-------------------------------------------+ When a library is created, it has an arraylist of users (IUser) but the arraylist is empty (the arraylist does not contain any user). The addUser method takes a user (IUser) as argument and adds the user to the arraylist of users for the library. The totalBorrowedBooks method returns as result the total number of books borrowed by all users of the library (the result can be either positive or negative). The getBook method takes as argument the name of a user and returns as result the number of books currently borrowed by the user. If the library does not have a user with the given name, then the getBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. You can assume all user names are unique in the arraylist. The moreBook method takes as argument the name of a user and a number of books and changes the number of books currently borrowed by that user. If the library does not have a user with the given name, then the moreBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. Note: the moreBook method does not catch any exception, it only throws exceptions. Hint: use the equals method to compare strings, not the == operator which only works with constant strings. 写java文件

continue to use Java language, Add a Library class with the following UML specification: +-------------------------------------------+ | Library | +-------------------------------------------+ | - name: String | | - users: ArrayList<IUser> | +-------------------------------------------+ | + Library(String name) | | + addUser(IUser user): void | | + totalBorrowedBooks(): int | | + getBook(String name): int | | + moreBook(String name, int number): void | | + testLibrary(): void | +-------------------------------------------+ When a library is created, it has an arraylist of users (IUser) but the arraylist is empty (the arraylist does not contain any user). The addUser method takes a user (IUser) as argument and adds the user to the arraylist of users for the library. The totalBorrowedBooks method returns as result the total number of books borrowed by all users of the library (the result can be either positive or negative). The getBook method takes as argument the name of a user and returns as result the number of books currently borrowed by the user. If the library does not have a user with the given name, then the getBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. You can assume all user names are unique in the arraylist. The moreBook method takes as argument the name of a user and a number of books and changes the number of books currently borrowed by that user. If the library does not have a user with the given name, then the moreBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. Note: the moreBook method does not catch any exception, it only throws exceptions. Hint: use the equals method to compare strings, not the == operator which only works with constant strings.

帮我修改一下我的代码错误:帮我看看我这段代码有什么错误:int choice = readPosInt("Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): "); // Perform the selected action while (choice != 6) { switch (choice) { case 1: System.out.println("Total number of borrowed books: " + Library.totalBorrowedBooks(null)); break; case 2: System.out.print("Type the user role (lender:1 borrower:2): "); int role = readPosInt(null); if (role == 1) { System.out.print("Enter the name of the user: "); String name = readLine(name); System.out.print("Enter the initial number of lent books: "); int numBooks = readPosInt(null); Lender lender = new Lender(name, numBooks); Library.addUser(lender); System.out.println("Lender "" + name + "" lending " + numBooks + " book(s) has been added."); } else if (role == 2) { System.out.print("Enter the name of the user: "); String name = readLine(name); System.out.print("Enter the initial number of borrowed books: "); int numBooks = readPosInt(null); Borrower borrower = new Borrower(name, numBooks); Library.addUser(borrower); System.out.println("Borrower "" + name + "" borrowing " + numBooks + " book(s) has been added."); } else { System.out.println("Unknown user role!"); } break; case 3: System.out.print("Enter the name of the user: "); String username = input.nextLine(); try { int numBorrowed = Library.totalBorrowedBooks(username); System.out.println(username + " borrows " + numBorrowed + " book(s)."); } catch (UnknownUserException e) { System.out.println("User " + username + " unknown."); } break; case 4: try { System.out.print("Enter the name of the user: "); String name = input.nextLine(); System.out.print("Enter the number of books: "); int num = input.nextInt(); input.nextLine(); library.moreBook(username, role); } catch (UnknownUserException e) { System.out.println("User " + username + " unknown."); } break; case 5: System.out.print("Enter the name of the user: "); username = input.next(); System.out.print("Enter the number of books: "); int numBooks = input.nextInt(); library.moreBook(username, -numBooks); // simulate decreasing books break; case 6: System.out.println("Goodbye!"); System.exit(0); break; }

zip

最新推荐

recommend-type

基于局部优化的电动汽车充放电策略优化:MATLAB+CVX平台下的调度模型与效果分析,基于局部优化的电动汽车大规模随机充放电策略优化方案-对比均衡负载与全局优化法,实现运行成本最小化与高效出图效果

基于局部优化的电动汽车充放电策略优化:MATLAB+CVX平台下的调度模型与效果分析,基于局部优化的电动汽车大规模随机充放电策略优化方案——对比均衡负载与全局优化法,实现运行成本最小化与高效出图效果。,MATLAB代码:基于局部优化的大规模电动汽车随机充放电策略优化 关键词:电动汽车充放电优化 电动汽车 局部优化 充放电策略 参考文档:《Optimal Scheduling for Charging and Discharging of Electric Vehicles》完全复现 仿真平台:MATLAB+CVX平台 主要内容:代码主要做的是电动汽车充放电优化策略管理,为解决大规模电动汽车调度问题带来的复杂求解难度,提出了一种基于局部优化的快速优化方法,并横向对比了三种方法,即均衡负载法、局部优化法以及全局优化法,电动汽车的调度模型考虑了大量人口以及电动汽车的随机达到分布式调度模型,调度的目标函数为电动汽车充放电管理的运行成本最小化,更加创新,而且求解的效果更好,出图效果十分完美 可以直接拿过去用 ,电动汽车; 局部优化; 充放电策略优化; 随机充放电; 分布式调度模型; 运行成本
recommend-type

基于PLC控制的加工站与包装站间传送系统电气控制设计研究,PLC在加工传送包装站中的电气控制系统设计与应用,基于plc加工站传送包装站控制系统设计加工传送包装站电气控制 ,核心关键词:PLC加工站

基于PLC控制的加工站与包装站间传送系统电气控制设计研究,PLC在加工传送包装站中的电气控制系统设计与应用,基于plc加工站传送包装站控制系统设计加工传送包装站电气控制 ,核心关键词:PLC加工站; 传送; 包装站; 控制系统设计; 电气控制。,基于PLC的加工站与包装站控制系统设计与电气控制
recommend-type

2012年必应壁纸.rar

2012年必应壁纸
recommend-type

Zotero 重复合并 v1.1.5

来自GITHUB作者frangoud的文档合并删除插件,适用于Zotero。原下载网站网速较慢,提供一个下载链接 使用方法: 1.下载zotero 重复条目合并文件。 2.在Zotero中点击工具-附加组件,齿轮处选择 install Add-on from file...。 3.找到下载文件中的ZoteroDuplicatesMerger-v1.1.5.xpi并双击。 4.双击install now。 5.重启以确认安装。 插件原下载位置:https://github.com/frangoud/ZoteroDuplicatesMerger
recommend-type

基于DDS技术的FPGA信号发生器波形仿真:用Verilog语言实现正弦波、方波、锯齿波及三角波的组合生成,基于DDS技术的FPGA信号发生器波形仿真:Verilog语言实现正弦波、方波等四种波形及其

基于DDS技术的FPGA信号发生器波形仿真:用Verilog语言实现正弦波、方波、锯齿波及三角波的组合生成,基于DDS技术的FPGA信号发生器波形仿真:Verilog语言实现正弦波、方波等四种波形及其线性组合生成,FPGA仿真,Verilog语言。 基于DDS技术的信号发生器波形仿真,能产生正弦波方波锯齿波三角波以及四种波形的线性组合。 ,FPGA仿真; Verilog语言; DDS技术; 信号发生器; 正弦波; 方波; 锯齿波; 三角波; 波形组合。,FPGA实现DDS技术:Verilog编程的信号发生器波形仿真
recommend-type

Python书籍图片变形软件与直纹表面模型构建

从给定的文件信息中,我们可以提取出几个核心知识点来详细介绍。以下是详细的知识点说明: ### 标题知识点 1. **书籍图片图像变形技术**:“book-picture-dewarping”这个名字直译为“书本图片矫正”,这说明该软件的目的是通过技术手段纠正书籍拍摄时产生的扭曲变形。这种扭曲可能由于拍摄角度、书本弯曲或者页面反光等原因造成。 2. **直纹表面模型构建**:直纹表面模型是指通过在两个给定的曲线上定义一系列点,而这些点定义了一个平滑的曲面。在图像处理中,直纹表面模型可以被用来模拟和重建书本页面的3D形状,从而进一步进行图像矫正。 ### 描述知识点 1. **软件使用场景与历史**:描述中提到软件是在2011年在Google实习期间开发的,说明了该软件有一定的历史背景,并且技术成形的时间较早。 2. **代码与数据可用性**:虽然代码是免费提供的,但开发时所使用的数据并不共享,这表明代码的使用和进一步开发可能会受到限制。 3. **项目的局限性与发展方向**:作者指出原始项目的结构和实用性存在不足,这可能指的是软件的功能不够完善或者用户界面不够友好。同时,作者也提到在技术上的新尝试,即直接从图像中提取文本并进行变形,而不再依赖额外数据,如3D点。这表明项目的演进方向是朝着更自动化的图像处理技术发展。 4. **项目的未公开状态**:尽管作者在新的方向上有所进展,但目前这个新方法还没有公开,这可能意味着该技术还处于研究阶段或者需要进一步的开发和验证。 ### 标签知识点 1. **Python编程语言**:标签“Python”表明该软件的开发语言为Python。Python是一种广泛使用的高级编程语言,它因其简洁的语法和强大的库支持,在数据处理、机器学习、科学计算和Web开发等领域非常受欢迎。Python也拥有很多图像处理相关的库,比如OpenCV、PIL等,这些工具可以用于开发图像变形相关的功能。 ### 压缩包子文件知识点 1. **文件名称结构**:文件名为“book-picture-dewarping-master”,这表明代码被组织为一个项目仓库,通常在Git版本控制系统中,以“master”命名的文件夹代表主分支。这意味着,用户可以期望找到一个较为稳定且可能包含多个版本的项目代码。 2. **项目组织结构**:通常在这样的命名下,用户可能会找到项目的基本文件,包括代码文件(如.py)、文档说明(如README.md)、依赖管理文件(如requirements.txt)和版本控制信息(如.gitignore)。此外,用户还可以预见到可能存在的数据文件夹、测试脚本以及构建脚本等。 通过以上知识点的阐述,我们可以看出该软件项目的起源背景、技术目标、目前状态以及未来的发展方向。同时,对Python语言在该领域的应用有了一个基础性的了解。此外,我们也可以了解到该软件项目在代码结构和版本控制上的组织方式。对于希望进一步了解和使用该技术的开发者来说,这些信息是十分有价值的。
recommend-type

Python环境监控高可用构建:可靠性增强的策略

# 1. Python环境监控高可用构建概述 在构建Python环境监控系统时,确保系统的高可用性是至关重要的。监控系统不仅要在系统正常运行时提供实时的性能指标,而且在出现故障或性能瓶颈时,能够迅速响应并采取措施,避免业务中断。高可用监控系统的设计需要综合考虑监控范围、系统架构、工具选型等多个方面,以达到对资源消耗最小化、数据准确性和响应速度最优化的目
recommend-type

DeepSeek-R1-Distill-Qwen-7B-F16.gguf解读相关参数

### DeepSeek-R1-Distill-Qwen-7B-F16.gguf 模型文件参数解释 #### 模型名称解析 `DeepSeek-R1-Distill-Qwen-7B-F16.gguf` 是一个特定版本的预训练语言模型。其中各个部分含义如下: - `DeepSeek`: 表明该模型由DeepSeek团队开发或优化[^1]。 - `R1`: 版本号,表示这是第一个主要版本[^2]。 - `Distill`: 提示这是一个蒸馏版模型,意味着通过知识蒸馏技术从更大更复杂的教师模型中提取关键特征并应用于较小的学生模型上[^3]。 - `Qwen-7B`: 基础架构基于Qwen系列中的
recommend-type

H5图片上传插件:个人资料排名第二的优质选择

标题中提到的“h5图片上传插件”指的是为HTML5开发的网页图片上传功能模块。由于文件描述中提到“个人资料中排名第二”,我们可以推断该插件在某个平台或社区(例如GitHub)上有排名,且表现不错,获得了用户的认可。这通常意味着该插件具有良好的用户界面、高效稳定的功能,以及容易集成的特点。结合标签“图片上传插件”,我们可以围绕HTML5中图片上传的功能、实现方式、用户体验优化等方面展开讨论。 首先,HTML5作为一个开放的网页标准技术,为网页提供了更加丰富的功能,包括支持音频、视频、图形、动画等多媒体内容的直接嵌入,以及通过Canvas API和SVG提供图形绘制能力。其中,表单元素的增强使得Web应用能够支持更加复杂的文件上传功能,尤其是在图片上传领域,这是提升用户体验的关键点之一。 图片上传通常涉及以下几个关键技术点: 1. 表单元素(Form):在HTML5中,表单元素得到了增强,特别是`<input>`元素可以指定`type="file"`,用于文件选择。`accept`属性可以限制用户可以选择的文件类型,比如`accept="image/*"`表示只接受图片文件。 2. 文件API(File API):HTML5的File API允许JavaScript访问用户系统上文件的信息。它提供了`File`和`Blob`对象,可以获取文件大小、文件类型等信息。这对于前端上传图片前的校验非常有用。 3. 拖放API(Drag and Drop API):通过HTML5的拖放API,开发者可以实现拖放上传的功能,这提供了更加直观和便捷的用户体验。 4. XMLHttpRequest Level 2:在HTML5中,XMLHttpRequest被扩展为支持更多的功能,比如可以使用`FormData`对象将表单数据以键值对的形式发送到服务器。这对于文件上传也是必须的。 5. Canvas API和Image API:上传图片后,用户可能希望对图片进行预览或编辑。HTML5的Canvas API允许在网页上绘制图形和处理图像,而Image API提供了图片加载后的处理和显示机制。 在实现h5图片上传插件时,开发者通常会考虑以下几个方面来优化用户体验: - 用户友好性:提供清晰的指示和反馈,比如上传进度提示、成功或失败状态的提示。 - 跨浏览器兼容性:确保插件能够在不同的浏览器和设备上正常工作。 - 文件大小和格式限制:根据业务需求对用户上传的图片大小和格式进行限制,确保上传的图片符合预期要求。 - 安全性:在上传过程中对文件进行安全检查,比如防止恶意文件上传。 - 上传效率:优化上传过程中的性能,比如通过分片上传来应对大文件上传,或通过Ajax上传以避免页面刷新。 基于以上知识点,我们可以推断该“h5图片上传插件”可能具备了上述的大部分特点,并且具有易用性、性能和安全性上的优化,这使得它在众多同类插件中脱颖而出。 考虑到文件名列表中的“html5upload”,这可能是该插件的项目名称、文件名或是一部分代码命名。开发者或许会使用该命名来组织相关的HTML、JavaScript和CSS文件,从而使得该插件的结构清晰,便于其他开发者阅读和集成。 综上所述,“h5图片上传插件”是一个利用HTML5技术实现的、功能完善且具有优良用户体验的图片上传组件。开发者可以使用该插件来提升网站或Web应用的互动性和功能性,尤其在处理图片上传这种常见的Web功能时。
recommend-type

Python环境监控性能监控与调优:专家级技巧全集

# 1. Python环境性能监控概述 在当今这个数据驱动的时代,随着应用程序变得越来越复杂和高性能化,对系统性能的监控和优化变得至关重要。Python作为一种广泛应用的编程语言,其环境性能监控不仅能够帮助我们了解程序运行状态,还能及时发现潜在的性能瓶颈,预防系统故障。本章将概述Python环境性能监控的重要性,提供一个整体框架,以及为后续章节中深入探讨各个监控技术打